Activation and Functionalization of C–C σ-Bonds of Alkylidene Cyclopropanes at Main Group Centers
Created: 2020-06-20 11:32
Last modified: 2020-06-29 08:31
License: Creative Commons: Public Domain Dedication 1.0
Funding: (none given)
Aluminum(I) and magnesium(I) compounds are reported for the C–C sigma-bond activation of strained alkylidene cyclopro-panes. These reactions result in the formal addition of the C–C sigma-bond to main group center either at a single site (Al) or across a metal–metal bond (Mg–Mg). Mechanistic studies suggest that rather than occurring by a concerted oxidative addition, these reactions involve stepwise processes in which substrate binding to the main group metal acts as a precursor to alpha- or beta-alkyl migration steps that break the C–C sigma-bond. This mechanistic understanding is used to develop the magnesium-catalyzed hydrosilylation of the C–C sigma-bonds of alkylidene cyclopropanes.