Syntheses and structural studies of [2-(6-methyl)pyridyl]- and (8-quinolyl)trimethylsilylamido-lithium complexes

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Abstract
Reactions of 6-methyl-2-trimethylsilyaminopyridine (Hmtmsap) with LiBun in hexane–diethyl ether, [LiBun(tmen)](tmen =N,N,N′,N′-tetramethylethylenediamine), or LiBun in hexane, yield, respectively, [{Li(OEt2)(mtmsap)}2](1), [Li(tmen)(mtmsap)](2), and [{Li(mtmsap)}2](3). Mixtures (5:2) of Hmtmsap and 2-amino-6-methylpyridine (Hamp) yield the complex molecule [Li7(mtmsap)5(amp)2](4). Corresponding compounds, prepared via metallation of 8-trimethylsilyl-aminoquinoline (Htmsaq), are [{Li(OEt2)(tmsaq)}2](5), [Li(tmen)(tmsaq)](6), and [{Li(tmsaq)}2](7). Compounds (1), (2), and (4)–(7) are crystalline and have been characterized by X-ray structure determination. Compounds (1) and (5) are dimeric with four-co-ordinate lithium centres, the amido-N bridging; (7) is based on the structure of (5), but with a gap in the metal co-ordination spheres where the ether ligands reside in (5). Compounds (2) and (6) are monomeric with four-co-ordinate metal centres, and (4) has seven different metal environments, each either three- or four-co-ordinate and with both bridging amido-N and pyridine-N centres.

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