Hypervalent Hydrosilicates Connected to Light Alkali Metal Amides: Synthesis, Structure, and Hydrosilylation Catalysis

Abstract

When light alkali metal amides [M(Me₃ TACD)]_n (M=Li, Na, K; (Me₃ TACD)H=1,4,7-trimethyl-1,4,7,10-tetraazacyclododecane) were treated with H₂ SiPh₂ in THF, [M{(H₂ SiPh₂ )Me₃ TACD}(thf)_x ] containing a pendant hypervalent dihydridosilicate were formed and characterized by elemental analysis, NMR/IR spectroscopy, and single-crystal X-ray crystallography. The lithium complex catalyzed the hydrosilylation of styrene derivatives under mild conditions with anti-Markovnikov regioselectivity.