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You searched for: Publication year rev 7998-2002 Remove constraint Publication year rev: 7998-2002 Subject term chemical reactions Remove constraint Subject term: chemical reactions
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1. 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

2. 1,3-Dibromo-2,4,6-trinitrobenzene (DBTNB). Crystal engineering and perfect polar alignment of two-dimensional hyperpolarizable chromophores

Author:
Praveen K. Thallapally; Gautam R. Desiraju; Muriel Bagieu-Beucher; René Masse; Cyril Bourgogne; Jean-François Nicoud
Source:
Chemical communications 2002 v. no.10 pp. 1052-1053
ISSN:
1364-548X
Subject:
chemical compounds; chemical reactions; crystallization; engineering
Abstract:
... 1,3-Dibromo-2,4,6-trinitrobenzene (DBTNB), a two-dimensional charge transfer hyperpolarisable chromophore, crystallises in the non-centrosymmetric space group C2 in perfect polar order leading to an intense powder SHG signal at 1.06 μm. ...
DOI:
10.1039/b201224c

3. 1∶1 Complexes of 5-(4-[N-tert-butyl-N-aminoxyl]phenyl)pyrimidine with manganese(ii) and copper(ii) hexafluoroacetonylacetonate

Author:
Lora M. Field; Paul M. Lahti; Fernando Palacio
Source:
Chemical communications 2002 v. no.6 pp. 636-637
ISSN:
1364-548X
Subject:
chemical reactions; copper; ferrimagnetic materials; manganese; models
Abstract:
... Mn(hfac)₂ and Cu(hfac)₂ form 1∶1 complexes with 5-(4-[N-tert-butyl-N-aminoxyl]phenyl)pyrimidine that exhibit strong metal–nitroxide exchange; spin polarization models do not explain the antiferromagnetic exchange behavior between spin sites in these complexes. ...
DOI:
10.1039/b111295n

4. 2-(1,3-Dithiolan-2-ylidene)-5-(1,3-dithian-2-ylidene)- 1,3,4,6-tetrathiapentalene(DHDA-TTP), a hybrid of BDH-TTP and BDA-TTP, and its metallic cation-radical salts

Author:
Jun-ichi Yamada; Maki Watanabe; Takashi Toita; Hiroki Akutsu; Shin′ichi Nakatsuji; Hiroyuki Nishikawa; Isao Ikemoto; Koichi Kikuchi
Source:
Chemical communications 2002 v. no.10 pp. 1118-1119
ISSN:
1364-548X
Subject:
chemical reactions; electrochemistry; salts
Abstract:
... The synthesis and electrochemical properties of the DHDA-TTP donor, a hybrid of 2,5-bis(1,3-dithiolan-2-ylidene)-1,3,4,6-tetrathiapentalene (BDH-TTP) and 2,5-bis(1,3-dithian-2-ylidene)-1,3,4,6-tetrathiapentalene (BDA-TTP), has been investigated, and its ability to form metallic cation-radical salts is elucidated. ...
DOI:
10.1039/b200556p

5. 3′,4′-trans-Linked bicyclic nucleosides locked in S-type conformations

Author:
Helena Thomasen; Michael Meldgaard; Morten Freitag; Michael Petersen; Jesper Wengel; Poul Nielsen
Source:
Chemical communications 2002 v. no.17 pp. 1888-1889
ISSN:
1364-548X
Subject:
chemical compounds; chemical reactions; models; nucleosides
Abstract:
... A novel class of 3′,4′-trans-linked bicyclic nucleosides with locked S-type furanose conformations is introduced by synthesis of two model derivatives; one was obtained by cyclic ether formation and the other by ring-closing metathesis methodology. ...
DOI:
10.1039/b205031e

6. 4'-Alkoxy derivatives of abscisic acid: a promising new probe for mechanisms of abscisic acid perceptions

Author:
Asami, T.; Min, Y.K.; Han, S.Y.; Kitahata, N.; Oh, K.; Murofushi, N.; Yoshida, S.
Source:
Plant growth regulation 2002 v.38 no.3 pp. 237-241
ISSN:
0167-6903
Subject:
chemical reactions; Hordeum vulgare; biochemical pathways; enzyme inhibitors; bioassays; aleurone cells; structure-activity relationships; gibberellins; abscisic acid; receptors; enzyme activity; synthesis; alpha-amylase
Abstract:
... The preparation of new compounds for exploring the molecular and biochemical mechanisms of abscisic acid signal perception is described. The 4'-carbonyl group of abscisic acid was replaced with either benzyloxy or n-octyloxy groups. Both modified products possessed ABA-like activity in bioassays using barley aleurone protoplasts. The benzyloxy derivative was active in dehydrin induction tests, but ...

7. 5-Azahexenoyl radicals cyclize via nucleophilic addition to the acyl carbon rather than 5-exo homolytic addition at the imine

Author:
Chantal T. Falzon; Ilhyong Ryu; Carl H. Schiesser
Source:
Chemical communications 2002 v. no.20 pp. 2338-2339
ISSN:
1364-548X
Subject:
Lewis bases; carbon; chemical reactions; energy; free radicals; homolytic cleavage; imines
Abstract:
... Molecular orbital calculations predict that the 5-azahexenoyl radical ring closes via nucleophilic addition to the acyl carbon to afford the 5-exo product; CCSD(T)/cc-pVDZ//BHLYP/cc-pVDZ calculations predict energy barriers of 36.1 and 46.9 kJ mol⁻¹ for the exo and endo cyclization modes of the 5-azahexenoyl radical, respectively. ...
DOI:
10.1039/b207729a

8. A C-terminal domain of the membrane copper pump Ctr1 exchanges copper(i) with the copper chaperone Atx1

Author:
Zhiguang Xiao; Anthony G. Wedd
Source:
Chemical communications 2002 v. no.6 pp. 588-589
ISSN:
1364-548X
Subject:
amino acid sequences; chemical reactions; copper; molecular chaperones; yeasts
Abstract:
... A cloned C-terminal domain of the yeast high-affinity copper uptake pump Ctr1 exchanges Cu(i) rapidly with the yeast copper chaperone Atx1: 10⁻² < Kₑₓ < 10⁺². ...
DOI:
10.1039/b111180a

9. A chemo- and stereoselective reduction of cycloalkynes to (E)-cycloalkenes

Author:
Alois Fürstner; Karin Radkowski
Source:
Chemical communications 2002 v. no.18 pp. 2182-2183
ISSN:
1364-548X
Subject:
alkynes; catalytic activity; chemical reactions; stereoselectivity
Abstract:
... A stereoselective entry into (E)-cycloalkenes is described, comprising the ring closing alkyne metathesis (RCAM) of suitable diynes, a ruthenium-catalyzed trans-selective hydrosilylation of the cycloalkynes thus formed, followed by a desilylation of the resulting vinylsilanes mediated by AgF. ...
DOI:
10.1039/b207169j

10. A chiral metallacyclophane for asymmetric catalysis

Author:
Hua Jiang; Aiguo Hu; Wenbin Lin
Source:
Chemical communications 2002 v. no.1 pp. 96-97
ISSN:
1364-548X
Subject:
alcohols; aldehydes; alkynes; catalytic activity; chemical reactions; enantiomers; enantioselectivity
Abstract:
... Chiral metallacyclophanes were self-assembled from cis-(PEt₃)₂PtCl₂ and enantiopure atropisomeric 1,1′-binaphthyl-6,6′-bis(acetylenes) and used in highly enantioselective catalytic diethylzinc additions to aldehydes to afford chiral secondary alcohols. ...
DOI:
10.1039/b208324h

11. A chromophore-labeled poly(N-propargylamide): a new strategy for a stimuli-responsive conjugated polymer

Author:
Ryoji Nomura; Katsuhiro Yamada; Toshio Masuda
Source:
Chemical communications 2002 v. no.5 pp. 478-479
ISSN:
1364-548X
Subject:
chemical reactions; fluorescence; polymers
Abstract:
... A new stimuli-responsive conjugated polymer was synthesized, where, following the change of secondary conformation from helical to disordered state, the fluorescence property of the side chain chromophore changes upon sensing external stimuli. ...
DOI:
10.1039/b111060h

12. A convergent, flexible synthesis of 1,3-dienes

Author:
Marie Lusinchi; Trevor V. Stanbury; Samir Z. Zard
Source:
Chemical communications 2002 v. no.14 pp. 1532-1533
ISSN:
1364-548X
Subject:
chemical reactions; olefin; sulfur dioxide
Abstract:
... 1,3-Dienes were prepared from 1,4-ketoxanthates, obtained by the radical addition reaction of an S-(2-oxoalkyl) xanthate to a terminal olefin, through the DBU induced thermal elimination of sulfur dioxide from the derived 2-sulfolenes. ...
DOI:
10.1039/b203975c

13. A coordination network containing metal–organometallic secondary building units based on π-bonded benzoquinone complexes

Author:
Moonhyun Oh; Gene B. Carpenter; Dwight A. Sweigart
Source:
Chemical communications 2002 v. no.18 pp. 2168-2169
ISSN:
1364-548X
Subject:
benzoquinones; chemical reactions; coordination polymers; dimethyl sulfoxide; ions; manganese; solvents
Abstract:
... In DMSO–MeOH solvent the complex [(η⁴-benzoquinone)Mn(CO)₃]⁻ (QMTC) reacts with Mn²⁺ ions to produce the coordination polymer {Mn₂[(η⁴-benzoquinone)Mn(CO)₃]₄(DMSO)}ₙ, which consists of dimanganese secondary building units interconnected by QMTC spacers. ...
DOI:
10.1039/b206458h

14. A copper(ii) complex of a pentadentate ligand featuring large ferro- and antiferromagnetic interactions

Author:
Christophe Stroh; Raymond Ziessel
Source:
Chemical communications 2002 v. no.17 pp. 1916-1917
ISSN:
1364-548X
Subject:
chemical reactions; copper; ferrimagnetic materials; ferromagnetism; ligands; zinc
Abstract:
... A novel pentadentate ligand based on a 2,2’-bipyridine template and functionalized with two methylene bridged nitroxide arms provides mononuclear Cu(ii) and Zn(ii) complexes displaying a facial and meridional conformation, respectively; for Cu large intramolecular ferromagnetic (J/kB = +173 K) and antiferromagnetic (J′/kB = −170 K) exchange interactions are evidenced from magnetic measurements. ...
DOI:
10.1039/b204899j

15. A dynamic (reversible) covalent polymer: radical crossover behaviour of TEMPO–containing poly(alkoxyamine ester)s

Author:
Hideyuki Otsuka; Koichiro Aotani; Yuji Higaki; Atsushi Takahara
Source:
Chemical communications 2002 v. no.23 pp. 2838-2839
ISSN:
1364-548X
Subject:
chemical reactions; heat; polymers
Abstract:
... A dynamic covalent polymer incorporating thermally alkoxyamine units in the main chain was synthesized. Due to a radical crossover reaction between the alkoxyamine units, an interchange of the main chains in poly(alkoxyamine ester) was observed on heating. ...
DOI:
10.1039/b209193c

16. A facile synthesis of novel types of cyclodextrin derivatives by insertion of an aromatic dicarbonyl spacer into a permethylated α-cyclodextrin skeleton

Author:
Toshiyuki Kida; Takao Michinobu; Wanbin Zhang; Yohji Nakatsuji; Isao Ikeda
Source:
Chemical communications 2002 v. no.15 pp. 1596-1597
ISSN:
1364-548X
Subject:
alpha-cyclodextrin; beta-cyclodextrin; chemical reactions; p-nitrophenol
Abstract:
... Novel types of cyclodextrin derivatives are easily synthesized by the insertion of an aromatic dicarbonyl spacer into the skeleton of permethylated α-cyclodextrin, and the isophthaloyl-inserted one shows almost the same complexing ability toward p-nitrophenol as permethylated β-cyclodextrin. ...
DOI:
10.1039/b204960k

17. A flexible strategy for the divergent modification of pleuromutilin

Author:
Eric Bacqué; François Pautrat; Samir Z. Zard
Source:
Chemical communications 2002 v. no.20 pp. 2312-2313
ISSN:
1364-548X
Subject:
chemical reactions; olefin
Abstract:
... The complex antibacterial natural product, pleuromutilin, can be directly modified by the radical addition reaction of various xanthates to the unactivated terminal olefin present on C-12. ...
DOI:
10.1039/b206568a

18. A fully extended tetrapeptide consisting of natural amino acids

Author:
Henrik Birkedal; Dieter Schwarzenbach; Philip Pattison
Source:
Chemical communications 2002 v. no.23 pp. 2812-2813
ISSN:
1364-548X
Subject:
amino acids; chemical compounds; chemical reactions; peptides
Abstract:
... FGFG is the first example of a non-protected peptide consisting of natural amino acids that adopt a fully extended conformation in the crystalline state. ...
DOI:
10.1039/b208306j

19. A liquid-phase peptide synthesis in cyclohexane-based biphasic thermomorphic systems

Author:
Kazuhiro Chiba; Yusuke Kono; Shokaku Kim; Kohsuke Nishimoto; Yoshikazu Kitano; Masahiro Tada
Source:
Chemical communications 2002 v. no.16 pp. 1766-1767
ISSN:
1364-548X
Subject:
chemical reactions; cyclohexanes; peptides; solvents
Abstract:
... Combinations of typical organic solvents composed of cyclohexane and qualified aprotic polar organic solvents were found to realize an effecitive, biphasic thermomorphic system in arbitrary ratios of upper and lower phases that enable a practical application of a liquid-phase peptide synthesis. ...
DOI:
10.1039/b205156g

20. A mechanistic dehydration study with [2-13C]-DIMBOA

Author:
Huang, H.; Sieler, J.; Sicker, D.
Source:
Journal of natural products 2002 v.65 no.4 pp. 466-469
ISSN:
0163-3864
Subject:
plant pathogens; disease resistance; defense mechanisms; dimboa; synthesis; chemical reactions; biochemical pathways; chemical structure
DOI:
10.1021/np0102455
PubMed:
11975481

21. A model system study of the inhibition of heterocyclic aromatic amine formation by organosulfur compounds

Author:
Shin, H.S.; Strasburg, G.M.; Gray, J.I.
Source:
Journal of agricultural and food chemistry 2002 v.50 no.26 pp. 7684-7690
ISSN:
0021-8561
Subject:
sodium bisulfite; chemical reactions; phenylalanine; creatinine; glucose; heat treatment; quinolines; pyridines; sulfhydryl groups; organic sulfur compounds; volatile compounds
Abstract:
... Organosulfur compounds and sodium bisulfite significantly inhibited (P < 0.05) heterocyclic aromatic amine (HAA) formation in model systems containing phenylalanine, creatinine, and glucose. There was, however, no inhibition by the same compounds in a model system containing only phenylalanine and creatinine. Diallyl disulfide (DAD) and dipropyl disulfide (DPD) concentrations in the model systems ...
DOI:
10.1021/jf025707e
PubMed:
12475289

22. A monomeric selenium(iv) diimide and a dimeric seleninylamine

Author:
Tiina Maaninen; Risto Laitinen; Tristram Chivers
Source:
Chemical communications 2002 v. no.17 pp. 1812-1813
ISSN:
1364-548X
Subject:
amines; chemical reactions; crystallization; selenium
Abstract:
... The selenium(iv) diimide AdNSeNAd (Ad = 1-adamantyl) adopts a monomeric structure with a Z,E configuration in the solid state whereas the seleninylamine OSe(μ-NBuᵗ)₂SeO crystallizes as the cis-dimer. ...
DOI:
10.1039/b205011k

23. A new Zn(ii) coordination polymer with 4-pyridylthioacetate: assemblies of homo-chiral helices with sulfide sites

Author:
Mitsuru Kondo; Makoto Miyazawa; Yasuhiko Irie; Reiko Shinagawa; Tomonori Horiba; Akira Nakamura; Tetsuyoshi Naito; Kenji Maeda; Shunji Utsuno; Fumio Uchida
Source:
Chemical communications 2002 v. no.18 pp. 2156-2157
ISSN:
1364-548X
Subject:
chemical reactions; coordination polymers; moieties; zinc
Abstract:
... A coordination polymer, [Zn(pyta)(OH)] (pyta = 4-pyridylthioacetate), was synthesized and structurally characterized; it is constructed by an alternating assembly of two types of homo-chiral helices, [Zn–OH] and [Zn-pyta], in which the sulfide moieties are fastened in the latter columns. ...
DOI:
10.1039/b205866a

24. A new bis(imidazolyl)(alkylthiolate) tripodal ligand and the spontaneous formation of a disulfide-linked, hydroxo-bridged dinuclear zinc complex

Author:
Vivek V. Karambelkar; Divya Krishnamurthy; Charlotte L. Stern; Lev N. Zakharov; Arnold L. Rheingold; David P. Goldberg
Source:
Chemical communications 2002 v. no.23 pp. 2772-2773
ISSN:
1364-548X
Subject:
chemical reactions; ligands; zinc
Abstract:
... The new sterically encumbered, tripodal N₂S(alkylthiolate) ligand, Lᴵᵐ²Sᴴ, has been synthesized and used to prepare [(Lᴵᵐ²S)ZnCH₃], which upon protonolysis under acidic conditions leads to the synthesis of a novel dinucleating ligand and a zinc dimer with an unusual structure. ...
DOI:
10.1039/b207770a

25. A new catalytic hetero-Heck type reaction

Author:
Juho Helaja; Richard Göttlich
Source:
Chemical communications 2002 v. no.7 pp. 720-721
ISSN:
1364-548X
Subject:
amides; catalytic activity; chemical reactions; palladium
Abstract:
... Unsaturated N-chloroamines have been found to cyclise under palladium-catalysis in good yield, the proposed mechanism includes an oxidative addition of the chloroamine to Pd(0), thus opening a new entry to the amides of the late transition metals. ...
DOI:
10.1039/b201209j

26. A new family of conjugated metallopolymers from electropolymerised bis[(terthiophene)dithiolene] complexes

Author:
Cristina Pozo-Gonzalo; Rory Berridge; Peter J. Skabara; Elena Cerrada; Mariano Laguna; Simon J. Coles; Michael B. Hursthouse
Source:
Chemical communications 2002 v. no.20 pp. 2408-2409
ISSN:
1364-548X
Subject:
absorption; chemical reactions; nickel; terthiophenes
Abstract:
... Bis(dithiolene) metal complexes incorporating fused terthiophene units have been prepared; the nickel analogue undergoes electropolymerisation to afford a low bandgap material with very broad absorption characteristics. ...
DOI:
10.1039/b206243g

27. A new material for selective removal of nitrogen compounds from gasoils towards more efficient HDS processes

Author:
Mathieu Macaud; Emmanuelle Schulz; Michel Vrinat; Marc Lemaire
Source:
Chemical communications 2002 v. no.20 pp. 2340-2341
ISSN:
1364-548X
Subject:
chemical reactions; nitrogen compounds; sorbents
Abstract:
... A selective removal of nitrogen compounds from gasoils is proposed, using a recyclable sorbent capable of forming charge-transfer complexes;1 the selective elimination of nitrogen compounds strongly improves the hydrodesulfurization (HDS) of denitrogenated feed. ...
DOI:
10.1039/b206222b

28. A new method for the synthesis of hydrophobized, catalytically active Pt nanoparticles

Author:
Saikat Mandal; PR. Selvakannan; Debdut Roy; Raghunath V. Chaudhari; Murali Sastry
Source:
Chemical communications 2002 v. no.24 pp. 3002-3003
ISSN:
1364-548X
Subject:
chemical compounds; chemical reactions; hydrophobicity; ions; liquid-liquid interface; nanoparticles
Abstract:
... A single step method for the synthesis of catalytically active, hydrophobic Pt nanoparticles by the spontaneous reduction of aqueous PtCl₆²⁻ ions by hexadecylaniline molecules at a liquid–liquid interface is described. ...
DOI:
10.1039/b209050c

29. A new strategy towards the total synthesis of phenanthridone alkaloids: synthesis of (+)-2,7-dideoxypancratistatin as a model study

Author:
Ganesh Pandey; Andiappan Murugan; Madhesan Balakrishnan
Source:
Chemical communications 2002 v. no.6 pp. 624-625
ISSN:
1364-548X
Subject:
alkaloids; aromatic compounds; chemical reactions; models
Abstract:
... A new strategy towards the synthesis of phenanthridone alkaloids has been reported through the synthesis of (+)-2,7-dideoxypancratistatin from D-(−)-quinic acid employing PET initiated carbocyclization of an electron rich aromatics by silylenol ether as a key step. ...
DOI:
10.1039/b200624c

30. A new supramolecular isomer of [Zn(nicotinate)₂]ₙ: a novel 4².8⁴ network that is the result of self-assembly of 4-connected nodes

Author:
Beth Rather; Brian Moulton; Rosa D. Bailey Walsh; Michael J. Zaworotko
Source:
Chemical communications 2002 v. no.7 pp. 694-695
ISSN:
1364-548X
Subject:
chemical reactions; isomers; niacin
Abstract:
... Self-assembly of Zn(NO₃)₂ with m-pyridinecarboxylate (nicotinate) under mild conditions affords several products including a novel three-dimensional network [Zn(nicotinate)₂]ₙ that has connectivity defined by the circuit symbol 4².8⁴. ...
DOI:
10.1039/b111280p

31. A new synthesis of phosphoramidates: inhibitors of the key bacterial enzyme aspartate semi-aldehyde dehydrogenase

Author:
Luke A. Adams; Russell J. Cox; Jennifer S. Gibson; M. Belén Mayo-Martín; Magnus Walter; William Whittingham
Source:
Chemical communications 2002 v. no.18 pp. 2004-2005
ISSN:
1364-548X
Subject:
aspartic acid; bacterial enzymes; carboxylic acids; chemical reactions; potassium; salts
Abstract:
... A new, mild and high yielding synthesis of phosphoramidates is described: potassium salts of carboxylic acids are treated with ethylchloroformate and the resulting activated anhydride-carbonates are then treated with LiNHP(O)(OEt)₂in situ—the methodology is especially suited to acid sensitive systems featuring BOC, ᵗBu or acetal protecting groups. ...
DOI:
10.1039/b206199f

32. A new synthetic method to Mn carboxylate clusters: reductive fragmentation of [Mn₁₂O₁₂(O₂CR)₁₆(H₂O)₄] to [Mn₈O₂(O₂CR)₁₄(RCO₂H)₄] (R = CH₂Buᵗ)

Author:
Colette Boskovic; John C. Huffman; George Christou
Source:
Chemical communications 2002 v. no.21 pp. 2502-2503
ISSN:
1364-548X
Subject:
chemical reactions; crystallization; manganese; methylene chloride; reducing agents
Abstract:
... The reaction of [Mn₁₂O₁₂(O₂CCH₂Buᵗ)₁₆(H₂O)₄] (1) with a reducing agent followed by recrystallization from CH₂Cl₂/MeNO₂ affords the novel octanuclear complex [Mn₈O₂(O₂CCH₂Buᵗ)₁₄(BuᵗCH₂CO₂H)₄] (2). ...
DOI:
10.1039/b206751j

33. A novel C–C bond formation reaction with 1-methoxymethylindolylborate

Author:
Minoru Ishikura; Hiromi Kato; Nobuyuki Ohnuki
Source:
Chemical communications 2002 v. no.3 pp. 220-221
ISSN:
1364-548X
Subject:
Lewis acids; benzaldehyde; chemical bonding; chemical reactions; indoles
Abstract:
... The reaction of 1-methoxymethylindolylborates 2 with electrophiles in the presence of benzaldehyde enabled the novel construction of tri-substituted indoles in a ‘one-pot’ procedure. ...
DOI:
10.1039/b109880b

34. A novel fully conjugated phenanthroline-appended phthalocyanine: synthesis and characterisation

Author:
Julia Rusanova; Melanie Pilkington; Silvio Decurtins
Source:
Chemical communications 2002 v. no.19 pp. 2236-2237
ISSN:
1364-548X
Subject:
chemical compounds; chemical reactions; nuclear magnetic resonance spectroscopy; ultraviolet-visible spectroscopy
Abstract:
... The synthetic route to a new fully conjugated phenanthroline appended phthalocyanine is described. This compound has been fully characterised by elemental analysis, UV–VIS, IR, MS and ¹H NMR spectroscopy. ...
DOI:
10.1039/b206973c

35. A novel organometallic columnar complex containing endohedral silver(i)–ethynediyl binding and exterior silver(i)–aromatic interaction

Author:
Quan-Ming Wang; Thomas C. W. Mak
Source:
Chemical communications 2002 v. no.22 pp. 2682-2683
ISSN:
1364-548X
Subject:
chemical reactions; polymers; quaternary ammonium compounds; silver
Abstract:
... Unprecedented η³ π-donor behavior of the benzyltrimethylammonium ion is observed in the polymeric silver(i) complex [(PhCH₂NMe₃)Ag₇(C₂)(CF₃CO₂)₆]ₙ that comprises a columnar backbone constructed from the fusion of Ag₈ square antiprisms each enclosing an acetylide dianion. ...
DOI:
10.1039/b208298e

36. A novel piezo-optical styrene sensor incorporating polymer-supported tribromide ion

Author:
Kelly R. Bearman; David C. Blackmore; Timothy J. N. Carter; Florence Colin; John D. Wright; Steven A. Ross
Source:
Chemical communications 2002 v. no.9 pp. 980-981
ISSN:
1364-548X
Subject:
chemical reactions; encapsulation; indium tin oxide; polyethylene glycol; styrene; thermoplastics; vapors
Abstract:
... Encapsulation of Amberlyst® A-26 supported tribromide in a 10,000 MW polyethylene glycol matrix gives a robust colour-sensitive reagent matrix which can be deposited on indium–tin oxide coated polyvinylidene fluoride (PVDF) piezoelectric film for the detection of styrene (and other alkene) vapours. ...
DOI:
10.1039/b202200a

37. A novel precursor for synthesis of pure boron nitride nanotubes

Author:
Chengchun Tang; Yoshio Bando; Tadao Sato; Keiji Kurashima
Source:
Chemical communications 2002 v. no.12 pp. 1290-1291
ISSN:
1364-548X
Subject:
boron nitride; chemical reactions; magnesium; magnesium oxide; nanotubes; transmission electron microscopes
Abstract:
... A novel precursor, a mixture of B₂O₂ and Mg which is generated in situ by reacting B and MgO at 1300 °C, can be used to effectively synthesize bulk amounts of pure BN nanotubes with Mg evaporated from the final product; transmission electron microscope observation for the synthesized BN nanotubes indicates that defects present strongly depend on the tube diameter. ...
DOI:
10.1039/b202177c

38. A novel scoop-shaped conformation of C-methylcalix[4]resorcinarene in a bilayer structure

Author:
Bao-Qing Ma; Philip Coppens
Source:
Chemical communications 2002 v. no.5 pp. 424-425
ISSN:
1364-548X
Subject:
chemical compounds; chemical reactions; chemical structure; phenylalanine
Abstract:
... A new scoop-shaped conformation of C-methylcalix[4]resorcinarene has been identified; it is a hybrid of the previously observed crown- and flattened cone conformations. ...
DOI:
10.1039/b110193p

39. A novel synthetic route to fused propenochlorin and benzochlorin photodynamic therapy probes

Author:
Guolin Li; Ricky Mehta; Thamarapu Srikrishnan; Daniel J. Nurco; Walter A. Tabaczynski; James L. Alderfer; Kevin M. Smith; Thomas J. Dougherty; Ravindra K. Pandey
Source:
Chemical communications 2002 v. no.11 pp. 1172-1173
ISSN:
1364-548X
Subject:
aromatic compounds; chemical reactions; moieties; photochemotherapy; sulfuric acid
Abstract:
... Reaction of meso-(2-formylvinyl)octaethylporphyrin with (CH₃)₃SiCN–Cu(OTf)₂ produced unexpected 10³-trimethylsiloxyl and 10³-hydroxyl fused propenochlorins which, in H₂SO₄, underwent subsequent migration of the 8-ethyl group to the 10³-position of the exocyclic benzene ring to form a novel benzochlorin. ...
DOI:
10.1039/b202280j

40. A novel two-dimensional mixed molybdenum–vanadium polyoxometalate with two types of cobalt(ii) complex fragments as bridges

Author:
Cai-Ming Liu; De-Qing Zhang; Ming Xiong; Dao-Ben Zhu
Source:
Chemical communications 2002 v. no.13 pp. 1416-1417
ISSN:
1364-548X
Subject:
anions; chemical reactions; cobalt; ethylenediamines
Abstract:
... A heterometallic polyoxometalate [Co(en)₂][Co(bpy)₂]₂[PMoⱽᴵ₅Moⱽ₃Vᴵⱽ₈O₄₄]·4.5H₂O (en = ethylenediamine, bpy = 2,2′-bipyridine) 1, has been hydrothermally synthesized, which is the first example of a two-dimensional framework where polyoxometalate anions are linked by two types of complex fragments. ...
DOI:
10.1039/b202540j

41. A parity code interpretation of nucleotide alphabet composition

Author:
Dónall A. Mac Dónaill
Source:
Chemical communications 2002 v. no.18 pp. 2062-2063
ISSN:
1364-548X
Subject:
chemical compounds; chemical reactions; hydrogen
Abstract:
... The purine–pyrimidine and hydrogen donor–acceptor patterns governing nucleotide recognition are shown to correspond formally to a digital error-detecting (parity) code, suggesting that factors other than physicochemical issues alone shaped the natural nucleotide alphabet. ...
DOI:
10.1039/b205631c

42. A potassium selective ‘nanosponge’ with well defined pores

Author:
Achim Müller; Bogdan Botar; Hartmut Bögge; Paul Kögerler; Alois Berkle
Source:
Chemical communications 2002 v. no.24 pp. 2944-2945
ISSN:
1364-548X
Subject:
cations; chemical reactions; encapsulation; potassium
Abstract:
... The novel spherical cluster-compound K₂Na₆[K₂₀ ⊂ Mo₈₀V₂₂O₂₈₂(SO₄)₁₂(H₂O)₆₆]·≈140H₂O 1 has been obtained in a ‘one-pot’ reaction and exhibits several remarkable structural features: 30 open shell centers, i.e. 8 Moⱽ and 22 Vᴵⱽ spanning an icosidodecahedron, the incorporation of 20 K⁺ cations capping 20 appropriate {M₆O₆} pores/rings present at the surface of the spherical cluster-anion, and an enca ...
DOI:
10.1039/b210523n

43. A rare ether-bridged cobalt complex which gives rise to an unusual ‘serpentine’ metal–ligand binding motif

Author:
Garry Mund; Andrea J. Gabert; Raymond J. Batchelor; James F. Britten; Daniel B. Leznoff
Source:
Chemical communications 2002 v. no.24 pp. 2990-2991
ISSN:
1364-548X
Subject:
chemical reactions; cobalt; ligands
Abstract:
... An unusual metal–ligand binding motif is found in dimeric cobalt(ii) complexes coordinated by diamidoether ligands that bridge the metals in a ‘serpentine’ fashion through the ether donors of the ligand backbone rather than the amido groups. ...
DOI:
10.1039/b208221g

44. A reversible resistivity-based nitric oxide sensor

Author:
Takeshi Shioya; Timothy M. Swager
Source:
Chemical communications 2002 v. no.13 pp. 1364-1365
ISSN:
1364-548X
Subject:
chemical reactions; cobalt; ligands; nitric oxide
Abstract:
... A sensor for nitric oxide is reported that uses a novel redox matching mechanism to induce a resistance change upon binding this important ligand to cobalt. ...
DOI:
10.1039/b203019e

45. A ring expansion reaction of 1,3-oxathiolanes

Author:
Maria Ioannou; Michael J. Porter; Fabienne Saez
Source:
Chemical communications 2002 v. no.4 pp. 346-347
ISSN:
1364-548X
Subject:
catalysts; chemical reactions; copper; sulfur
Abstract:
... 1,3-Oxathiolanes are efficiently converted, via sulfur ylide intermediates, to 1,4-oxathianes by ring expansion with a silylated diazoacetate in the presence of a copper catalyst. ...
DOI:
10.1039/b110754b

46. A rodlike organogelator: fibrous aggregation of azobenzene derivatives with a syn-chiral carbonate moiety

Author:
Jun-ichi Mamiya; Kiyoshi Kanie; Tamejiro Hiyama; Tomiki Ikeda; Takashi Kato
Source:
Chemical communications 2002 v. no.17 pp. 1870-1871
ISSN:
1364-548X
Subject:
carbonates; chemical reactions; moieties; solvents
Abstract:
... A chiral azobenzene derivative containing a cyclic syn-carbonate moiety functions as a gelator for various organic solvents; the dipole-dipole interaction drives the fibrous self-assembly of the rodlike gelator. ...
DOI:
10.1039/b205072b

47. A selective colorimetric anion sensor based on an amide group containing macrocycle

Author:
Piotr Piątek; Janusz Jurczak
Source:
Chemical communications 2002 v. no.20 pp. 2450-2451
ISSN:
1364-548X
Subject:
acetates; chemical reactions; colorimetry; fluorides
Abstract:
... A new colorimetric anion sensor 4 allows for selective ‘naked-eye’ differentiation of F⁻, AcO⁻ and H₂PO₄⁻ with similar basicity. ...
DOI:
10.1039/b207335h

48. A stable metal coordination polymer gel based on a calix[4]arene and its “uptake” of non-ionic organic molecules from the aqueous phase

Author:
Bengang Xing; Ming-Fai Choi; Bing Xu
Source:
Chemical communications 2002 v. no.4 pp. 362-363
ISSN:
1364-548X
Subject:
aromatic hydrocarbons; chemical reactions; coordination polymers; gelation; organogels
Abstract:
... Here we report a coordination polymer based, stable organogel (termed ‘metallogel’ to emphasize the essential role of metal–ligand bonding during the gelation), which ‘uptakes’ neutral organic molecules from the aqueous phase. ...
DOI:
10.1039/b111245g

49. A three-dimensional nanoporous flexible network of ‘square-planar’ copper(ii) centres with an unusual topology

Author:
Lucia Carlucci; Nicola Cozzi; Gianfranco Ciani; Massimo Moret; Davide M. Proserpio; Silvia Rizzato
Source:
Chemical communications 2002 v. no.13 pp. 1354-1355
ISSN:
1364-548X
Subject:
chemical reactions; copper; nanopores; porous media; solvents; topology
Abstract:
... Cu(ii) triflate reacts with 4,4′-bipyridyl in different solvents to yield the new 3D network [Cu(4,4′-bipy)₂(CF₃SO₃)₂], based on pseudo-square planar nodes and consisting of crossing layers of large rhombic meshes (22 × 22 Å) fused together into an overall (two-fold interpenetrated) array, with a topology unprecedented within coordination frames and an interesting nanoporous behaviour. ...
DOI:
10.1039/b202588d

50. A total synthesis of phomactin A

Author:
William P. D. Goldring; Gerald Pattenden
Source:
Chemical communications 2002 v. no.16 pp. 1736-1737
ISSN:
1364-548X
Subject:
aldehydes; chemical reactions; chromium; nickel; organoiodine compounds
Abstract:
... A total synthesis of phomactin A (1) based on a Cr(ii)/Ni(ii) macrocyclisation from the aldehyde vinyl iodide 11, leading to 12, followed by elaboration of the epoxyketone 16, which then undergoes spontaneous pyran-hemiacetal formation on deprotection, is described. ...
DOI:
10.1039/b206041h