2-formyl-3-(4-methylbenzyl)-5,5,8,8-tetramethyl-5,6,7,8-tetrahydronaphthalene 、 ethyl 4-{(E)-2-[5,5,8,8-tetramethyl-3-(2,4-difluorobenzyl)-5,6,7,8-tetrahydro-naphthalen-2-yl]vinyl}benzoate 以72%的产率得到4-{(E)-2-[5,5,8,8-tetramethyl-3-(2,4-difluorobenzyl)-5,6,7,8-tetrahydro-naphthalen-2-yl]vinyl}benzoic acid