Compounds containing λ3,σ2-SbC bonds: synthesis and structural characterisation of the first stiba-enol, Mes*C(O)SbC(OH)Mes* (Mes* = C6H2But3-2,4,6) and a 2,3-distibabutadiene, {Mes(Me3SiO)CSb}2 (Mes = C6H2Me3-2,4,6)†

Abstract

The reactions of [Li{Sb(SiMe₃)₂}] with RCOCl, R = C₆H₂Bu^t₃-2,4,6 (Mes*) or C₆H₂Me₃-2,4,6 (Mes), afford mixtures of the 2,3-distibabutadienes, {R(Me₃SiO)CSb}₂, and the 2-stiba-1,3-dionatolithium complexes, [Li{OC(R)SbC(R)O}(DME)_n], n = 1 or 0.5, the latter of which (R = Mes*) can be protonated to give the first stiba-enol, Mes*C(O)SbC(OH)Mes*, which has been structurally characterised.