(1α,6α)-8,8-dimethyl-7α-<(tert-butyldimethylsilyl)oxy>-2α-carbethoxy-2β-vinyl-4-methylenetricyclo<4.3.0.01,3>nonane 生成
(5β,8α)-2α,2β-dimethyl-9-carbethoxy-6-methylenetricyclo<6.3.0.04,8>undec-9-ene 、
(E)-2-(5,5-Dimethyl-2-methylene-2,3,3a,4,5,6-hexahydro-pentalen-1-yl)-but-2-enoic acid ethyl ester