Butylantimony(III) bromides react with Mg in tetrahydrofuran (THF) even in presence of Me 3 SiCl exclusively with Sb-Sb-coupling: Starting from Bu 2 SbBr, Bu 2 SbSbBu 2 is formed and BuSbBr 2 is reduced to (BuSb) x . Sb-Si-coupling dominates in the reactions of Ph 2 SbBr or t-Bu 2 SbCl with Mg/Me 3 SiCl/THF yielding Ph 2 SbSiMe 3 or t-Bu 2 SbSiMe 3 . Both Sb-Sb- and Sb-Si-coupling reactions are observed, when PhSbBr 2 reacts with Mg and Me 3 SiCl yielding PhSb(SiMe 3 ) 2 and (PhSb) x . The same reactants can also form the distibanes Ph 2 (SiMe 3 ) 2 Sb 2 and Ph(SiMe 3 ) 3 Sb 2 . The reaction of t-BuSbCl 2 with Mg/Me 3 SiCl yields the stibines t-BuSb(SiMe 3 ) 2 and Sb(SiMe 3 ) 3 together with (t-BuSb) 4 . In the reactions of t-BuSbCl 2 or PhSbBr 2 the ratio of Sb-Sb- and Sb-Si-coupling can be strongly influenced by using different reaction conditions.
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June 2, 2014
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June 2, 2014