Magnesium-mediated reductive defluorinative cross-electrophile coupling of α-trifluoromethyl styrenes with chlorosilane enabling the synthesis of gem-difluoroallylhydrosilanes.

gem-Difluoroallylsilanes are synthetically valuable building blocks due to their potential as difluoroallylation and silylation reagents. Existing approaches often suffer from limitations such as poor functional group compatibility, the reliance on pre-prepared silyl precursors, and limited availability of silyl precursors. Furthermore, these approaches are not suitable for the preparation of gem-difluoroallylhydrosilanes. Herein, we report a Mg0-mediated defluorinative silylation of α-trifluoromethyl alkenes enabling the synthesis of gem-difluoroallylhydrosilanes employing chlorosilanes as the silyl source.