A General Approach to Mechanism in Multiproduct Reactions: Product-Specific Intermolecular Kinetic Isotope Effects
作者:Shuhuai Xiang、Matthew P. Meyer
DOI:10.1021/ja412827c
日期:2014.4.23
Here we report a general method for the measurement of (13)C kineticisotopeeffects at naturalabundance for reactions that yield two or more products concurrently. We use, as an example, a recently reported Co-catalyzed reaction between cyclopentene and 1-phenyl-1-propyne. High-precision intermolecular (13)C isotopeeffects are reported for both the formal [2+2] cycloaddition (major) and Alder-ene
在这里,我们报告了一种在自然丰度下测量 (13) C 动力学同位素效应的通用方法,用于同时产生两种或多种产物的反应。我们以最近报道的环戊烯和 1-苯基-1-丙炔之间的共催化反应为例。报告了正式的 [2+2] 环加成(主要)和阿尔德烯(次要)反应产物的高精度分子间 (13)C 同位素效应。讨论了与观察到的同位素效应测量一致的机械可能性。
Cobalt Catalysis at the Crossroads: Cobalt-Catalyzed Alder−Ene Reaction versus [2 + 2] Cycloaddition
作者:Gerhard Hilt、Anna Paul、Jonas Treutwein
DOI:10.1021/ol100266u
日期:2010.4.2
The application of bidentate phosphine ligands in cobalt-catalyzed transformations of cyclic alkenes such as cyclopentene and cycloheptene with internal alkynes led to a chemoselective Alder−ene or a [2 + 2] cycloaddition reaction depending on the electronic nature of the alkyne and the bite angle of the ligand used.