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You searched for: Journal Green chemistry Remove constraint Journal: Green chemistry Publication Year 2016 Remove constraint Publication Year: 2016 Source 2016 v.18 no.4 Remove constraint Source: 2016 v.18 no.4
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1. A mild biomass pretreatment using γ-valerolactone for concentrated sugar production

Author:
Shuai, Li; Questell-Santiago, Ydna M.; Luterbacher, Jeremy S.
Source:
Green chemistry 2016 v.18 no.4 pp. 937-943
ISSN:
1463-9270
Subject:
biomass; cellulose; drying; enzymatic hydrolysis; ethanol; glucose; green chemistry; hardwood; lignin; lignocellulose; slurries; solvents; streams; sulfuric acid; temperature; tetrahydrofuran; washing; xylan; xylose
Abstract:
... Here we report that γ-valerolactone (GVL), a biomass-derived solvent, can be used to facilitate the mild pretreatment of lignocellulosic biomass. An 80% GVL, 20% water solvent system was used to pretreat hardwood at the mild temperature of 120 °C with an acid loading of 75 mM H₂SO₄. Up to 80% of original lignin was removed with 96–99% of original cellulose retained in the pretreated substrates. Th ...
DOI:
10.1039/c5gc02489g

2. A photoactive bimetallic framework for direct aminoformylation of nitroarenes

Author:
Nasir BaigThese authors contributed equally to this work., R. B.; Verma, Sanny; Nadagouda, Mallikarjuna N.; Varma, Rajender S.
Source:
Green chemistry 2016 v.18 no.4 pp. 1019-1022
ISSN:
1463-9270
Subject:
carbon nitride; catalysts; formic acid; graphene; green chemistry; hydrogen; nitroaromatic compounds; palladium; salts; silver
Abstract:
... A bimetallic catalyst, AgPd@g-C₃N₄, synthesized by reducing silver and palladium salts over graphitic carbon nitride (g-C₃N₄), enables the concerted reductive formylation of aromatic nitro compounds under photo-chemical conditions using formic acid, which serves the dual role of a hydrogen source and a formylating agent. ...
DOI:
10.1039/c5gc02799c

3. A reusable catalytic system for sulfide oxidation and epoxidation of allylic alcohols in water catalyzed by poly(dimethyl diallyl) ammonium/polyoxometalate

Author:
Zhao, Wei; Yang, Chunxia; Cheng, Zhiguo; Zhang, Zhenghui
Source:
Green chemistry 2016 v.18 no.4 pp. 995-998
ISSN:
1463-9270
Subject:
alcohols; ammonium; catalysts; epoxidation reactions; green chemistry; oxidation; polymers
Abstract:
... An effective catalyst based on a polyoxometalate and a polymer has been developed for the oxidation of sulfides and allylic alcohols under mild conditions in water. The synthetic procedure to form the catalyst and the separation of the products are convenient, and the system is reusable. ...
DOI:
10.1039/c5gc02527c

4. A self-assembled bisoxazoline/Pd composite microsphere as an excellent catalyst for Suzuki–Miyaura coupling reactions

Author:
Wang, Junke; Zong, Yingxiao; Wang, Xicun; Hu, Yulai; Yue, Guoren; Pan, Yi
Source:
Green chemistry 2016 v.18 no.4 pp. 967-973
ISSN:
1463-9270
Subject:
Fourier transform infrared spectroscopy; Suzuki reaction; acids; catalysts; catalytic activity; green chemistry; microparticles; nuclear magnetic resonance spectroscopy; organic halogen compounds; palladium; scanning electron microscopy; thermogravimetry
Abstract:
... A palladium complex based on a novel oxazoline, a solid microsphere catalyst, was successfully prepared. The structure and composition of the solid catalyst were characterized by SEM, ¹H NMR, TGA and FT-IR. This catalyst exhibits high catalytic activity for Suzuki–Miyaura cross-coupling reactions of various aryl halides and arylboronic acids in aqueous media. Moreover, the catalyst shows outstandi ...
DOI:
10.1039/c5gc01551k

5. Base-free conversion of 5-hydroxymethylfurfural to 2,5-furandicarboxylic acid over a Ru/C catalyst

Author:
Yi, Guangshun; Teong, Siew Ping; Zhang, Yugen
Source:
Green chemistry 2016 v.18 no.4 pp. 979-983
ISSN:
1463-9270
Subject:
aqueous solutions; carboxylic acids; catalysts; fructose; green chemistry; hydroxymethylfurfural
Abstract:
... The catalytic conversion of 5-hydroxymethyl furfural (HMF) to 2,5-furandicarboxylic acid (FDCA) over a commercial Ru/C catalyst in a base-free aqueous solution was studied with 88% FDCA yield. A self-catalyzed system using FDCA for the dehydration of fructose to HMF followed by base-free conversion of HMF to FDCA was also demonstrated with 53% overall yield. ...
DOI:
10.1039/c5gc01584g

6. Catalyst-free dehydrative SN1-type reaction of indolyl alcohols with diverse nucleophiles “on water”

Author:
Xiao, Jian; Wen, Hao; Wang, Liang; Xu, Lubin; Hao, Zhihui; Shao, Chang-Lun; Wang, Chang-Yun
Source:
Green chemistry 2016 v.18 no.4 pp. 1032-1037
ISSN:
1463-9270
Subject:
Lewis bases; alcohols; green chemistry; solvents
Abstract:
... A green and efficient dehydrative SN1-type reaction of indolyl alcohols with diverse nucleophiles was developed using water as the solvent, affording versatile 3-indolyl derivatives in high yields. The advantages of being catalyst-free, environmentally benign, and having a wide substrate scope and easy workup make it a promising method for preparation of indolyl compounds. ...
DOI:
10.1039/c5gc01838b

7. Catalytic conversion of 5-hydroxymethylfurfural into 2,5-furandiamidine dihydrochloride

Author:
JiaThese authors contributed equally., Xiuquan; Ma, Jiping; Wang, Min; Ma, Hong; Chen, Chen; Xu, Jie
Source:
Green chemistry 2016 v.18 no.4 pp. 974-978
ISSN:
1463-9270
Subject:
ammonia; ammonium chloride; catalysts; green chemistry; hydroxymethylfurfural; manganese oxides; methanol; nitrogen
Abstract:
... Via implantation of nitrogen from aq. NH₃ into hydroxymethylfurfural (HMF), dimethyl furan-2,5-dicarboximidate was synthesized over a manganese oxide catalyst. It was realized by the ammoxidation of HMF followed by methanol addition under mild reaction conditions. The imidate prepared in situ was further transformed into 2,5-furandiamidine dihydrochloride by reaction with ammonium chloride. ...
DOI:
10.1039/c5gc01985k

8. Catalytic transfer hydrogenation of biomass-derived 5-hydroxymethyl furfural to the building block 2,5-bishydroxymethyl furan

Author:
Hao, Weiwei; Li, Weifeng; Tang, Xing; Zeng, Xianhai; Sun, Yong; Liu, Shijie; Lin, Lu
Source:
Green chemistry 2016 v.18 no.4 pp. 1080-1088
ISSN:
1463-9270
Subject:
catalysts; ethanol; green chemistry; hydrogen; hydrogenation; hydroxymethylfurfural; ligands; solvents
Abstract:
... An efficient process for the catalytic transfer hydrogenation of biomass-derived 5-hydroxymethyl furfural (HMF) to 2,5-bishydroxymethyl furan (BHMF) is presented using ethanol as a hydrogen donor and solvent over low-cost ZrO(OH)₂. A HMF conversion of 94.1% and a DHMF selectivity of 88.9% were achieved at 423 K in 2.5 h. The fresh, spent, and regenerated catalysts were characterized comprehensivel ...
DOI:
10.1039/c5gc01221j

9. Chemo-enzymatic synthesis of 11-hydroxyundecanoic acid and 1,11-undecanedioic acid from ricinoleic acid

Author:
JangH.-Y. Jang and K. Singha equally contributed to this work., Hyun-Young; Singha, Kaushik; Kim, Hwan-Hee; Kwon, Yong-Uk; Park, Jin-Byung
Source:
Green chemistry 2016 v.18 no.4 pp. 1089-1095
ISSN:
1463-9270
Subject:
Escherichia coli; Micrococcus luteus; Pseudomonas putida; alcohol dehydrogenase; biotransformation; chemical bonding; green chemistry; ricinoleic acid
Abstract:
... A practical chemoenzymatic synthetic method for 11-hydroxyundecanoic acid and 1,11-undecanedioic acid from ricinoleic acid (12-hydroxyoleic acid) was investigated. Biotransformation of ricinoleic acid into the ester (3) via 12-ketooleic acid (2) was driven by recombinant Escherichia coli cells expressing an alcohol dehydrogenase from Micrococcus luteus and the Baeyer–Villiger monooxygenase from Ps ...
DOI:
10.1039/c5gc01017a

10. Do we need Green Analytical Chemistry?

Author:
Koel, Mihkel
Source:
Green chemistry 2016 v.18 no.4 pp. 923-931
ISSN:
1463-9270
Subject:
analytical chemistry; energy; green chemistry; solvents; wastes
Abstract:
... There is very strong opinion that Green Analytical Chemistry is needed beside so-called common Analytical Chemistry. In this review it is attempted to convince people that there is no need for a separate branch of analytical chemistry. The science of Analytical Chemistry is developing new tools for providing high quality information that meets the needs and demands of end-users, and which is provi ...
DOI:
10.1039/c5gc02156a

11. Efficient and selective aerobic oxidation of alcohols catalysed by MOF-derived Co catalysts

Author:
Bai, Cuihua; Li, Aiqin; Yao, Xianfang; Liu, Hongli; Li, Yingwei
Source:
Green chemistry 2016 v.18 no.4 pp. 1061-1069
ISSN:
1463-9270
Subject:
Raman spectroscopy; X-ray photoelectron spectroscopy; adsorption; air; atmospheric pressure; carbon; catalysts; catalytic activity; cobalt; desorption; green chemistry; magnetic fields; nanoparticles; nitrogen; oxidation; temperature; thermal degradation; transmission electron microscopy
Abstract:
... A simple and highly efficient nanostructured catalyst system comprising magnetic Co nanoparticles stabilized by N-doped carbon composite (Co/C–N) was synthesized by one-pot thermal decomposition of a Co-containing MOF. The catalysts were characterized by temperature programmed desorption (TPD), N₂ physical adsorption, powder X-ray diffraction (PXRD), Raman spectroscopy, transmission electron micro ...
DOI:
10.1039/c5gc02082d

12. Enhanced tunability afforded by aqueous biphasic systems formed by fluorinated ionic liquids and carbohydrates

Author:
FerreiraEqually contributing authors., Ana M.; Esteves, Pedro D. O.; Boal-Palheiros, Isabel; Pereiro, Ana B.; Rebelo, Luís Paulo N.; Freire, Mara G.
Source:
Green chemistry 2016 v.18 no.4 pp. 1070-1079
ISSN:
1463-9270
Subject:
cations; disaccharides; food colorants; green chemistry; hydrophilicity; hydrophobicity; ionic liquids; liquid-liquid extraction; monosaccharides; physical phases; polyols; salts; separation
Abstract:
... This work unveils the formation of novel aqueous biphasic systems (ABS) formed by perfluoroalkylsulfonate-based ionic liquids (ILs) and a large number of carbohydrates (monosaccharides, disaccharides and polyols) aiming at establishing more benign alternatives to the salts commonly used. The respective ternary phase diagrams were determined at 298 K. The aptitude of the carbohydrates to induce pha ...
DOI:
10.1039/c5gc01610j

13. Facile extraction of cellulose nanocrystals from wood using ethanol and peroxide solvothermal pretreatment followed by ultrasonic nanofibrillation

Author:
Li, Yanna; Liu, Yongzhuang; Chen, Wenshuai; Wang, Qingwen; Liu, Yixing; Li, Jian; Yu, Haipeng
Source:
Green chemistry 2016 v.18 no.4 pp. 1010-1018
ISSN:
1463-9270
Subject:
acid hydrolysis; cellulose; crystal structure; environmental impact; ethanol; green chemistry; hemicellulose; hydrogen peroxide; lignin; lignocellulose; nanocrystals; thermal stability; ultrasonic treatment; ultrasonics; wood; wood flour
Abstract:
... Cellulose nanocrystals (CNCs) were successfully extracted from wood flour by a two-step process that comprised ethanol and peroxide solvothermal pretreatment and an ultrasonic disintegration process. Characterization results showed that 97% of the total lignin and 70% of the hemicellulose could be fractionated in a single ethanosolv pretreatment step. Additional treatment with alkaline hydrogen pe ...
DOI:
10.1039/c5gc02576a

14. Fast, scalable, and eco-friendly fabrication of an energy storage paper electrode

Author:
Koga, Hirotaka; Tonomura, Hidetsugu; Nogi, Masaya; Suganuma, Katsuaki; Nishina, Yuta
Source:
Green chemistry 2016 v.18 no.4 pp. 1117-1124
ISSN:
1463-9270
Subject:
activated carbon; ambient temperature; capacitance; carbon nanotubes; cellulose; chemical treatment; electrodes; electronics; energy; graphene; graphene oxide; green chemistry; paper; papermaking; pulp fiber; research and development; toxic substances; wastes
Abstract:
... Recent progress in portable and wearable electronics has promoted a growing demand for high-performance and flexible energy-storage devices that are abundant and affordable. Because reduced graphene oxide (rGO), originating from inexpensive graphite, serves as a higher-performance energy-storage electrode than conventional activated carbons and carbon nanotubes, research and development of rGO/pol ...
DOI:
10.1039/c5gc01949d

15. Fuel and chemicals from wet lignocellulosic biomass waste streams by hydrothermal carbonization

Author:
Burguete, Pedro; Corma, Avelino; Hitzl, Martin; Modrego, Rubén; Ponce, Estefanía; Renz, Michael
Source:
Green chemistry 2016 v.18 no.4 pp. 1051-1060
ISSN:
1463-9270
Subject:
acid treatment; ash content; biomass; dehydrogenation; drying; energy efficiency; fuels; green chemistry; humidity; hydrochars; hydrothermal carbonization; lignocellulose; limonene; liquids; municipal solid waste; odor compounds; orange peels; pellets; pepper; sulfuric acid
Abstract:
... Most valorization processes for biomass waste require dry raw material or at least a relatively low amount of residual humidity. In contrast, hydrothermal carbonization (HTC) is a valorization process for lignocellulosic biomass which uses water as a reaction medium. The product, hydrochar, can be used as dry solid fuel making the post-process drying procedure much more energy-efficient. Herein, t ...
DOI:
10.1039/c5gc02296g

16. Hydroxyl ammonium ionic liquids as media for biocatalytic oxidations

Author:
Papadopoulou, Athena A.; Tzani, Andromachi; Alivertis, Dimitrios; Katsoura, Maria H.; Polydera, Angeliki C.; Detsi, Anastasia; Stamatis, Haralambos
Source:
Green chemistry 2016 v.18 no.4 pp. 1147-1158
ISSN:
1463-9270
Subject:
Fourier transform infrared spectroscopy; ammonium; anions; biocatalysis; biodegradability; circular dichroism spectroscopy; cytochrome c; decolorization; enzymes; formic acid; green chemistry; hydrogen peroxide; ionic liquids; models; solubilization; spectral analysis; ultraviolet-visible spectroscopy
Abstract:
... In this work, neoteric and biodegradable ionic liquids (ILs) based on various hydroxyl ammonium cations and formic acid anions have been used as media for biocatalytic oxidoreductions catalyzed by different metalloproteins. The effect of these ILs on the biocatalytic behavior and structure of solubilized enzymes was investigated using cytochrome c (cyt c) as a model protein. The use of IL-based me ...
DOI:
10.1039/c5gc02381e

17. Instant high-selectivity Cd-MOF chemosensor for naked-eye detection of Cu(ii) confirmed using in situ microcalorimetry

Author:
Qiao, Chengfang; Qu, Xiaoni; Yang, Qi; Wei, Qing; Xie, Gang; Chen, Sanping; Yang, Desuo
Source:
Green chemistry 2016 v.18 no.4 pp. 951-956
ISSN:
1463-9270
Subject:
aromatic amines; cadmium; calorimetry; color; coordination polymers; copper; crystals; enthalpy; green chemistry; ions; methanol; porous media
Abstract:
... A Cd(ii) metal–organic framework, {NH₂(CH₃)₂·Cd₂.₅(L)₂(H₂O)·(H₂O)}ₙ (1; H₃L = tricarboxytriphenylamine), has been synthesized and features a 3D microporous framework with two different types of 1D channel. Addition of Cu²⁺ to crystals of 1 instantly leads to a clear color change from yellow to dark green crystalline samples (2), which are structurally identified as {NH₂(CH₃)₂₂·Cd₃Cu₂(L)₄(H₂O)₂·(H₂ ...
DOI:
10.1039/c5gc02393a

18. Laccase-catalysed biotransformation of collismycin derivatives. A novel enzymatic approach for the cleavage of oximes

Author:
González-Sabín, Javier; Ríos-Lombardía, Nicolás; García, Ignacio; Vior, Natalia M.; Braña, Alfredo F.; Méndez, Carmen; Salas, José A.; Morís, Francisco
Source:
Green chemistry 2016 v.18 no.4 pp. 989-994
ISSN:
1463-9270
Subject:
biotransformation; carboxylic acids; enzymatic treatment; green chemistry; ketones; laccase; moieties; oxidants; oxidation; oximes; oxygen
Abstract:
... Analogues of the natural product collismycin bearing a carboxylic acid moiety has been efficiently synthesised from several collismycin precursors through a laccase-catalysed oxidation under mild conditions with TEMPO (2,2,6,6-tetramethylpiperidin-1-oxyl) as a mediator and aerial O₂ as an oxidant in aqueous medium. The biotransformations proceeded with excellent yields (85–95%) and involved, depen ...
DOI:
10.1039/c5gc02220g

19. Life cycle assessment of multi-step rufinamide synthesis – from isolated reactions in batch to continuous microreactor networks

Author:
Ott, Denise; Borukhova, Svetlana; Hessel, Volker
Source:
Green chemistry 2016 v.18 no.4 pp. 1096-1116
ISSN:
1463-9270
Subject:
anticonvulsants; azides; benzyl alcohol; bromides; chlorides; cycloaddition reactions; green chemistry; hydrochloric acid; life cycle assessment; moieties; process design; recycling; solvents; triazoles
Abstract:
... Rufinamide is an antiepileptic drug to treat Lennox–Gastaut syndrome, in combination with other medications. Rufinamide is one of the best-selling 5-membered ring heterocyclic pharmaceuticals. Its 1,2,3-triazole moiety is made by click chemistry-based cycloaddition of a dipolarophile and an azide. We have recently shown the feasibility of a continuous solvent- and catalyst-free flow process utiliz ...
DOI:
10.1039/c5gc01932j

20. Meso- and microporous soft templated hydrothermal carbons for dye removal from water

Author:
Alatalo, Sara-Maaria; Mäkilä, Ermei; Repo, Eveliina; Heinonen, Markku; Salonen, Jarno; Kukk, Edwin; Sillanpää, Mika; Titirici, Maria-Magdalena
Source:
Green chemistry 2016 v.18 no.4 pp. 1137-1146
ISSN:
1463-9270
Subject:
adsorbents; adsorption; carbon; ethanol; fructose; green chemistry; hydrothermal carbonization; hypersalinity; methylene blue; pH; pollutants; porosity; porous media; sulfur; washing
Abstract:
... The hydrothermal carbonization (HTC) technique has shown a great ability in the synthesis of carbon materials with special properties for a wide range of different applications. Here, a hypersaline salt mixture (LiCl–ZnCl₂) combined with hydrothermal carbonization was applied in order to obtain sulfur containing micro- and mesoporous (0.3–40 nm) monolithic carbons with high surface areas (400–550 ...
DOI:
10.1039/c5gc01796c