Synthesis and structure of diorganotin dibromides, R2SnBr 2 (R = 2,4,6-trimethylphenyl or 2,4,6-trimethylbenzyl): Hydrolysis of (2,4,6-Me3C6H2)2SnBr2

Abstract

The reaction of SnBr4 with in situ generated 2,4,6-trimethylphenylmagnesium bromide afforded a mixture of (2,4,6-Me 3C6H2)2SnBr2 (1) and (2,4,6-Me3C6H2)3SnBr (2) which could be separated from each other by their solubility differences in diethyl ether. On the other hand, the reaction of tin metal with 2,4,6-Me3C 6H2CH2Br afforded (2,4,6-Me3C 6H2CH2)2SnBr2 (3). Hydrolysis of the latter using triethylamine as the base afforded [{(2,4,6-Me3C6H2CH2) 2Sn}2(μ-O)(Br)(μ-OH)]2·2CH 2Cl2 (4) while the use of NaOH as the base afforded [{(2,4,6-Me3C6H2CH2) 2Sn}2(μ-O)(OH)(μ-OH)]2·2CH 2Cl2 (5). Compounds 4 and 5 are dimeric tetraorganodistannoxanes consisting of a central distannoxane (Sn 2O2) motif. © Indian Academy of Sciences.