Showing papers in "Journal of The Chemical Society, Chemical Communications in 1984"
TL;DR: In this paper, the properties of α-quartz and the structures of other polymorphs of SiO2 were modeled using interatomic potentials, which include bond-bending terms.
Abstract: Interatomic potentials, which include bond-bending terms, allow us to model accurately the properties of α-quartz and the structures of other polymorphs of SiO2.
506 citations
TL;DR: The Re(bipy)(CO)3Cl (Bipy = 2,2′-bipyridine) is an efficient homogeneous catalyst for the selective and sustained electrochemical reduction of CO2 to CO at low potential.
Abstract: Re(bipy)(CO)3Cl (bipy = 2,2′-bipyridine) is an efficient homogeneous catalyst for the selective and sustained electrochemical reduction of CO2 to CO at low potential.
477 citations
TL;DR: In this article, the Heck-type reactions involving organic halides proceed readily at or near room temperature when performed under solid-liquid phase transfer conditions, and they are shown to be stable at room temperature.
Abstract: Heck-type reactions involving organic halides proceed readily at or near room temperature when performed under solid–liquid phase transfer conditions.
338 citations
TL;DR: In this paper, the selectivity for reduction of CO2vs. that of H2O is huge, even in pure water, in the presence of NiII(Cyclam) 2+ +.
Abstract: Co2is electroreduced efficiently to CO on a mercury cathode, in the presence [NiII(Cyclam)]2+; even in pure water, the selectivity for reduction of CO2vs. that of H2O is huge.
291 citations
TL;DR: The phenyldimethylsilyl group can be converted in two steps, protodesilylation and peracid-mediated rearrangement, into a hydroxy group with retention of configuration as discussed by the authors.
Abstract: The phenyldimethylsilyl group can be converted in two steps, protodesilylation and peracid-mediated rearrangement, into a hydroxy group with retention of configuration: β-phenyldimethylsilyl carbonyl compounds are thus revealed to be masked aldol products.
280 citations
TL;DR: In this paper, electron transfer from the conduction band of CdS to that of TiO2 particles occurs in alkaline suspensions containing SH- ions and is exploited to improve the performance of a system that decomposes H2S with visible light.
Abstract: Electron transfer from the conduction band of CdS to that of TiO2 particles occurs in alkaline suspensions containing SH– ions and is exploited to improve the performance of a system that decomposes H2S with visible light.
246 citations
TL;DR: The assignment of structure (1) to the major neurotoxin, lolitrem B, is based on its spectroscopic properties, particularly a detailed structure of its high-field 1H and 13C n.m.r. spectra, as well as chemical evidence.
Abstract: The lolitrems, tremorgenic neurotoxins from perennial ryegrass, are implicated in ryegrass staggers disorder in livestock; the assignment of structure (1) to the major neurotoxin, lolitrem B, is based on its spectroscopic properties, particularly a detailed structure of its high-field 1H and 13C n.m.r. spectra, as well as chemical evidence.
214 citations
TL;DR: N-Substituted aziridines are formed by Fe- or Mn-Porphyrin catalysed reactions of PhlNR compounds (R = tosyl or COCF7) with alkenes; the stereochemical characteristics of these reactions are very different from those of the analogous epoxidation of theAlkenes by PhlO.
Abstract: N-Substituted aziridines are formed by Fe- or Mn-Porphyrin catalysed reactions of PhlNR compounds (R = tosyl or COCF7) with alkenes; the stereochemical characteristics of these reactions are very different from those of the analogous epoxidation of the alkenes by PhlO.
183 citations
TL;DR: Meso-tetra(2,6-dichlorophenyl)porphinatoiron(III)chloride and meso-toetra (pentachlorphenyl) porphinatioiron(II) chloride were found to be unusually efficient catalysts for high-turnover, high-yield epoxidation and alkane hydroxylation.
Abstract: Meso-tetra(2,6-dichlorophenyl)porphinatoiron(III)chloride and meso-tetra(pentachlorophenyl)porphinatioiron(III)chloride, which resist µ-oxo dimmer formation and oxidative destruction, are found to be unusually efficient catalysts for high-turnover, high-yield alkene epoxidation and alkane hydroxylation.
167 citations
TL;DR: The electrochemical polymerization of pyrrole on a platinum electrode covered with a film of poly(vinyl chloride) produces a dark brown, ductile, and flexible composite polymer film with an electrical conductivity comparable to polypyrrole, and mechanical properties very simllar to poly(vineyl chloride as mentioned in this paper.
Abstract: The electrochemical polymerization of pyrrole on a platinum electrode covered with a film of poly(vinyl chloride) produces a dark brown, ductile, and flexible composite polymer film with an electrical conductivity comparable to polypyrrole, and mechanical properties very simllar to poly(vinyl chloride).
136 citations
TL;DR: One-to-one inclusion complexes were obtained in crystalline state in high yield by the treatment of β-and γ-cyclodextrin (CD) with ferrocene (FcH) and its derivatives as discussed by the authors.
Abstract: One-to-one inclusion complexes were obtained in crystalline state in high yield by the treatment of β-and γ-cyclodextrin (CD)with ferrocene (FcH) and its derivatives (FcR), while α-cyclodextrin formed 2:1 [CD:FcR (FcH)] complexes with ferrocene and the monosubstituted derivatives.
TL;DR: In this paper, the high-field (9.4 T)29Si m.a.s. n.r. spectrum of highly siliceous ZSM-5 (silicalite) shows that changes in the zeolite structure occur when sorbate molecules are present; these changes occur at low loading levels and are characteristic of the nature of the sorbed molecules.
Abstract: The high-field (9.4 T)29Si m.a.s. n.m.r. spectrum (m.a.s. = magic angle spinning) of highly siliceous ZSM-5 (silicalite) shows that changes in the zeolite structure occur when sorbate molecules are present; these changes occur at low loading levels and are characteristic of the nature of the sorbed molecules, and X-ray diffraction confirms that the effect is a perturbation of the zeolite structure itself.
TL;DR: Chiral dioxirane intermediates, which are formed in the reaction of potassium peroxomonosulphate with chiral ketones, allow the epoxidation of simple pro-chiral olefins to the corresponding epoxides to be carried out with enantiomeric excesses in the range 9-12.5% as mentioned in this paper.
Abstract: Chiral dioxirane intermediates, which are formed in the reaction of potassium peroxomonosulphate with chiral ketones, allow the epoxidation of simple pro-chiral olefins to the corresponding epoxides to be carried out with enantiomeric excesses in the range 9–12.5%.
TL;DR: The electrochemical polymerization of pyrrole on an electrode coated with an insulating polymer film produces electrically conducting polymer alloys of the insulating polymeric and polypyrrole as mentioned in this paper.
Abstract: The electrochemical polymerization of pyrrole on an electrode coated with an insulating polymer film produces electrically conducting polymer alloys of the insulating polymer and polypyrrole.
TL;DR: In this paper, a porphyrin pyrrole has been ringexpanded to a morpholine derivative, ring-contracted to an azetine derivative, and converted into the oxazolone derivatives.
Abstract: Novel heterocyclic systems in which a porphyrin pyrrole has been ring-expanded to a morpholine derivative (5), ring-contracted to an azetine derivative (6), and converted into the oxazolone derivatives (4) and (9) result from selective oxidation of 2-amino-5,10,15,20-tetraphenylporphyrin (1).
TL;DR: In this article, platinized colloidal cadmium sulphide was generated in situ in Aerosol-OT reversed micelle entrapped water pools in iso-octane sensitized water photoreduction by thiophenol, dissolved in the organic phase.
Abstract: Irradiation of platinized colloidal cadmium sulphide, generated in situ in Aerosol-OT reversed micelle entrapped water pools in iso-octane sensitized water photoreduction by thiophenol, dissolved in the organic phase.
TL;DR: Glycosyl fluorides react with a variety of O-, S-, and N-nucleophiles to afford the corresponding glycosides in good to excellent yields as discussed by the authors.
Abstract: Glycosyl fluorides react with a variety of O-, S-, and N-nucleophiles to afford the corresponding glycosides in good to excellent yields.
TL;DR: Treatment of p-t-butyl-calix[4]arene (1) with tbutyl bromoacetate in tetrahydrofuran-N,N-dimethylfromamide gives, after hydrolysis, a tetracarboxylic acid which exists in a cone structure with an enforced hydrophobic cavity, and whose alkali and ammonium salts are soluble in water.
Abstract: Treatment of p-t-butyl-calix[4]arene (1) with t-butyl bromoacetate in tetrahydrofuran–N,N-dimethylfromamide gives, after hydrolysis, a tetracarboxylic acid which exists in a cone structure with an enforced hydrophobic cavity, and whose alkali and ammonium salts are soluble in water.
TL;DR: The reactive organometallic trifluoromethanesulphonato (CF3SO3-) complex has been used as a basis for the synthesis of the series of complexes fac-Re(bpy)(CO)3X (X = H, O2CH, and O2COH) all of which are involved in the reduction of CO2 as discussed by the authors.
Abstract: The reactive organometallic trifluoromethanesulphonato (CF3SO3–) complex fac-Re(bpy)(CO)3CF3SO3(bpy = 2,2′-bipyridine) has neen used as a basis for the synthesis of the series of complexes fac-Re(bpy)(CO)3X (X = H, O2CH, and O2COH) all of which are involved in the reduction of CO2; the hydrido complex has been found to undergo a slow thermal reaction with CO2 to give the formato complex, a reaction which is greatly enhanced by visible light.
TL;DR: Pancratium littorale Jacq collected in Hawaii has been found to produce a new phenanthridone, pancratistatin, that significantly inhibits growth of the murine P388 lymphocytic leukaemia as mentioned in this paper.
Abstract: Pancratium littorale Jacq. Collected in Hawaii has beenfound to produce a new phenanthridone, pancratistatin, that significantly inhibits growth of the murine P388 lymphocytic leukaemia; an X-ray crystal structure determination of pancratistatin monomethyl ether (1c) was employed to assign structure (1a) to pancratistatin.
TL;DR: In this paper, it was shown that the symmetry change between monoclinic and orthohombic nature, exhibited in ZSM-5 zeolite, depends not only on the aluminium concentration and the presence of sorbate molecules, but also on the temperature of the sample.
Abstract: X-Ray diffraction experiments have shown that the framework symmetry change between monoclinic and orthohombic nature, exhibited in ZSM-5 zeolite depends not only on the aluminium concentration and on the presence of sorbate molecules, but also on the temperature of the sample.
TL;DR: The reaction of MgClR(OEt2)[R = CH(SiMe3)2] with GeCl2· dioxane in OEt2 yields the bright yellow crystalline Ge2R4 as discussed by the authors, which behaves chemically as a singlet germylene eR2.
Abstract: Reaction of MgClR(OEt2)[R = CH(SiMe3)2] with GeCl2· dioxane in OEt2 yields the bright yellow crystalline Ge2R4[having a trans-folded C2h Ge2C4 framework with a fold angle of 32°, a germanium environment intermediate between pyramidal and planar (sum of angles at Ge = 348°) and a GeGe bond length of 2.347(2)A(ca. 4% shorter than in elemental germanium)], which behaves chemically as a singlet germylene eR2.
TL;DR: The assignment of structure to fusarin C, a mutagen isolated from cultures of Fusarium moniliforme, is based on a detailed study of its high-field 1H and 13C n.m. spectra and X-ray crystallography of the 8Z isomer of (1) which defined the substitution pattern and relative configuration of the 2-pyrrolidone moiety as discussed by the authors.
Abstract: The assignment of structure (1) to fusarin C, a mutagen isolated from cultures of Fusarium moniliforme is based on a detailed study of its high-field 1H and 13C n.m.r. spectra and X-ray crystallography of the 8Z isomer of (1) which defined the substitution pattern and relative configuration of the 2-pyrrolidone moiety; nuclear Overhauser enhancement experiments indicate that the 2E,4E,6E,8E,10E polyene chromophore of (1) exists in solution as an equilibrium between two conformers with s-cis and s-trans topology of the C-5–C-6 single bond.
TL;DR: Arylmalononitriles are prepared in good yields using a palladium-catalysed coupling reaction between aryl halides and malononitrile.
Abstract: Arylmalononitriles are prepared in good yields using a palladium-catalysed coupling reaction between aryl halides and malononitrile.
TL;DR: In this article, the main reaction pathway from aromatic electrophilic to aliphatic nucleophilic substitution was changed by sonication of a mixture of benzyl bromide, potassium cyanide, and alumina.
Abstract: Ultrasonic irradiation of a mixture of benzyl bromide, potassium cyanide, and alumina in an aromatic solvent yields benzyl cyanide, whereas mechanical agitation gives the Friedel–Crafts type product; sonication changes the main reaction pathway from aromatic electrophilic to aliphatic nucleophilic substitution.
TL;DR: The currently accepted mechanism for decarboxylative transamination of α-amino acids is shown to be incorrect in this article, where the intervention of 1,3-dipolar species in the decarreboxylation is demonstrated by trapping with a range of dipolarophiles.
Abstract: The currently accepted mechanism for decarboxylative transamination is shown to be incorrect; the intervention of 1,3-dipolar species in the decarboxylative transamination of α-amino acids is demonstrated by trapping with a range of dipolarophiles.
TL;DR: The structure of HSO5, the active component in Caro's acid, in the title compound, and in the triple salt K5(HSO5)2 (HSO4)(SO4), has been determined and the location of the proton on the peroxo group established.
Abstract: The structure of HSO5–, the active component in Caro's acid, in the title compound, and in the triple salt K5(HSO5)2(HSO4)(SO4), has been determined and the location of the proton on the peroxo group established.
TL;DR: Pyridoxal is shown to react in an analogous fashion to α-amino acid decarboxylases and can be trapped both inter- and intra-molecularly to give bridgehead-nitrogen and spirocycli products in goood yield.
Abstract: N-Substituted and α,α-disubstituted amino acids react with carbonyl compounds to generate 1,3-dipolar species under mild conditions mimicking α-amino acid decarboxylases; the 1,3-dipoles can be trapped both inter- and intra-molecularly to give bridgehead-nitrogen and spirocycli products in goood yield; pyridoxal is shown to react in an analogous fashion.
TL;DR: The conducting organic salt N-methylphenazinium tetracyanoquinodimethanide can be used as an electrode for the oxidation of NADH at a sufficiently rapid rate to be a good detector in an enzyme coupled sensor as mentioned in this paper.
Abstract: The conducting organic salt N-methylphenazinium tetracyanoquinodimethanide can be used as an electrode for the oxidation of NADH at a sufficiently rapid rate to be a good detector in an enzyme coupled sensor.
TL;DR: In this article, the locations of the hydrogen atoms in lanthanum zeolite-Y (Si/Al = 2.61) were revealed by neutron diffraction.
Abstract: Neutron diffraction studies on a partially dehydrated sample of lanthanum zeolite-Y (Si/Al = 2.61) reveal the locations of the hydrogen atoms, thus providing direct evidence for the cation hydrolysis and Bronsted acidity that account, tn part, for the catalytic activity of this faujasite zeolite.