近年来,以碳阳离子、碳阴离子、自由基以及卡宾(Carbene)为活性中间体的有机反应发展很快,1982年mom止MEHⅡ等人发表了用酰氟硼酸盐为酰化剂经三元环合成了一系列的高级环。PyⅡcnxo等人研究了苄基阳离子的新反应,厂.B.noucxb等人进行了1.5—二酮类分子内环化反应的探讨,以上反应过去未曾报导,现简要叙述如下: In recent years, the organic reaction with carbocations, carbanions, free radicals and Carbene as the active intermediate has developed rapidly. In 1982, MEH II et al. Published a report on the use of acylfluoroborate as acylating agent by ternary Ring synthesis of a series of high-level ring. PyⅡcnxo et al. Studied a new reaction of benzyl cation, M.B.noucxb et al. Conducted a discussion of the intramolecular cyclization of 1.5-diketones. The above reaction was not reported in the past and is briefly described as follows: