Synthese von Mesitylstibanen / Synthesis of Mesitylstibanes

Abstract

Trimesitylstibane (1) reacts with SbCl3 or SbBr3 to form the halostibanes Mes2SbCl (2), MesSbCl3 (3), Mes2SbBr (4). or MesSbBr2 (5) [Mes = 2,4,6-(CH3)3C6H2]. Action of MesMgCl on an excess of SbCl3 or SbBr3 at low temperatures gives Mes3SbCl2 (6) or Mes3SbBr2 (7), resp. Addi­tion of Br2 to 1 gives 7 in 96% yield. The silylstibanes Mes2SbSiMe3 (8) and McsSb(SiMc3)2 (9) are formed by dehalogenation of Me3SiCl and 4 or 5 by Mg filings in tetrahydrofuran. Mes2SbOSiMe3 (10) is obtained by air oxidation of 8. Reduction of 4 with Mg gives Mes2SbSbMes2 (19). Crystals of the composition (MesSb)6·C6H6 (13a) or (MesSb)4·C6H5CH3 (13b) are obtained from Mg and 5 after work-up in benzene or toluene, resp.