(+/-)-7-benzhydryl-8-phenyl-(4at)-1,2,3,4,4a,5-hexahydro-1r,4c-etheno-naphthalene-2t,3t,5c,6-tetracarboxylic acid tetramethyl ester 在
sodium methylate 作用下,
生成 (+/-)-7-benzhydryl-8-phenyl-(4a
t)-1,2,3,4,4a,5-hexahydro-1
r,4
c-ethano-naphthalene-2
c,3
t,5
t,6-tetracarboxylic acid tetramethyl ester