酸性离子液体[BPy]HSO_4和[BMMIm]HSO_4催化合成查尔酮反应机理探讨

Discussion on Synthesis and Reaction Mechanism of Chalcone Catalyzed by Acidic Ionic Liquids[BPy]HSO_4 and[BMMIm]HSO_4

离子液体作为绿色的溶剂和催化剂具有很多独特的性质,特别是离子液体的可设计性,使其具有酸性可调的特点.分别以酸性离子液体[BPy]HSO4和[BMMIm]HSO4为催化剂,在无溶剂条件下考察了两种离子液体对Claisen-Schmidt缩合的不同催化效果,探讨了两种离子液体在查尔酮合成中可能的催化机理.

Ionic liquids(ILs)as green solvents and catalysts have unique properties such as a broad liquid range,good solvating ability,high thermal stability,and negligible vapor pressure,especially designability of ILs,which makes the acidity of ILs can be adjustable.[BPy]HSO4 and[BMMIm]HSO4 acidic ILs catalyzing Claisen-Schmidt(CS) condensation of acetophenone with benzaldehyde were investigated under solvent-free conditions.The plausible mechanism was elucidated for the synthesis of chalcone using the two ILs as Brnsted acid catalysts.