Upon irradiation with 300-nm UV light, the photolysis of diazomalonates in benzene unexpectedly affords 2,6-dicarboxylate bicyclo[3.2.0]hepta-2,6-dienes in low yields. These products are proven to be derived from cyclohepta-1,3,5-triene intermediates presumably via a tandem 1,5-carboxylate migration/[2+2] cycloaddition sequence.
在用300 nm紫外线照射后,重氮
丙二酸酯在苯中的光解出乎意料地以低收率提供了2,6-二
羧酸双环[3.2.0]庚2,6-二烯。这些产物被证明是从环庚-1,3,5-
三烯中间体衍生而来的,大概是通过串联的1,5-
羧酸盐迁移/ [2 + 2]环加成序列进行的。