Extremely bulky secondary phosphinoamines as substituents for sterically hindered aminosilanes

Abstract

The synthesis of a series of extremely bulky secondary amines with a phosphine function, Ar^†(PR₂)NH (Ar^† = C₆H₂{C(H)Ph₂}₂Prⁱ-2,6,4; R = Ph, NEt₂, NPrⁱ₂) is described. Deprotonation with either n-BuLi or KH yields the respective alkali metal amides in some cases. Their reaction with the chlorosilanes SiCl₄, HSiCl₃, Cl₂SiPh₂, Cl₃Si–SiCl₃ and Si₅Cl₁₀ allows access to monomeric molecular compounds bearing the extremely bulky amino substituents via salt elimination. The products obtained may serve as precursors for subsequent reduction reactions to access sterically protected low valent and low coordinate silicon compounds.