SEARCH Articles Figures Tables 3- -5-hexenoates 4-Hexenoic acid, 2-acetyl-2-methyl-6-bromoethyl ester 4-Hexenoic acid, 2-acetyl-2-methyl-6-bromoethyl ester cyclization 5-Hexenoic acid, 2-amino-4-methylsynthesis via ene reaction of acrylate esters