MONOMERIC N-LITHIOARYLSTANNYLAMINES AND N-LITHIOBORYLSTANNYLAMINES FROM DISTANNYLAMINES

8-Aminoquinoline reacts with (dimethylamino)trimethylstannane in a 2:1 molar ratio, undergoing transamination to the distannylamine la. The trimethylstannyl)amino]-9-borabicyclo[3.3.1]nonane (Ib) is obtained by the stannazane cleavage reaction of tris (trimethylstannyl)amine with 9-chloro-9-BBN. The cleavage of one Sn-N bond of the distannylamines 1a and 1b with MeLi yields the first two monomeric N-lithioaminostanna nes, 2a and 2b, which can be stored at ambient temperature without dec omposition. The molecular structures of la, Ib, 2a, and 2b have been d etermined by multinuclear magnetic resonance spectra in solution, as w ell as by X-ray structure analysis. Characteristic features are the in tramolecular adduct formation of the quinoline ring nitrogen atom with one of the stannyl groups in la, as well as with the lithium cation i n 2a, and the surprisingly short bonds between the central nitrogen at om and the adjacent elements [d((NSn)): 2.02 Angstrom, d((NB)): 1.38 A ngstrom, d((NC)): 1.34 Angstrom, d((NLi)): 1.95 Angstrom] detected in the molecular structures of the lithium salts.