The cause of the rate acceleration by diethyl ether solutions of lithium perchlorate (LPDE) in organic reactions. Application to high pressure synthesis
作者:Gérard Jenner、Ridha Ben Salem
DOI:10.1016/s0040-4020(97)00172-5
日期:1997.3
Kinetic studies of isoprene cyclodimerization show that the accelerating effect caused by LPDE (solution of lithium perchlorate in diethyl ether) in some organic reactions cannot be ascribed to internal pressure of LPDE. The kinetic effect is essentially due to catalysis through Li+. Additional arguments are provided by comparison of yields obtained in LPDE (0,1 MPa) and in organic solvents (under
异戊二烯环二聚反应的动力学研究表明,在某些有机反应中,LPDE(高氯酸锂在乙醚中的溶液)引起的加速作用不能归因于LPDE的内压。动力学效应主要归因于通过Li +的催化作用。通过比较在LPDE(0.1 MPa)和有机溶剂(在压力下)对于各种电子类型的Diels-Alder反应获得的产率,提供了其他论据。高压和LPDE催化的结合被揭示为出色的多重活化过程,可实现困难的合成,但仅适用于[4 + 2]环加成反应。