SEARCH Articles Figures Tables 2- -2-alken-4-olide 2-alkenoate ester 2-alkenoate ester alkene 2-alkenoic acid 2-alkenal 2-cyano-4-alkenoate ester alkene 2-hydroxy-4-alkenoate ester alkene 2-sulfinyl-4-alkenoate ester alkene 2-sulfonyl-4-alkenoate ester alkene 3- -5-alkenoic acid 2-alken 3-alkenoate ester 2-alken-l-one 3-alkenoate ester 3-alkoxy-1-alkene 3-alkenoic acid 3-alken-3-olide 3-alkenoic acid alkene 4-alkenoate aryl ester 1 -lithio-1 -alkene 5-alkene-5-lactam 2-alkenoate ester 5-alkenoate ester 3-nitro-1-alkene