Synthesis and Characterization of Alkynyl Complexes of Groups 1 and 2

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‐iPr₂C₆H₃N)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.