[1-(1,1,2,3,3-Pentamethyl-5-indanyl)ethyl]-triphenylphosphonium bromide 、
4-甲酰基苯甲酸乙酯 以can be obtained p-[(E)-2-(1,1,2,3,3,-pentamethyl-5-indanyl)propenyl]-benzoic acid ethyl ester of melting point 79°-80° C.的产率得到2-(1,1,2,3,3-pentamethyl-indanyl-5)-1-(E)-(4-carbethoxy-phenyl)-propene