Photolysis of the epoxide (3) or (5)gave the strained lactone (4) in 40–50% yield; the bicyclic lactone (4)gave the functionalised cyclobutane (6) on treatment with acidic methanol, the structure of which was confirmed by X-ray analysis.
环氧化合物(3)或(5)的光解作用使应变的内酯(4)的收率达到40-50%;双环内酯(4)在用酸性
甲醇处理后得到官能化的
环丁烷(6),其结构通过X射线分析证实。