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1. "Click" chemistry for in situ formation of thermoresponsive P(NIPAAm-co-HEMA)-based hydrogels

Author:
Xu, Xiao-Ding; Chen, Chang-Sheng; Wang, Zong-Chun; Wang, Gan-Rui; Cheng, Si-Xue; Zhang, Xian-Zheng; Zhuo, Ren-Xi
Source:
Journal of polymer science 2008 v.46 no.15 pp. 5263-5277
ISSN:
0887-624X
Subject:
alkynes; catalysts; copper; crosslinking; gelation; hydrocolloids; polymers; temperature
Abstract:
... The strategy for in situ chemical gelation of poly(N-isopropylacrylamide-co-hydroxylethyl methacrylate) [P(NIPAAm-co-HEMA)]-based polymers was demonstrated. Two types of new P(NIPAAm-co-HEMA) derivatives with alkyne and azide pendant groups, respectively, were prepared. When the solutions of the two derivatives were mixed together, a crosslinking reaction, a type of Huisgen's 1,3-dipolar azide-alk ...
DOI:
10.1002/pola.22857

2. "Living" radical polymerization of styrene catalyzed by cyclometalated ruthenium(II) complexes bearing nonlabile ligands

Author:
Aguilar-Lugo, C.; Le Lagadec, R.; Ryabov, Alexander D.; Valverde, G. Cedillo; Morales, S. Lopez; Alexandrova, L.
Source:
Journal of polymer science 2009 v.47 no.15 pp. 3814-3828
ISSN:
0887-624X
Subject:
aluminum; catalysts; catalytic activity; ligands; osmium; polymerization; polymers; redox potential; ruthenium; styrene
Abstract:
... Cationic substitutionally inert cyclometalated ruthenium (II) and osmium (II) complexes, ([Mt(o-C₆H₄-2-py)(LL)₂]PF₆), where LL-1,10-phenanthroline (phen) or 2,2'-bipyridine (bipy), were used for radical polymerization of styrene. Gradual modification of the complexes within the series allowed comparison of the catalytic activity and the redox properties. There was no correlation between the reduci ...
DOI:
10.1002/pola.23445

3. (0D/3D) MoS2 on porous graphene as catalysts for enhanced electrochemical hydrogen evolution

Author:
Yizhe Liu; Yuanzhi Zhu; Xiaobin Fan; Shaobin Wang; Yang Li; Fengbao Zhang; Guoliang Zhang; Wenchao Peng
Source:
Carbon 2017 v.121 pp. 163-169
ISSN:
0008-6223
Subject:
active sites; carbon dioxide; catalysts; composite materials; electrochemistry; graphene; graphene oxide; hydrogen production; nanoflowers; surface area
Abstract:
... A new composite material consisting of 0D MoS2 nanodots and 3D MoS2 nano-flowers grown on porous reduced graphene oxide (P-rGO) was synthesized via a two-step process. The P-rGO with a surface area of 759 m2 g−1 was obtained by CO2 activation of reduced graphene oxide (rGO) at 800 °C. MoS2 was then grown on the P-rGO under hydrothermal conditions. Compared to the nonactivated rGO, P-rGO has functi ...
DOI:
10.1016/j.carbon.2017.05.092

4. (1,2-Diaminoethane-1,2-diyl)bis(N-methylpyridinium) Salts as a Prospective Platform for Designing Recyclable Prolinamide-Based Organocatalysts

Author:
Lisnyak Vladislav G.; Kucherenko Alexander S.; Valeev Edward F.; Zlotin Sergei G.
Source:
Journal of organic chemistry 2015 v.80 no.19 pp. 9570-9577
ISSN:
1520-6904
Subject:
catalysts; chemical reactions; chemical structure; organic chemistry; organic compounds; salts
Abstract:
... A new efficient and highly recyclable organocatalyst has been developed for asymmetric cross-aldol reactions under neat conditions in ketone–ketone, ketone–aldehyde, and aldehyde–aldehyde systems. The catalyst features two prolinamide fragments and a C₂-symmetrical (1,2-diaminoethane-1,2-diyl)bis(N-methylpyridinium) group. The catalyst retained high activity and excellent stereoselection over the ...
DOI:
10.1021/acs.joc.5b01555

5. (100) surface-exposed CeO₂ nanocubes as an efficient heterogeneous catalyst in the tandem oxidation of benzyl alcohol, para-chlorobenzyl alcohol and toluene to the corresponding aldehydes selectively

Author:
Kalyanjyoti Deori; Chinmoy Kalita; Sasanka Deka
Source:
Journal of materials chemistry A 2015 v.3 no.13 pp. 6909-6920
ISSN:
2050-7496
Subject:
benzaldehyde; benzyl alcohol; catalysts; catalytic activity; ceric oxide; crystal structure; nanocrystals; nanorods; oxidation; oxygen; porosity; surface area; toluene
Abstract:
... A new synthesis strategy has been developed to synthesize exclusively (100)-surface-exposed CeO₂ nanocubes (∼90 nm), formed through three dimensional (3D) self-assembly of smaller ceria nanocrystal building blocks, as an efficient heterogeneous catalyst for multiple selective oxidation reactions. To compare the effect of morphology on catalysis, 1D CeO₂ nanorods have also been tested in parallel. ...
DOI:
10.1039/c4ta06547f

6. (2S,4R)-Hyp-(S)-Phe-OMe dipeptide supported on imidazolium tagged molecules as recoverable organocatalysts for asymmetric aldol reactions using water as reaction medium

Author:
Arturo Obregón-Zúñiga; Eusebio Juaristi
Source:
Tetrahedron 2017 v.73 pp. 5373-5380
ISSN:
0040-4020
Subject:
catalysts; chemical elements; chemical reactions; chemical structure; organic compounds; solvents; stereochemistry
Abstract:
... Four novel chiral imidazolium tagged molecules derived from dipeptide (2S,4R)-Hyp-(S)-Phe-OMe were prepared and evaluated as organocatalysts in the asymmetric aldol reaction using water as solvent. It was found that catalysts incorporating the hexanoyl linker are active down to 5 mol% and afford aldol products with up to 94% yield, up to 98:2 dr and up to 97:3 er. This chiral imidazolium catalyst ...
DOI:
10.1016/j.tet.2017.07.037

7. (Ar-tpy)Ruᴵᴵ(ACN)₃: A Water-Soluble Catalyst for Aldehyde Amidation, Olefin Oxo-Scissoring, and Alkyne Oxygenation

Author:
Dripta De Joarder; Subrata Gayen; Rajarshi Sarkar; Rajarshi Bhattacharya; Sima Roy; Dilip K. Maiti
Source:
Journal of organic chemistry 2019 v.84 no.13 pp. 8468-8480
ISSN:
1520-6904
Subject:
acids; aldehydes; alkynes; amides; carbon-hydrogen bond activation; catalysts; catalytic activity; chemical reactions; chemical structure; ketones; olefin; organic chemistry; ruthenium; water solubility
Abstract:
... The synthetic chemists always look for developing new catalysts, sustainable catalysis, and their applications in various organic transformations. Herein, we report a new class of water-soluble complexes, (Ar-tpy)Ruᴵᴵ(ACN)₃, utilizing designed terpyridines possessing electron-donating and -withdrawing aromatic residues for tuning the catalytic activity of the Ru(II) complex. These complexes displa ...
DOI:
10.1021/acs.joc.9b00487

8. (Arylimido)niobium(V)–Alkylidenes, Nb(CHSiMe₃)(NAr)[OC(CF₃)₃](PMe₃)₂, That Enable to Proceed Living Metathesis Polymerization of Internal Alkynes

Author:
Itsuki Izawa; Kotohiro Nomura
Source:
Macromolecules 2020 v.53 no.13 pp. 5266-5279
ISSN:
1520-5835
Subject:
alkynes; catalysts; niobium; polymerization
Abstract:
... Living polymerizations of internal alkynes (2-hexyne, 3-hexyne, 4-methyl-2-pentyne, and 1-phenyl-1-propyne) have been demonstrated at 50 °C by (arylimido)niobium(V)–alkylidene complex catalysts, Nb(CHSiMe₃)(NAr)[OC(CF₃)₃](PMe₃)₂ [Ar = 2,6-Me₂C₆H₃ (4a), 2-MeC₆H₄ (4c), and 2,6-Cl₂C₆H₃ (4d)], in the presence of PMe₃, which plays an essential role to proceed the living polymerization without certain c ...
DOI:
10.1021/acs.macromol.0c00874

9. (B,N)-Doped 3D porous graphene–CNTs synthesized by chemical vapor deposition as a bi-functional catalyst for ORR and HER

Author:
Pingping Gao; Min Sun; Xiaobo Wu; Shuzhu Zhou; Xiaoting Deng; Zhiyong Xie; Li Xiao; Lihui Jiang; Qizhong Huang
Source:
RSC advances 2018 v.8 no.47 pp. 26934-26937
ISSN:
2046-2069
Subject:
acid tolerance; catalysts; density functional theory; electrochemistry; energy; hydrogen production; nanotubes; vapors
Abstract:
... Novel (B,N)-doped three-dimensional (3D) porous graphene–carbon nanotubes (CNTs) can be used as an excellent alkaline and acid tolerant electrocatalyst for both the oxygen reduction reaction (ORR) and the hydrogen evolution reaction (HER). Based on density functional theory, the H and O atoms’ pre-and post-adsorption energy can effectively reduce the reaction energy barrier. ...
DOI:
10.1039/c8ra04048f

10. (CTA)₃[SiW₁₂]–Li⁺–MMT: a novel, efficient and simple nanocatalyst for facile and one-pot access to diverse and densely functionalized 2-amino-4H-chromene derivatives via an eco-friendly multicomponent reaction in water

Author:
Esmayeel Abbaspour-Gilandeh; Mehraneh Aghaei-Hashjin; Asieh Yahyazadeh; Hadi Salemi
Source:
RSC advances 2016 v.6 no.60 pp. 55444-55462
ISSN:
2046-2069
Subject:
X-ray diffraction; aldehydes; catalysts; chromatography; differential thermal analysis; energy-dispersive X-ray analysis; nanomaterials; scanning electron microscopy; synthesis; thermogravimetry
Abstract:
... A simple, facile and highly efficient one-pot synthesis of a pharmaceutically interesting diverse kind of functionalized 2-amino-4H-chromene by a straightforward three-component reaction of an aromatic aldehyde, malononitrile (or ethyl cyanoacetate) and diverse enolizable C–H activated acidic compounds in the presence of a catalytic amount of (CTA)₃[SiW₁₂]–Li⁺–MMT is reported as a novel, environme ...
DOI:
10.1039/c6ra09818e

11. (Cyclopentadienone)iron-Catalyzed Transfer Dehydrogenation of Symmetrical and Unsymmetrical Diols to Lactones

Author:
Yidan Tang; Rowan I. L. Meador; Casina T. Malinchak; Emily E. Harrison; Kimberly A. McCaskey; Melanie C. Hempel; Timothy W. Funk
Source:
Journal of organic chemistry 2019 v.85 no.4 pp. 1823-1834
ISSN:
1520-6904
Subject:
acetone; carbonyl compounds; carboxylic acids; catalysts; catalytic activity; dehydrogenation; electronics; glycols; hydrogen; iron; lactones; ligands; moieties; organic chemistry; solvents; spectral analysis
Abstract:
... Air-stable iron carbonyl compounds bearing cyclopentadienone ligands with varying substitution were explored as catalysts in dehydrogenative diol lactonization reactions using acetone as both the solvent and hydrogen acceptor. Two catalysts with trimethylsilyl groups in the 2- and 5-positions, [2,5-(SiMe₃)₂-3,4-(CH₂)₄(η⁴-C₄C═O)]Fe(CO)₃ (1) and [2,5-(SiMe₃)₂-3,4-(CH₂)₃(η⁴-C₄C═O)]Fe(CO)₃ (2), were f ...
DOI:
10.1021/acs.joc.9b01884

12. (DiMeIHeptCˡ)Pd: A Low-Load Catalyst for Solvent-Free (Melt) Amination

Author:
Volodymyr Semeniuchenko; Sepideh Sharif; Jonathan Day; Nalin Chandrasoma; William J. Pietro; Jeffrey Manthorpe; Wilfried M. Braje; Michael G. Organ
Source:
Journal of organic chemistry 2021 v.86 no.15 pp. 10343-10359
ISSN:
1520-6904
Subject:
alcohols; amination; aniline; arylation; catalysts; lipophilicity; lubricants; organic chemistry
Abstract:
... (DiMeIHeptCˡ)Pd, a hyper-branched N-aryl Pd NHC catalyst, has been shown to be efficient at performing amine arylation reactions in solvent-free (“melt”) conditions. The highly lipophilic environment of the alkyl chains flanking the Pd center serves as lubricant to allow the complex to navigate through the paste-like environment of these mixtures. The protocol can be used on a multi-gram scale to ...
DOI:
10.1021/acs.joc.1c01057

13. (Dicyclopentadiene) platinum(II) dichloride: an efficient catalyst for the hydrosilylation reaction between alkenes and triethoxysilane

Author:
Huarui Wu; Chaoyue Zheng; Naiwu Chen; Jie Zhu; Deqing Gao
Source:
Tetrahedron letters 2017 pp. -
ISSN:
0040-4039
Subject:
alkenes; biphenyl; catalysts; chemical reactions; isomers; platinum
Abstract:
... (Dicyclopentadiene) platinum(II) dichloride was found to be an efficient hydrosilylation catalyst (homogeneous) upon a wide variety of functionalized alkenes and alkenes terminated with chemical moieties (diphenyl amino-, N-carbazol- and N-isoindoline-1,3-dione-). It is noteworthy that the hydrosilylation of aminated alkenes with triethoxysilane exhibited the yield of over 70% and the selectivity ...
DOI:
10.1016/j.tetlet.2017.03.017

14. (E)-α,β-unsaturated amides from tertiary amines, olefins and CO via Pd/Cu-catalyzed aerobic oxidative N-dealkylation

Author:
Renyi Shi; Hua Zhang; Lijun Lu; Pei Gan; Yuchen Sha; Heng Zhang; Qiang Liu; Matthias Beller; Aiwen Lei
Source:
Chemical communications 2015 v.51 no.15 pp. 3247-3250
ISSN:
1364-548X
Subject:
alkenes; amides; catalysts; catalytic activity; chemical reactions; chemoselectivity; palladium; secondary amines; tertiary amines
Abstract:
... A novel Pd/Cu-catalyzed chemoselective aerobic oxidative N-dealkylation/carbonylation reaction has been developed. Tertiary amines are utilized as a “reservoir” of “active” secondary amines in this transformation, which inhibits the formation of undesired by-products and the deactivation of the catalysts. This protocol allows for an efficient and straightforward construction of synthetically usefu ...
DOI:
10.1039/c4cc08925a

15. (Fe,Co)@nitrogen-doped graphitic carbon nanocubes derived from polydopamine-encapsulated metal–organic frameworks as a highly stable and selective non-precious oxygen reduction electrocatalyst

Author:
Jiangbo Xi; Yating Xia; Yangyang Xu; Junwu Xiao; Shuai Wang
Source:
Chemical communications 2015 v.51 no.52 pp. 10479-10482
ISSN:
1364-548X
Subject:
catalysts; catalytic activity; cobalt; coordination polymers; durability; electrochemistry; graphene; nanomaterials; oxygen; platinum; pyrolysis
Abstract:
... A facile approach is reported to synthesize (Fe,Co)@nitrogen-doped graphitic carbon (NGC) nanocubes (NCs) via the pyrolysis of polydopamine-encapsulated Fe₃[Co(CN)₆]₂ NCs at 700 °C. Besides the comparable catalytic activity for oxygen reduction reaction (ORR) to the Pt/C catalyst, it showed much more outstanding catalytic selectivity and superior durability. ...
DOI:
10.1039/c5cc03946k

16. (Fe,N-codoped carbon nanotube)/(Fe-based nanoparticle) nanohybrid derived from Fe-doped g-C3N4: A superior catalyst for oxygen reduction reaction

Author:
Yanpei Zhang; Ruibin Jiang; Zhongke Wang; Yanzhong Xue; Jie Sun; Yingjie Guo
Source:
Journal of colloid and interface science 2020 v.579 pp. 391-400
ISSN:
0021-9797
Subject:
batteries; carbon nanotubes; carbon nitride; carbonization; catalysts; catalytic activity; electrochemistry; fuel cells; iron; moieties; nanohybrids; nanoparticles
Abstract:
... Transition metal- and N-codoped carbon nanotubes (CNTs) have superior catalytic activity because the curling surface enhances the bonding ability of atoms within CNTs to other species. However, it is a great challenge to prepare CNTs with transition metal- and N-doped at high level during the growth of CNTs. Here, (Fe,N-codoped CNT)/(Fe-based nanoparticle) (Fe,N-CNT/FeNP) hybrid nanostructures are ...
DOI:
10.1016/j.jcis.2020.06.057

17. (Fe₁₋ₓNiₓ)₃N nanoparticles: the structure, magnetic and photocatalytic properties for water splitting

Author:
Xiang Lei; Peng Zhang; Xiaobai Wang; Wei Wang; Hua Yang
Source:
RSC advances 2016 v.6 no.50 pp. 44641-44645
ISSN:
2046-2069
Subject:
X-ray diffraction; X-ray photoelectron spectroscopy; catalysts; irradiation; magnetic properties; magnetism; nanoparticles; photocatalysis; sol-gel processing; transmission electron microscopes; transmission electron microscopy
Abstract:
... Fe₃N and (Fe₁₋ₓNiₓ)₃N nanoparticles (NPs) were prepared via a simple sol–gel method. The structures, morphology, and magnetic properties of the NPs are investigated using X-ray diffraction, X-ray photoelectron spectroscopy, transmission electron microscope. It is shown that (Fe₁₋ₓNiₓ)₃N possess a spherical morphology with a core–shell structure from the TEM results. The magnetic properties of Fe₃N ...
DOI:
10.1039/c6ra05990b

18. (Guanidine)copper Complex-Catalyzed Enantioselective Dynamic Kinetic Allylic Alkynylation under Biphasic Condition

Author:
Xi-Yang Cui; Yicen Ge; Siu Min Tan; Huan Jiang; Davin Tan; Yunpeng Lu; Richmond Lee; Choon-Hong Tan
Source:
Journal of the American Chemical Society 2018 v.140 no.27 pp. 8448-8455
ISSN:
1520-5126
Subject:
Lewis bases; X-ray diffraction; alkynes; bromides; catalysts; copper; enantiomers; enantioselectivity; guanidinium; ligands; mass spectrometry; organobromine compounds
Abstract:
... Highly enantioselective allylic alkynylation of racemic bromides under biphasic condition is furnished in this report. This approach employs functionalized terminal alkynes as pro-nucleophiles and provides 6- and 7-membered cyclic 1,4-enynes with high yields and excellent enantioselectivities (up to 96% ee) under mild conditions. Enantioretentive derivatizations highlight the synthetic utility of ...
DOI:
10.1021/jacs.7b12806

19. (La₀.₆₅Sr₀.₃)₀.₉₅FeO₃₋δ perovskite with high oxygen vacancy as efficient bifunctional electrocatalysts for Zn–air batteries

Author:
Liyang Luo; Zhongyi Liu; Zhiyuan Wang
Source:
RSC advances 2021 v.11 no.62 pp. 38977-38981
ISSN:
2046-2069
Subject:
catalysts; electrochemistry; electrolytes; oxygen; oxygen production
Abstract:
... Developing low-cost, highly efficient electrocatalysts for the oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) is desirable for rechargeable metal–air batteries. Herein, a series of perovskite structured (La₀.₆₅Sr₀.₃)₀.₉₅FeO₃₋δ catalysts with A-site deficiency were synthesized through a scalable solid state synthesis method at different calcination temperatures. The electrocata ...
DOI:
10.1039/d1ra07920d

20. (N, B) Dual Heteroatom-Doped Hierarchical Porous Carbon Framework for Efficient Electroreduction of Carbon Dioxide

Author:
Chen Jia; Wenhao Ren; Xianjue Chen; Wanfeng Yang; Chuan Zhao
Source:
ACS sustainable chemistry & engineering 2020 v.8 no.15 pp. 6003-6010
ISSN:
2168-0485
Subject:
carbon; carbon dioxide; catalysts; catalytic activity; electrochemistry; freeze drying; heat
Abstract:
... A versatile salt–sugar method is developed to synthesize a (N, B) dual heteroatom-doped three-dimensional (3D) hierarchical porous carbon network. Through freeze drying and a two-stage heating process, the N and B atoms can be atomically dispersed into the carbon structure with high doping levels (N, 10.2 at. %; B, 8.86 at. %). The as-prepared metal-free catalyst exhibit a high CO₂-to-CO Faradaic ...
DOI:
10.1021/acssuschemeng.0c00739

21. (NH4)2Ce(NO3)6 as an inexpensive, eco-friendly, efficient catalyst for the synthesis of 5-substituted 1-H tetrazoles from nitriles

Author:
Satyanand Kumar; Shristy Dubey; Nisha Saxena; Satish Kumar Awasthi
Source:
Tetrahedron letters 2014 v.55 no.44 pp. 6034-6038
ISSN:
0040-4039
Subject:
ammonium; catalysts; ceric ammonium nitrate; chemical structure; cycloaddition reactions; nitriles
Abstract:
... Ceric ammonium nitrate (CAN) is found to be a suitable, inexpensive, and effective non-toxic catalyst for a smooth (3+2) cycloaddition of organic nitriles with NaN3 to afford 5-substituted 1H-tetrazoles in excellent yields. Shorter reaction times, easy work-up, and substantial and pure product formation are the key advantages of the present method. ...
DOI:
10.1016/j.tetlet.2014.09.010

22. (PhC(NtBu)₂Al)₂(SiH₂)₄ six-membered heterocycle: comparable in structure to cyclohexane

Author:
Jiancheng Li; Mingdong Zhong; Helena Keil; Hongping Zhu; Regine Herbst-Irmer; Dietmar Stalke; Sriman De; Debasis Koley; Herbert W. Roesky
Source:
Chemical communications 2019 v.55 no.16 pp. 2360-2363
ISSN:
1364-548X
Subject:
catalysts; chemical bonding; chemical reactions; cyclohexanes
Abstract:
... A silicon–aluminum heterocycle LAl(SiH₂SiH₂)₂AlL (L = PhC(NtBu)₂) (1) was prepared. Compound 1 exhibits a unique (N₂Al)₂(SiH₂)₄ centrosymmetric six-membered ring structure with a chair conformation, which is comparable with that of cyclohexane. Furthermore, two intermediate analogues, silylene–alane adduct LSi(AlMe₃)–Si(AlMe₃)L (2) and silylene–alane oxidative product [LAlHSiH₂Mes]₂ (3) were obtai ...
DOI:
10.1039/c8cc10124h

23. (R)-(+)-N-Methylbenzoguanidine ((R)-NMBG) catalyzed acylative kinetic resolution of racemic 3-hydroxy-3-aryl-propanoates

Author:
Akira Yamada; Kenya Nakata
Source:
Tetrahedron letters 2016 v.57 pp. 4697-4701
ISSN:
0040-4039
Subject:
aromatic compounds; catalysts; chemical reactions; chemical structure; cyclohexanes; esters
Abstract:
... (R)-(+)-N-methylbenzoguanidine ((R)-NMBG) functioned as an efficient acyl transfer catalyst for the acylative kinetic resolution of racemic β-hydroxy esters using cyclohexane carboxylic anhydride under mild reaction conditions. A tert-butyl ester moiety is necessary to achieve a high selectivity. The effects of the substituents on the aromatic rings of the substrates were systematically investigat ...
DOI:
10.1016/j.tetlet.2016.09.014

24. (S)-Threonine/α,α-(S)-diphenylvalinol-derived chiral ionic liquid: an immobilized organocatalyst for asymmetric syn-aldol reactions

Author:
Natalia A. Larionova; Alexandr S. Kucherenko; Dmitry E. Siyutkin; Sergei G. Zlotin
Source:
Tetrahedron 2011 v.67 no.10 pp. 1948-1954
ISSN:
0040-4020
Subject:
aldehydes; carbon; catalysts; chemical reactions; enantiomers; heterocyclic compounds; ionic liquids; ketones
Abstract:
... Chiral ionic liquids containing (S)- or (R)-threonine amide and α,α-(S)-diphenylvalinol units were synthesized In the presence of the (S)-threonine-derived catalyst reactions between ketones with secondary carbon atom(s) at the α-position with respect to the carbonyl group and aromatic (heteroaromatic) aldehydes afforded the corresponding syn-aldols in high yields (up to 99%) and with high diaster ...
DOI:
10.1016/j.tet.2011.01.017

25. (Thio)urea Organocatalyst Equilibrium Acidities in DMSO

Author:
Jakab Gergely; Tancon Carlo; Zhang Zhiguo; Lippert Katharina M.; Schreiner Peter R.
Source:
Organic letters 2012 v.14 no.7 pp. 1724-1727
ISSN:
1523-7052
Subject:
catalysts; chemical reactions; chemical structure; dimethyl sulfoxide; urea
Abstract:
... Bordwell’s method of overlapping indicators was used to determine the pKₐ values of some of the most popular (thio)urea organocatalysts via UV spectrophotometric titrations. The incremental effect of CF₃ groups on acidic strength was also investigated. The pKₐ’s are in the range of 8.5–19.6. The results may lead to a better understanding of noncovalent organocatalysis and may aid in future catalys ...
DOI:
10.1021/ol300307c

26. (Thiolan-2-yl)diphenylmethyl benzyl ether/N,N′-diarylurea cocatalyzed asymmetric aziridination of cinnamyl bromide and aryl aldimine

Author:
Shang-Hua Wang; Rong-Jie Chein
Source:
Tetrahedron 2016 v.72 pp. 2607-2615
ISSN:
0040-4020
Subject:
catalysts; chemical reactions; chemical structure; organic compounds; sulfides
Abstract:
... A dual catalyst system using THT-based chiral sulfide 2a and H-bond donor 10a was developed for the asymmetric imino Corey–Chaykovsky reaction. Under the optimum reaction conditions, cinnamyl bromide reacted with a wide scope of N-diphenylphosphinic aldimines, to give the major trans-aryl cinnamyl aziridines with up to 98% ee. The role of H-bond donor 10a was demonstrated empirically as well. ...
DOI:
10.1016/j.tet.2014.12.063

27. (UV/Oxidative) dual curing polyurethane dispersion from cardanol based polyol: Synthesis and characterization

Author:
Vikash Mishra; Jatin Desai; Kalpesh I. Patel
Source:
Industrial crops and products 2018 v.111 pp. 165-178
ISSN:
0926-6690
Subject:
Fourier transform infrared spectroscopy; acetone; acid value; carbon; catalysts; coatings; color; epoxides; gels; nuclear magnetic resonance spectroscopy; phosphine; physicochemical properties; polyols; polyurethanes; propionic acid; solvents; stable isotopes; viscosity
Abstract:
... This study reports the synthesis and property evaluation of UV/oxidative dual curing waterborne polyurethane dispersion prepared from cardanol-based polyol using different mode of curing. Cardanol-based polyol was prepared by reacting epoxidized cardanol with itaconic acid in presence of triphenyl phosphine catalyst. Structures of cardanol-based intermediates (both epoxidized cardanol and polyol) ...
DOI:
10.1016/j.indcrop.2017.10.015

28. (Ultra)Fast Catalyst-Free Macromolecular Conjugation in Aqueous Environment at Ambient Temperature

Author:
Glassner Mathias; Delaittre Guillaume; Kaupp Michael; Blinco James P.; Barner-Kowollik Christopher
Source:
Journal of the American Chemical Society 2012 v.134 no.17 pp. 7274-7277
ISSN:
1520-5126
Subject:
ambient temperature; catalysts; cycloaddition reactions; electrospray ionization mass spectrometry; nuclear magnetic resonance spectroscopy; polyethylene glycol; polymerization; solvents
Abstract:
... Tailor-made water-soluble macromolecules, including a glycopolymer, obtained by living/controlled RAFT-mediated polymerization are demonstrated to react in water with diene-functionalized poly(ethylene glycol)s without pre- or post-functionalization steps or the need for a catalyst at ambient temperature. As previously observed in organic solvents, hetero-Diels–Alder (HDA) conjugations reached qua ...
DOI:
10.1021/ja301762y

29. (Z)- or (E)-Selective Hydrogenation of Potassium (3,3,3-Trifluoroprop-1-yn-1-yl)trifluoroborate: Route to Either Isomer of β-Trifluoromethylstyrenes

Author:
Ramachandran P. Veeraraghavan; Mitsuhashi Wataru
Source:
Organic letters 2015 v.17 no.5 pp. 1252-1255
ISSN:
1523-7052
Subject:
catalysts; catalytic activity; hydrogenation; isomers; organic compounds; palladium; potassium
Abstract:
... A Pd-catalyzed hydrogenation of potassium (3,3,3-trifluoroprop-1-yn-1-yl)trifluoroborate providing either the (Z)- or (E)-isomer of the vinylborate in >98% purity is described. The initially formed (Z)-isomer of the alkene is transformed to the (E)-isomer with time, irrespective of the catalyst used; coupling with bromo- and iodoarenes provides a variety of (Z)- or (E)-β-trifluoromethylstyrenes. A ...
DOI:
10.1021/acs.orglett.5b00235

30. (Z)-Selective Hydroboration of Terminal Alkynes Catalyzed by a PSP–Pincer Rhodium Complex

Author:
Yanzong Lyu; Naoyuki Toriumi; Nobuharu Iwasawa
Source:
Organic letters 2021 v.23 no.23 pp. 9262-9266
ISSN:
1523-7052
Subject:
alkynes; catalysts; chemoselectivity; rhodium
Abstract:
... A highly (Z)-selective hydroboration of terminal alkynes was achieved using a thioxanthene-based PSP–pincer rhodium catalyst. This hydroboration exhibited good chemoselectivity toward alkynes over carbonyl compounds such as ketones and aldehydes. The mechanistic studies indicated the involvement of rhodium–vinylidene intermediates, and the high (Z)-selectivity could be attributed to the rigid and ...
DOI:
10.1021/acs.orglett.1c03606

31. (Z)-Selective cross-dimerization of arylacetylenes with silylacetylenes catalyzed by vinylideneruthenium complexes

Author:
Hiroyuki Katayama; Hiroshi Yari; Masaki Tanaka; Fumiyuki Ozawa
Source:
Chemical communications 2005 v. no.34 pp. 4336-4338
ISSN:
1364-548X
Subject:
catalysts; catalytic activity; chemical reactions; ligands; phosphine
Abstract:
... The vinylideneruthenium(ii) complexes bearing bulky and basic tertiary phosphine ligands, RuCl₂(CCHPh)L₂ (L = PPrⁱ₃, PCy₃), serve as good catalyst precursors for (Z)-selective cross-dimerization between arylacetylenes and silylacetylenes in the presence of N-methylpyrrolidine. ...
DOI:
10.1039/b504436g

32. (Z)-γ-Alkylidenebutenolide Synthesis through Au(I)-Catalyzed 1,3-Acyloxy Migration and the Carbonyl–Ene Reaction

Author:
Pathan Mosim Amin; Qi Cui; Shaozhong Wang; Zhi-Xiang Yu
Source:
Organic letters 2021 v.23 no.15 pp. 5669-5673
ISSN:
1523-7052
Subject:
Lewis acids; catalysts; chlorides; gold
Abstract:
... A bimetallic protocol has been developed to construct (Z)-γ-alkylidenebutenolide compounds from readily available propargyl α-ketoesters. It involves a gold-catalyzed 1,3-acyloxy migration of propargyl α-ketoesters and a carbonyl-ene cyclization of in situ generated allenyl esters. DFT calculations suggest that the copper salt might play dual roles as both chloride abstractor facilitating the gene ...
DOI:
10.1021/acs.orglett.1c01782

33. (η⁴-Tetrafluorobenzobarrelene)-η¹-((tri-4-fluorophenyl)phosphine)-η¹-(2-phenylphenyl)rhodium(I): A Catalyst for the Living Polymerization of Phenylacetylenes

Author:
Nicholas Sheng Loong Tan; Gareth L. Nealon; Stephen A. Moggach; Jason M. Lynam; Mark I. Ogden; Massimiliano Massi; Andrew B. Lowe
Source:
Macromolecules 2021 v.54 no.13 pp. 6191-6203
ISSN:
1520-5835
Subject:
X-ray diffraction; catalysts; composite polymers; crystallization; density functional theory; energy; geometry; ligands; molecular weight; nuclear magnetic resonance spectroscopy; phosphine; polymerization; quantum mechanics; rhodium; stereospecificity
Abstract:
... (η⁴-Tetrafluorobenzobarrelene)-η¹-((tri-4-fluorophenyl)phosphine)-η¹-(2-phenylphenyl)rhodium(I), Rh(tfb)(biph)(PAr₃), was prepared and evaluated as a catalyst in the controlled, stereospecific (co)polymerization of arylacetylenes. Following recrystallization, the complex was characterized by single-crystal X-ray diffraction, elemental analysis, and multinuclear NMR spectroscopy, including ¹⁰³Rh an ...
DOI:
10.1021/acs.macromol.1c00906

34. 0.2 V Electrolysis Voltage-Driven Alkaline Hydrogen Production with Nitrogen-Doped Carbon Nanobowl-Supported Ultrafine Rh Nanoparticles of 1.4 nm

Author:
Nan Jia; Yanping Liu; Lei Wang; Pei Chen; Xinbing Chen; Zhongwei An; Yu Chen
Source:
ACS applied materials & interfaces 2019 v.11 no.38 pp. 35039-35049
ISSN:
1944-8252
Subject:
Gibbs free energy; adsorption; carbon; catalysts; chemical bonding; density functional theory; electrolysis; energy conservation; hydrazine; hydrogen; hydrogen production; nanoparticles; oxidation; potassium hydroxide; rhodium
Abstract:
... The development of highly effective and low-cost electrocatalysts for energy-saving hydrogen production via water splitting is still a great challenge. Herein, porous nitrogen-doped carbon nanobowls (N-CBs) have been designed and used for the controlled growth of ultrafine rhodium (Rh) nanoparticles. With the aid of interfacial bonding of Rh and N, ultrafine Rh nanoparticles with an average size o ...
DOI:
10.1021/acsami.9b13586

35. 0.5wt.% Pd/C catalyst for purification of terephthalic acid: Irreversible deactivation in industrial plants

Author:
R. Pellegrini; G. Agostini; E. Groppo; A. Piovano; G. Leofanti; C. Lamberti
Source:
Journal of catalysis 2011 v.280 no.2 pp. 150-160
ISSN:
0021-9517
Subject:
alloys; aluminum; catalysts; catalytic activity; chromium; crystals; energy-dispersive X-ray analysis; iron; lead; molybdenum; poisoning; spectroscopy; surface area; transmission electron microscopy
Abstract:
... A systematic study on several spent catalysts, withdrawn from different terephthalic acid purification reactors loaded with the same fresh catalyst (0.5wt.% Pd/C, type D3065, supplied by Chimet SpA), has been carried out. Spent catalysts characterized by different lifetimes, position in the catalytic bed, sintering degree, and types of contaminant (mainly S, Pb, and Mo) have been investigated by T ...
DOI:
10.1016/j.jcat.2011.03.012

36. 0D/2D NiS2/V-MXene composite for electrocatalytic H2 evolution

Author:
Panyong Kuang; Min He; Bicheng Zhu; Jiaguo Yu; Ke Fan; Mietek Jaroniec
Source:
Journal of catalysis 2019 v.375 pp. 8-20
ISSN:
0021-9517
Subject:
X-ray photoelectron spectroscopy; active sites; catalysts; electrochemistry; electrolysis; electron transfer; hydrogen; hydrogen production; nanoparticles; titanium; vanadium
Abstract:
... As a member of the family of so-called MXenes, two-dimensional vanadium carbide (V2CTx, denoted as V-MXene) used in electrocatalytic hydrogen evolution reaction (HER) is still in the stage of theoretical study without significant experimental exploration. Here, we present the theoretical and experimental studies on the intrinsic structural and electrochemical properties of V-MXene-based hybrid (Ni ...
DOI:
10.1016/j.jcat.2019.05.019

37. 0D/2D heterojunctions of molybdenum carbide-tungsten carbide quantum dots/N-doped graphene nanosheets as superior and durable electrocatalysts for hydrogen evolution reaction

Author:
Lili Huo; Baocang Liu; Zhiqing Gao; Jun Zhang
Source:
Journal of materials chemistry A 2017 v.5 no.35 pp. 18494-18501
ISSN:
2050-7496
Subject:
catalysts; durability; electrochemistry; electrons; graphene; hydrogen production; molybdenum; nanocomposites; nanocrystals; nanohybrids; nanosheets; pH; quantum dots
Abstract:
... It is of great importance to exploit and design efficient and low-cost alternatives to platinum-based electrocatalysts for the hydrogen evolution reaction (HER). In this work, we report novel well-defined 0D/2D heterojunctions of uniform molybdenum carbide-tungsten carbide quantum dots ((Mo₂C)ₓ–(WC)₁₋ₓ–QDs, ∼3–5 nm)/N-doped graphene (NG) nanosheets with a two-dimensional layered structure obtained ...
DOI:
10.1039/c7ta02864d

38. 0D/3D coupling of g-C3N4 QDs/hierarchical macro-mesoporous CuO-SiO2 for high-efficiency norfloxacin removal in photo-Fenton-like processes

Author:
Yunhao Tian; Nan Jia; Hui Ma; Geying Liu; Zhibin Xiao; Yizhou Wu; Liang Zhou; Juying Lei; Lingzhi Wang; Yongdi Liu; Jinlong Zhang
Source:
Journal of hazardous materials 2021 v.419 pp. 126359
ISSN:
0304-3894
Subject:
antibiotics; catalysts; catalytic activity; composite polymers; light; macropores; mass transfer; norfloxacin; oxidation; pollutants; pollution; pollution control; polystyrenes; singlet oxygen; surface area
Abstract:
... Photo-Fenton process is an advanced oxidation technology, which is used to eliminate organic pollutants in environmental pollution. In this paper, g-C₃N₄ quantum dots incorporated hierarchical macro-mesoporous CuO-SiO₂ (MM SC-QDs) composite was successfully fabricated by a dual-template method combined with polystyrene sphere (PS) crystal and copolymer F127. With the presence of H₂O₂, MM SC-QDs ex ...
DOI:
10.1016/j.jhazmat.2021.126359

39. 1 T-MoSe2 monolayer supported single Pd atom as a highly-efficient bifunctional catalyst for ORR/OER

Author:
Zengming Qin; Jingxiang Zhao
Source:
Journal of colloid and interface science 2022 v.605 pp. 155-162
ISSN:
0021-9797
Subject:
catalysts; catalytic activity; electrochemistry; nanosheets; oxygen production
Abstract:
... The development of highly-efficient catalysts for oxygen reduction reaction (ORR) or oxygen evolution reaction (OER) is highly crucial for the commercial applications of some novel energy-related devices. Herein, using comprehensive first-principles computations, the potential of a variety of single metal-based catalysts supported by MoSe₂ nanosheet to boost the ORR or OER process was evaluated. T ...
DOI:
10.1016/j.jcis.2021.07.087

40. 1,1-Addition of α-C₂-Bridged Biphospholes with Alkynes

Author:
Yanjie Liu; Keke Zhang; Rongqiang Tian; Zheng Duan; François Mathey
Source:
Organic letters 2020 v.22 no.17 pp. 6972-6976
ISSN:
1523-7052
Subject:
X-ray diffraction; alkynes; catalysts; chemoselectivity
Abstract:
... An unusual chemoselective 1,1-addition of α-C₂-bridged biphospholes to terminal alkynes is reported. The developed protocol provides simple access to the unknown 1,3-diphosphepines, which has potential applications in the coordination and catalyst chemistry. Their Pd and Mo complexes were studied by single-crystal X-ray diffraction analysis. This method features excellent chemoselectivity, high st ...
DOI:
10.1021/acs.orglett.0c02521

41. 1,1-Diamino-2-nitroethylenes as excellent hydrogen bond donor organocatalysts in the Michael addition of carbon-based nucleophiles to β-nitrostyrenes

Author:
Rodrigo C. da Silva; Gustavo P. da Silva; Diego P. Sangi; João G. de M. Pontes; Antônio G. Ferreira; Arlene G. Corrêa; Márcio W. Paixão
Source:
Tetrahedron 2013 v.69 pp. 9007-9012
ISSN:
0040-4020
Subject:
catalysts; chemical reactions; chemical structure; hydrogen bonding; organic compounds
Abstract:
... A new class of hydrogen bond donor catalysts based on the 1,1-diamino-2-nitroethylene scaffold has been introduced for the activation of trans-β-nitrostyrenes toward reactions with a range of carbon-based nucleophiles, affording the corresponding adducts in excellent yields. Importantly, this new set of organocatalysts is easily prepared from commercially available starting materials in mild react ...
DOI:
10.1016/j.tet.2013.08.040

42. 1,2 Enriched polymerization of isoprene by cobalt complex carrying aminophosphory fused (PN3) ligand

Author:
Xiaoyu Jia; Xuequan Zhang; Dirong Gong
Source:
Journal of polymer science 2018 v.56 no.20 pp. 2286-2293
ISSN:
0887-624X
Subject:
catalysts; cobalt; differential scanning calorimetry; isomers; isoprene; ligands; magnesium; molecular weight; new family; nuclear magnetic resonance spectroscopy; polymerization; polymers; temperature
Abstract:
... Metal‐catalyzed selective isoprene polymerization has been a major entry toward cis‐1,4, trans‐1,4, and 3,4 isomers of polyisoprene, however, 1,2 selective polymerization of isoprene has not yet been achieved due to the steric problem. In this work, difluoro cobalt complexes carrying aminophosphory (‐HN‐P(=O) ᵗBu₂‐) fused pyrazol‐pyridine ligand has been prepared and characterized. In combination ...
DOI:
10.1002/pola.29201

43. 1,2,3-Trimethoxypropane, a glycerol-based solvent with low toxicity: new utilization for the reduction of nitrile, nitro, ester, and acid functional groups with TMDS and a metal catalyst

Author:
Marc Sutter; Leyla Pehlivan; Romain Lafon; Wissam Dayoub; Yann Raoul; Estelle Métay; Marc Lemaire
Source:
Green chemistry 2013 v.15 no.11 pp. 3020-3026
ISSN:
1463-9270
Subject:
acute toxicity; aluminum; amines; aquatic environment; catalysts; catalytic activity; chemical reduction; copper; ecotoxicology; glycerol; green chemistry; hydrides; moieties; mutagenicity; nitriles; solvents
Abstract:
... 1,2,3-Trimethoxypropane (1,2,3-TMP) was prepared from glycerol in one step in good yield and selectivity by phase transfer catalysis. According to OECD guidelines, a toxicity study was realized for this compound. It revealed that 1,2,3-TMP has a low acute toxicity, no skin sensitization, no mutagenicity and no ecotoxicity in an aquatic environment. This compound was also used as a solvent for the ...
DOI:
10.1039/c3gc41082j

44. 1,2- and 1,4-Additions of 2-Alkynylcyclohexadienimines with Aromatic Amines To Access 4-Amino-N-arylindoles and -azepinoindoles

Author:
Zhang Li; Li Zhiming; Fan Renhua
Source:
Organic letters 2012 v.14 no.23 pp. 6076-6079
ISSN:
1523-7052
Subject:
aldehydes; aromatic amines; catalysts; chemical structure; indoles; oxidation
Abstract:
... 2-Alkynylcyclohexadienimines, derived from the oxidation of 2-alkynylanilines, react with aromatic amines leading to N-arylindoles with a 4-amino substitution. The reaction was metal-controlled, and Bi(OTf)₃ proved to be the best catalyst. The resulting 4-amino N-arylindoles could be converted to azepino[4,3,2-cd]indoles through condensation with aldehydes. ...
DOI:
10.1021/ol3029675

45. 1,2-Alkylarylation of Styrenes with α-Carbonyl Alkyl Bromides and Indoles Using Visible-Light Catalysis

Author:
Li Meng; Yang Ji; Ouyang Xuan-Hui; Yang Yuan; Hu Ming; Song Ren-Jie; Li Jin-Heng
Source:
Journal of organic chemistry 2016 v.81 no.16 pp. 7148-7154
ISSN:
1520-6904
Subject:
bromides; catalysts; catalytic activity; chemical bonding; indoles; moieties; organic chemistry; redox reactions
Abstract:
... A new intermolecular 1,2-alkylarylation of styrenes with α-carbonyl alkyl bromides and indoles using fac-[Ir(ppy)₃] as the photoredox catalyst has been developed. The method allows the simultaneous formation of two new carbon–carbon bonds through three component reaction, and represents a new single-electron transfer (SET) strategy for the 1,2-alkylarylation of the styrenes with broad substrate sc ...
DOI:
10.1021/acs.joc.6b01002

46. 1,2-Benzoxathiin-4(3H)-one 2,2-dioxide – new enol nucleophile in three-component interaction with benzaldehydes and active methylene nitriles

Author:
Galyna V. Grygoriv; Dmitry A. Lega; Valentin P. Chernykh; Lucjusz Zaprutko; Andrzej K. Gzella; Anna Pawełczyk; Leonid A. Shemchuk
Source:
RSC advances 2018 v.8 no.65 pp. 37295-37302
ISSN:
2046-2069
Subject:
Lewis bases; aldehydes; ammonium acetate; catalysts; enols; nitriles; pyridines; salts
Abstract:
... The reactivity of 1,2-benzoxathiin-4(3H)-one 2,2-dioxide was studied in multicomponent type reactions for the first time, namely, in a three-component interaction with active methylene nitriles and aromatic aldehydes in order to construct condensed 2-amino-4H-pyran derivatives. The reaction outcome strongly depended on the nature of an active methylene nitrile and an arenecarbaldehyde. Application ...
DOI:
10.1039/c8ra06801a

47. 1,2-Dibutoxyethane-Promoted Oxidative Cleavage of Olefins into Carboxylic Acids Using O₂ Under Clean Conditions

Author:
Jinhua Ou; Hong Tan; Saiyu He; Wei Wang; Bonian Hu; Gang Yu; Kaijian Liu
Source:
Journal of organic chemistry 2021 v.86 no.21 pp. 14974-14982
ISSN:
1520-6904
Subject:
catalysts; organic chemistry; oxidation
Abstract:
... Herein, we report the first example of an effective and green approach for the oxidative cleavage of olefins to carboxylic acids using a 1,2-dibutoxyethane/O₂ system under clean conditions. This novel oxidation system also has excellent functional-group tolerance and is applicable for large-scale synthesis. The target products were prepared in good to excellent yields by a one-pot sequential trans ...
DOI:
10.1021/acs.joc.1c01701

48. 1,2-Diphenylethylenediamine linked chiral Ti(iv) complex—a new entry to the highly enantioselective silylcyanation of aliphatic and aromatic aldehydes

Author:
Chun-Wei Chang; Chun- TzuYang; Chyuan-Der Hwang; Biing-Jiun Uang
Source:
Chemical communications 2002 v. no.1 pp. 54-55
ISSN:
1364-548X
Subject:
aldehydes; catalysts; chemical reactions; enantioselectivity; titanium
Abstract:
... Highly enantioselective silylcyanation of aliphatic and aromatic aldehydes was achieved by using a 1,2-diphenylethylenediamine linked chiral Ti(iv) complex as the catalyst. ...
DOI:
10.1039/b107867d

49. 1,2-Propanediol as a Surrogate Molecule of Glycerol for Mechanistic Studies of Selective Hydrodeoxygenation Reactions over Mo₂C and Cu/Mo₂C Surfaces

Author:
Zhexi Lin; Weiming Wan; Jingguang G. Chen
Source:
ACS sustainable chemistry & engineering 2019 v.7 no.9 pp. 8077-8082
ISSN:
2168-0485
Subject:
biodiesel; biomass; catalysts; copper; fuel production; gases; glycerol; models; molybdenum; vapor pressure
Abstract:
... The upgrading of glycerol, a byproduct from biodiesel production, is important for developing more sustainable biomass conversion technologies. Nonetheless, the low vapor pressure and structural complexity of glycerol limit mechanistic studies of gas-phase reactions on model surfaces and powder catalysts. In this work, we demonstrate the feasibility of using 1,2-propanediol (PDO) as a surrogate co ...
DOI:
10.1021/acssuschemeng.9b01051

50. 1,2-Selective Hydrosilylation of Conjugated Dienes

Author:
Parker Sarah E.; Börgel Jonas; Ritter Tobias
Source:
Journal of the American Chemical Society 2014 v.136 no.13 pp. 4857-4860
ISSN:
1520-5126
Subject:
alkenes; catalysts; catalytic activity; platinum
Abstract:
... Selective 1,2-hydrosilylation of 1,3-dienes is a challenging problem in transition metal catalysis. Butadiene, specifically, would be a useful substrate because 3-butenylsilane products have promise as superior coupling reagents for hybrid organic/inorganic materials synthesis. We report the first selective 1,2-hydrosilylation of conjugated dienes including butadiene. Hydrosilylation proceeds thro ...
DOI:
10.1021/ja5008596