Synthese gemischtsubstituierter Triorganobismutane / Synthesis of Mixed Substituted Triorganobismuthanes

Abstract

Sodium dimethylbismuthide, generated from dimethylbismuth bromide and sodium in liquid ammonia, was treated with alkyl halides to produce dimethylalkylbismuthanes, Me 2 Bi(alk) (alk = C 2 H 5 , n-C 3 H 7 , n-C 4 H 9 , C 3 H 5 , i-C 3 H 7 ) as thermolabile liquids in yields ranging from 70 to 90%. With methylene chloride bis(dimethylbismutho)methane, (Me 2 Bi) 2 CH 2 , was obtained. Aryldimethylbismuthanes, (aryl)BiMe 2 , were prepared by treating dimethylbismuth bromide in THF with elemental lithium (-78 °C) and subsequent reaction with aryl halides (aryl = 4-C 6 H 4 CH 3 , 4-C 6 H 4 OCH 3 , 2,4,6-C 6 H 2 (CH 3 ) 3 ). At 90 °C in an N 2 -stream, the thermolabile compounds react quantitatively to form diarylmethylbismuthanes, (aryl) 2 BiMe and Me 3 Bi.