1-Methyl-3-(2,6,6-trimethyl-1-cyclohexen-1-yl)allyl-triphenylphosphonium chloride 、 Ethyl 5-formyl-4-methyl-2,4-pentadienoate 以
甲醇 为溶剂,
以there is obtained ethyl 4,7-dimethyl-9-(2,6,6-trimethyl-1-cyclohexen-1-yl)-2,4,6,8-nonatetraenoate of melting point 65°-66° C. (from methanol)的产率得到Ethyl 4,7-dimethyl-9-(2,6,6-trimethyl-1-cyclohexen-1-yl)-2,4,6,8-nonatetraenoate