(1β,2α,6α,8β)-11β-acetoxy-11α-(1,3-dithian-2-yl)-4,4-dimethyl-3,5-dioxatricyclo<6.3.0.0
2,6>undec-9-ene   、                                                                                      
(1β,2α,6α,8β)-11α-acetoxy-11β-(1,3-dithian-2-yl)-4,4-dimethyl-3,5-dioxatricyclo<6.3.0.02,6>undec-9-ene   、                                                                                      
二氧化铅                                                                                                                                                                                                                                                                                                          生成                                                 [(3aS,3bS,6aS,7aR)-4-formyl-2,2-dimethyl-3a,3b,4,6a,7,7a-hexahydropentaleno[1,2-d][1,3]dioxol-6-yl] acetate