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
研究了冠醚(6和7)对2-乙氧基羰基环己酮(1)的钠(2a)和烯醇钾(2b)与异丙基碘在二甲亚砜和二甲氧基乙烷中反应的影响。当冠状醚的添加促进了离子对2在两种溶剂中的任何一种中的解离时,总反应速率(k t)增大,并且碳(3)与氧烷基化的比率(4和5)产品减少。结果与离子对和更多解离的物种都参与烷基化以及对后者的更高反应性相一致。