The kinetic impact of vinylic fluorine substituents on 5-hexenyl radical cyclizations
作者:William R. Dolbier、Xiao X. Rong
DOI:10.1016/0040-4039(96)01120-3
日期:1996.7
A study of the effect of vinylic fluorine substituents on the 5-hexenyl radical cyclization indicates that substituents at the 6-position, or vicinal 5,6-difluoro substitution have little effect on the rate, whereas a 5-fluoro substituent slows down the rate by a factor of 10.8, and 5,6,6-trifluoro substitution enhances the rate by a factor of 2.3. The results are explained in terms of a combination