methyl (2E,6Z)-9-[(1S,4aS,8aS)-5,5,8a-trimethyl-2-methylidene-3,4,4a,6,7,8-hexahydro-1H-naphthalen-1-yl]-3,7-dimethylnona-2,6-dienoate                                                                                                                                                              在
                                                                                                                                                                                 
氟磺酸                                                                                                                                  作用下,
                                                                                                                以
                                                                                         
乙醚                                                                                  为溶剂,
                                                                                                                                                    反应 5.83h,
                                                                                                                生成                                                 (E)-3-Methyl-5-((1S,2S,4bS,8aS)-1,2,4b,8,8-pentamethyl-1,2,3,4,4b,5,6,7,8,8a,9,10-dodecahydro-phenanthren-1-yl)-pent-2-enoic acid methyl ester