methyl 8,9-epoxynon-5-ynoate

methyl 9-bromo-8-hydroxy-non-5(Z)-enoate

methyl (Z)-9-bromo-8-oxonon-5-enoate

methyl (Z)-8,9-epoxynon-5-enoate

(Z)-(9-methoxy-2,9-dioxonon-4-en-1-yl)triphenylphosphonium