Abstract
1. Thermal decomposition of bis-(9-o- and 9-m-carboranyl)mercury containing B-Hgσ bonds occurs with the formation of metallic mercury and a carboranyl radical. In the main the latter disproportionate giving carborane and oligocarborane and recombine to an insignificant extent into B,B'-biscarboranyl. 2. Thermal decomposition of 9-o and 9-m-carboranylmercury chlorides containing B-Hg σ-bonds occurs homolytically with the formation of metallic mercury and 9-chloro-o- and m-carboranes respectively. 3. A simple method has been proposed for making symmetrical the 9-o-, 9-m-, and 2-p-carboranylmercury chlorides (or trifluoroacetates) into the corresponding biscarboranylmercury derivatives under the action of an alkaline solution of sodium stannite.
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