Chemoselective Oxidation of Sulfides to Sulfoxides Using<i>N</i>-<i>t</i>-Butyl-<i>N</i>-chlorocyanamide
作者:Vinod Kumar、Mahabir Parshad Kaushik
DOI:10.1246/cl.2005.1230
日期:2005.9
A simple, efficient and highly chemoselective method has been developed for the synthesis of sulfoxides from sulfides using N-t-butyl-N-chlorocyanamide as an oxidant in a mixed acetonitrile–water solution with a 1:1 mol ratio of oxidant to sulfides. N-t-butyl-N-chlorocyanamide, a source of positive chlorine, has been used for conversion of the variety of sulfides into their corresponding sulfoxides in quantitative yields.
Carbonate pyrolysis. Part 5. The gas-phase pyrolysis of some unsymmetrical monothiolcarbonates and a rationalisation of the rates of some related reactions
作者:Nouria Al-Awadi、David B. Bigley
DOI:10.1039/p29790000497
日期:——
Thiolcarbonates pyrolyse more slowly than carbonates. Where the sulphur atom is attached to the group which will form the olefin, this difference amounts to three orders of magnitude; when the sulphur atom is in the other ether position it is only ten-fold. These rate changes are discussed in terms of similar substitutions in thioacetates.
A general strategy for elaboration of the dithiocarbonyl functionality, -(C:O)SS-: application to the synthesis of bis(chlorocarbonyl)disulfane and related derivatives of thiocarbonic acids
作者:George Barany、Alayne L. Schroll、Andrew W. Mott、David A. Halsrud
DOI:10.1021/jo00172a056
日期:1983.12
BARANY, G.;SCHROLL, A. L.;MOTT, A. W.;HALSRUD, D. A., J. ORG. CHEM., 1983, 48, N 24, 4750-4761
作者:BARANY, G.、SCHROLL, A. L.、MOTT, A. W.、HALSRUD, D. A.
DOI:——
日期:——
The mechanism of thermal eliminations. Part 15. Abnormal rate spread in pyrolysis of alkyl methyl carbonates and S-alkyl O-methyl carbonates due to enhanced nucleophilicity of the carbonyl group
作者:Roger Taylor
DOI:10.1039/p29830000291
日期:——
polarity of the transitionstate in ester pyrolysis upon the importance of carbonyl group nucleophilicity, and this also accounts for the relative reactivities of thiol-, thion-, and dithio-acetates. Steric acceleration appears less important for carbonates than for acetates, since the rate for di-t-butyl carbonate (statistically corrected) is lower than for t-butyl methyl carbonate, whereas pivalates