Alkylderivatives of Stanna- closo-dodecaborate

Abstract

The reactions of [SnB 11H 11] 2− with organic halides like 1-chloro-3-iodopropane, allylbromide, propargylbromide and 2,6-bis-(bromomethyl)pyridine lead in a nucleophilic substitution at room temperature to the products [Bu 3MeN][Cl(CH 2) 3SnB 11H 11] ( 4), [Bu 3MeN][H 2CCHCH 2SnB 11H 11] ( 6), [Bu 4N][HCCCH 2SnB 11H 11] ( 7), and [Bu 4N] 2[2,6-(H 11B 11SnCH 2) 2(C 5H 3N)] ( 8). In water Na 2[SnB 11H 11] reacts with 2-bromoethylamine hydrobromide at 50 °C and 3-bromopropylamine hydrobromide at 70 °C to the zwitterionic products [H 11B 11Sn(CH 2) n NH 3] ( n=2, 3), which were characterized by X-ray crystal structure analysis. [H 11B 11Sn(CH 2) 2NH 3] crystallizes with one equivalent of water under the formation of NHO hydrogen bonding. In the case of chloroiodomethane and diiodomethane the substitution reaction proceeds differently and the monosubstituted components were not detected. The disubstituted compound [Bu 3MeN] 2[H 2C(SnB 11H 11) 2] ( 5), whose structure could be confirmed by X-ray crystal structure analysis, is the only observed reaction product.