Absoluterateconstants were determined for the additions of 5 5-X-substituted ArCCl (X=CF3, Cl, H, CH3, CH3O) to tetramethylethylene, trimethylethylene, trans-pentene, and 1-hexene; good Hammett correlations were obtained with ϱ = +1.4 – 1.6.
Concurrent Cyclopropanation by Carbenes and Carbanions
作者:Robert A. Moss、Jingzhi Tian
DOI:10.1021/ja052426p
日期:2005.6.1
The generation of phenylhalocarbenes in the presence of varying quantities of halide ions and electron-poor alkenes affords concurrent cyclopropanation of the alkenes by an equilibrating mixture of phenylhalocarbenes and phenylhalomethide carbanions, which permits the smooth modulation of selectivity between electron-poor alkenes and electron-richalkenes, a feature of potential synthetic utility.