Synthesis and characterisation of the first stable, heteroleptic silylstannylenes†

Abstract

Treatment of the silylene Si[C₆H₄(NCH₂Bu^t)₂-1,2] with SnAr₂ or SnAr[N(SiMe₃)₂] yields the thermally stable (silyl)stannylene SnAr[Si{C₆H₄(NCH₂Bu^t)₂-1,2}X] [X = Ar 1 or N(SiMe₃)₂ 2], having δ [¹¹⁹Sn{¹H}] 412 [¹J(²⁹Si–^117/119Sn) 715/749 Hz] (1) and δ 621 (2); crystalline 1 has a V-shaped Si–Sn–C skeleton, l(Sn–Si) = 2.636(2) Å and two remote Sn···N contacts, av. 2.75 Å (to one NMe₂ group of each of the aryl groups).