Lithium η3-aza-allyl) type complexes derived from the metallation of 2-(Me3Si)3 –nCHnC5H4N; influence of solvent and degree of substitution, n= 1 or 2, on the nature of the product

Abstract

Metallation of 2-Me₃Si)₂CHC₅N (RH) with LiBuⁿ in hexane yields RLi·RH, (1), whreas RH with LiBuⁿ and tmeda (tetramethylethylenediamine; 1 equiv.) in hexane affords Rli(tmeda), (2); the related 2-(Me₃Si)CH₂C₅H₄N (R′H) with LiBuⁿ in a hexane–diethyl ether mixture gives [{LiR′(OEt₂)}₂], (3): compounds (1)–(3), shown by X-ray crystallography to have novel η³-aza-allyl ligand geometries, are regarded as models for the bonding in the products of metallation of systems CH₃-C(R″)NR‴.