Acrylic acid (1S,2R,4R)-7,7-dimethyl-1-(naphthalene-1-sulfonylmethyl)-bicyclo[2.2.1]hept-2-yl ester   、                                                                                      
环戊二烯                                                                                                                                                              在
                                                                                                                                                                                 
二异丙氧基二氯化钛                                                                                                                                  作用下,
                                                                                                                                                                                                                            生成                                                 (1R,2S,4R)-Bicyclo[2.2.1]hept-5-ene-2-carboxylic acid (1S,2R,4R)-7,7-dimethyl-1-(naphthalene-1-sulfonylmethyl)-bicyclo[2.2.1]hept-2-yl ester   、                                                                                             (1R,2S,4R)-Bicyclo[2.2.1]hept-5-ene-2-carboxylic acid (1S,2R,4R)-7,7-dimethyl-1-(naphthalene-1-sulfonylmethyl)-bicyclo[2.2.1]hept-2-yl ester   、                                                                                             
(1R,2S,4R)-Bicyclo[2.2.1]hept-5-ene-2-carboxylic acid (1S,2R,4R)-7,7-dimethyl-1-(naphthalene-1-sulfonylmethyl)-bicyclo[2.2.1]hept-2-yl ester   、                                                                                             (1R,2S,4R)-Bicyclo[2.2.1]hept-5-ene-2-carboxylic acid (1S,2R,4R)-7,7-dimethyl-1-(naphthalene-1-sulfonylmethyl)-bicyclo[2.2.1]hept-2-yl ester