这项工作表明了一种新的策略,即将非氧化还原金属离子作为路易斯酸引入经典的双核锰配合物[Mn IV 2(μ-O)3(Me 3 tacn)2 ](PF 6)2可以极大地促进该过程。 H 2 O 2作为唯一末端氧化剂,在温和条件下的烯烃环氧化效率,因为其经济和环境优势。当[Mn IV 2(μ-O)3(Me 3 tacn)2 ](PF 6)2在没有路易斯酸的情况下,将其用作催化剂,仅获得16.4%的环辛烯转化率和6.2%的环氧化物收率,并且观察到H 2 O 2明显分解。但是,当将非氧化还原金属离子(例如Sc 3+)引入到催化体系中时,在相同的条件下,转化率达到100%,环氧化物的收率达到90.2%,催化剂的氧转移效率急剧提高。该新策略已成功应用于不同类型烯烃的环氧化反应。通过UV-vis,FT-IR,EPR和CV表征,证明具有高正电荷的非氧化还原金属离子(路易斯酸)可以分解缓慢的双核Mn-(μ-O
Process is disclosed for the selective epoxidation of bicyclic olefins. Such olefins are contacted with an oxygen-containing gas in the presence of a silver catalyst under defined reaction conditions, thereby selectively producing epoxides in good yield.
Provided is a method for producing an episulfide compound, the method including a step of thiating epoxy groups of (B) an epoxy compound by a reaction with (C) a thiating agent in the presence of (A) a polyhydric hydroxyl compound having two or more hydroxyl groups.