Synthesis and characterization of alkynyl complexes of groups 1 and 2

Abstract

The synthesis of N-heterocyclic carbene adducts of alkynyl lithium and magnesium is achieved, and different degrees of association are observed. Reaction of strontium amide nacnacSrN(SiMe3)2(thf) (nacnac = CH(CMe2,6(Pr2C6H3N)2) with PhC = CH in THF yields the dimeric alkynyl complex [nacnacSr(thf)(μ-C=CPh)] 2 which shows an interesting coordination geometry around the metal center. The compound retains the THF molecules, unlike its lighter congener, even in hydrocarbon solvents. © 2009 Wiley-VCH Verlag GmbH & Co. KGaA.