报道了结晶紫内酯开环机理研究。通过测定开环前后及平衡混合物的￣（１３）ＣＮＭＲ谱，对结晶紫内酯开环形成的正碳离子结构及影响正碳离子稳定性因素进行了分析。利用开环前后及平衡体系的化学位移数据求得了平衡混合物中内酯态和正碳离子之间的平衡常数．对不同条件下结晶紫内酯开、闭环机制进行了讨论。 Reported the crystal violet lactone ring opening mechanism. By measuring the ~ (13) CNMR spectra of the open-loop and equilibrium mixtures, the structure of the orthocarbon ring formed by the ring opening of the crystal violet lactone and the factors affecting the stability of the positively charged carbon ion were analyzed. The equilibrium constants between the lactone and the carbanion in the equilibrium mixture were obtained by using the chemical shift data before and after the ring opening and the equilibrium system. The open-loop and closed-loop mechanism of crystal violet lactone under different conditions were discussed.