Grignard reagent–acid chloride condensation in the presence of copper(<scp>I</scp>) chloride. A study of structural effects by direct and competition methods
作者:John Anthony MacPhee、Michel Boussu、Jacques-Emile Dubois
DOI:10.1039/p29740001525
日期:——
The copper(I) chloride catalysed reaction between a Grignard reagent and an acid chloride in ether has been studied by using a competition method in which a pair of acid chlorides reacts with a single Grignard reagent, and by direct kinetic experiments in one case. The variation of relative rates produced by structural changes in the alkyl group of the acid chloride has been shown to correlate with
已经通过使用竞争方法研究了格氏试剂与醚中的酰氯之间的氯化铜(I)催化反应,在竞争方法中,一对酰氯与单一格氏试剂反应,并且在一种情况下通过直接动力学实验。酰基氯的烷基结构变化所产生的相对速率的变化已表明与塔夫脱极性参数σ*相关,但与空间参数E S无关(对于EtMgBr,ρ* = 2·96; 6 ·01卜吨CH 2 MGCI; 12·7卜吨氯化镁); 这与这种对空间效应具有显着敏感性的未催化反应相反。这些结果与环状过渡态一致,在该环状过渡态中,氯化铜从酰氯中被取代而不添加羰基,这是通过混合的铜酸盐(I)中间体[RCuX] – MgX +或疏松的RCu⋯MgX 2络合物实现的。