M. Veith et al., A LI2BR2 RING TRAPPED BY TERT-BUTYLAMINOTIN(II) BROMIDE AND TERT-BUTYLAMINE AS FOUND BY X-RAY CRYSTALLOGRAPHY, Journal of the Chemical Society, Chemical Communications, (2), 1995, pp. 213-214
Reaction of the cyclic compound [Bu(t)(H)]N-Si(Me)2-N(Bu(t))-SnBr with
tert-butylamine intermediate yields the [Bu(t)(H)N-SnBr](2), which wi
th excess tert-butylamine, ligates a four-membered Li2Br2 ring [2.61(2
) and 2.69(2) Angstrom] by multiple acid-base interactions between the
metallic and the non-metallic centres giving a molecular product of t
he composition {Sn-2[N(H)Bu(t)]Br-2(2)}(2).Li2Br2.4Bu(t)NH(2) as shown
by X-ray crystallography.