The photoaddition, hydrolysis, retro-aldol sequences 1 2 3 and 4 5 + 6 7 proceeded in high yield and in a regiospecific manner. However, the enol acetate 8 on irradiation furnished the tricyclic ketoacetate 9 as the major product, presumably by a hydrogen shift in the intermediate diradical 11. Hydrolysis of the minor photoadduct 10 gave the dione 13.
光加成,
水解,逆醛醇序列1 2 3和4 5 + 6 7以高产率和区域特异性方式进行。但是,辐射时的烯醇
乙酸酯8提供了
三环酮
乙酸酯9作为主要产物,大概是由于中间双自由基11中的氢转移。次要光加合物10的
水解得到二酮13。