3',6',7',8',9',9a'-Hexahydrospiro<1,3-dioxolan-2,5'-<3,9a>epoxy<5H>benzocyclohepten>-1',2'-dicarbonsaeure-dimethylester 以
乙醚 、
甲苯 为溶剂,
反应 8.0h,
生成 1',6',7',8',9',9a'-Hexahydrospiro<1,3-dioxolan-2,5'-<1,9a>epoxy<5H>benzocyclohepten>-3',4'-dicarbonsaeure-dimethylester