The effect of crown ethers on the alkylation of a cyclic β-keto ester
作者:Richard R. Whitney、David A. Jaeger
DOI:10.1016/s0040-4020(01)93692-0
日期:1980.1
The effects of crown ethers (6 and 7) on the reactions of sodium (2a) and potassium enolates (2b) of 2-ethoxycarbonylcyclohexanone (1) with isopropyl iodide in dimethylsulfoxide and dimethoxyethane have been investigated. When the addition of crown ether promoted dissociation of ion pair 2 in either of the two solvents, the total rate of reaction (kt) increased and the ratio of carbon- (3) to oxygen-alkylation