Effect of substitution of oxygen by sulfur in the nonleaving group of a carbonate: kinetics of the phenolysis and benzenethiolysis of<i>S</i>-methyl aryl thiocarbonates
作者:Enrique A. Castro、Margarita Aliaga、José G. Santos
DOI:10.1002/poc.1192
日期:2007.8
are studied kinetically. The Brønsted plots (log kNversus nucleophilebasicity) are linear for all reactions. The Brønsted slopes for 1 and 2 are, 0.51 and 0.66 (phenolysis) and 0.55 and 0.70 (benzenethiolysis), respectively. These values suggest a concerted mechanism for these reactions, as found in the corresponding carbonates. Namely, substitution of OMe by SMe in the nonleavinggroup does not change
An S-aryl S-alkyl dithiocarbonate is prepared by pyroltically isomerizing an O-aryl S-alkyl dithiocarbonate at a temperature in the range 150.degree.-600.degree. C. The reaction product may be hydrolyzed to form an arenethiol or may be further reacted with an alcohol in the presence of a basic catalyst to form an aryl thioether.
Cyclohexyl radical is generated from cyclohexyldithiocarbonate and benzoyl peroxide. The radical source is used for the alkylation of heteroaromatic bases.
Backer, Recueil des Travaux Chimiques des Pays-Bas, 1952, vol. 71, p. 409,413
作者:Backer
DOI:——
日期:——
Backer, Recueil des Travaux Chimiques des Pays-Bas, 1951, vol. 71, p. 409,415