T. Seifert et al., MONOMERIC N-LITHIOARYLSTANNYLAMINES AND N-LITHIOBORYLSTANNYLAMINES FROM DISTANNYLAMINES, EUROPEAN JOURNAL OF INORGANIC CHEMISTRY, (9), 1998, pp. 1343-1349
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.