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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...