4-methyl-6-(2,6,6-trimethyl-cyclohex-1-enyl)-hex-3-enoic acid (S)-methoxycarbonyl-phenyl-methyl ester                                                                                                                                                              在
                                                                                                                                                                                 
硫酸                                                                                                                                  作用下,
                                                                                                                以
                                                                                         
二氯甲烷                                                                                  为溶剂,
                                                                                                                                                    反应 0.5h,
                                                                                                                生成                                                 (S)-phenyl-[(1S,4aS,8aS)-2-(2,5,5,8a-tetramethyl-1,4,4a,5,6,7,8,8a-octahydro-naphthalen-1-yl)-acetoxy]-acetic acid methyl ester   、                                                                                             
(S)-phenyl-[(4aS,8aS)-2-(2,5,5,8a-tetramethyl-3,4,4a,5,6,7,8,8a-octahydro-naphthalen-1-yl)-acetoxy]-acetic acid methyl ester   、                                                                                             (S)-phenyl-[(1R,4aS,8aS)-2-(2,5,5,8a-tetramethyl-1,4,4a,5,6,7,8,8a-octahydro-naphthalen-1-yl)-acetoxy]-acetic acid methyl ester