3',6',7',8',9',9a'-Hexahydrospiro<1,3-dioxolan-2,5'-<3,9a>epoxy<5H>benzocyclohepten>-1',2'-dicarbonsaeure-dimethylester 以
乙醚 为溶剂,
反应 6.0h,
以34%的产率得到Spiro<1,3-dioxolan-2,8'-<2>oxapentacyclo<5.5.0.01,6.03,5.04,7>dodecan>-5',6'-dicarbonsaeure-dimethylester