Icosahedral carboranes. XI. Germanium and tin derivatives of o-, m-, and p-carborane and their polymers

Article abstract of DOI:10.1021/ic50081a039

The dilithio salts of o-, m-, and p-carborane were allowed to react with selected chloro derivatives of germanium and tin. In the germanium series, disubstituted o-carborane derivatives were formed as in the similar silicon chemistry, but the germanium m- and p-carborane products obtained were mixtures of disubstituted monomers and related polymers. In analogous reactions of the m- and p-dilithio salts with various substituted dichlorotin derivatives, it was found that the tendency toward polymerization is much more pronounced although the substituents still have a marked influence on the type of product formed. With regard to preparing high-melting linear polymers, homopolymers based on p-carborane nuclei linked by tin with softening points up to 420° could be obtained; in addition, related random copolymers having melting ranges between 350 and 400° were prepared.