A Study of the Regioselectivity of the Radical Addition of "RSAr" Derived from the Photolysis of tert-Homoallyl and tert-Alkyl 4-Nitrobenzenesulfenates to Substituted Allenes and Alkenes
摘要:
The regioselectivity of the free radical addition of ''RSAr'' derived from the photolysis of tert-homoallyl and tert-alkyl 4-nitrobenzenesulfenates, followed by beta-scission of the alkoxy radicals to produce the allyl or alkyl radicals R. to 1,1- and 1,3-dimethylallene and acrylonitrile and methyl acrylate has been determined. The regioselectivity of addition of ''RSAr'' to 1,1- and 1,3-dimethylallene occurs by the addition of the arylthiyl radical to the-center carbon atom of the allene chromophore, whereas the regioselectivity of the addition to acrylonitrile and methyl acrylate varies with the nature of the R.. The results are interpreted in terms of the relative reactivities of the pi systems toward radical addition and the relative rates of beta-scission of the intermediate alkoxy radicals versus the rates of addition of the 4-nitrobenzenethiyl radical and R. to the pi systems.
Pasto Daniel J., Cottard Francois, J. Org. Chem, 59 (1994) N 16, S 4642-4646
作者:Pasto Daniel J., Cottard Francois
DOI:——
日期:——
A Study of the Regioselectivity of the Radical Addition of "RSAr" Derived from the Photolysis of tert-Homoallyl and tert-Alkyl 4-Nitrobenzenesulfenates to Substituted Allenes and Alkenes
作者:Daniel J. Pasto、Francois Cottard
DOI:10.1021/jo00095a045
日期:1994.8
The regioselectivity of the free radical addition of ''RSAr'' derived from the photolysis of tert-homoallyl and tert-alkyl 4-nitrobenzenesulfenates, followed by beta-scission of the alkoxy radicals to produce the allyl or alkyl radicals R. to 1,1- and 1,3-dimethylallene and acrylonitrile and methyl acrylate has been determined. The regioselectivity of addition of ''RSAr'' to 1,1- and 1,3-dimethylallene occurs by the addition of the arylthiyl radical to the-center carbon atom of the allene chromophore, whereas the regioselectivity of the addition to acrylonitrile and methyl acrylate varies with the nature of the R.. The results are interpreted in terms of the relative reactivities of the pi systems toward radical addition and the relative rates of beta-scission of the intermediate alkoxy radicals versus the rates of addition of the 4-nitrobenzenethiyl radical and R. to the pi systems.