6-Methyl-6-hepten-2-one 3 was obtained by the alkylation of acetoacetic ester with 1bromo-3-methyl-3-butene followed by saponifi-cation and decarboxylation of the alkylate.

• 乙酰乙酸乙酯与1-溴-3-甲基-3-丁烯进行烷基化、皂化脱羧反应得6-甲基-6-庚烯-2-酮3。