Nucleophilic substitution in benzylic phosphonothioic dichlorides formation of a diamide without intervention of the amidic chloride
作者:Martin J.P. Harger
DOI:10.1016/0040-4039(96)01880-1
日期:1996.11
The diamide RP(S)(NEt2)2 (R = PhCH2 or Ph2CH) is formed directly from the dichloride RP(S)Cl2 more quickly than it is from the amidic chloride RP(S)(NEt2)Cl
Evidence for a methylenethioxophosphorane (thiophosphene) intermediate in nucleophilic substitution at a benzylthiophosphonyl centre
作者:Michael P. Coogan、Martin J. P. Harger
DOI:10.1039/c39900001745
日期:——
The remarkably high rate of the reaction of p-NO2C6H4CH2P(S)(NMe2)Cl with Et2NH, the presence of deuterium in the benzylic methylene group of the product formed with Et2ND, and the relative lack of discrimination between competing Me2NH and Et2NH, suggest an elimination–addition mechanism for substitution, with a three-coordinate PV methylenethioxophosphorane (thiophosphene) intermediate 6.