Abstract
Radical cyclization of 1-vinyl-5-methyl-5-hexenyl radicals (radical numbering) affords six-membered ring products prevailing over the isomeric five-membered ring compounds; the former are generated through two reaction pathways: 6- endo– trig ring closure and rearrangement of intermediate methylenecyclopentyl radicals obtained by 5- exo– trig cyclization.
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