反应 2.0h,
生成
(3aS,6aR,9aR,9bS)-2'-methyl-6,9-dimethylidenespiro[3a,4,5,6a,7,8,9a,9b-octahydroazuleno[4,5-b]furan-3,1'-cyclopropane]-2-one 、 (3aS,6aR,9aR,9bS)-6,9-Dimethylene-3-prop-(E)-ylidene-decahydro-azuleno[4,5-b]furan-2-one 、 (3aS,6aR,9aR,9bS)-6,9-Dimethylene-3-prop-(Z)-ylidene-decahydro-azuleno[4,5-b]furan-2-one