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A reaction of the protonated form of 7,8-dicarba-nido-undecaborate anion 7,8-C2B9H13 with thiourea leads to the formation of a mixture of 9- and 10-thiuronium derivatives, the alkaline hydrolysis of which gives a mixture of the corresponding mercapto derivatives of nido-carborane. The alkylation of the latter with benzyl bromide led to a mixture of dibenzylsulfonium derivatives 9-Bn2S-7,8-C2B9H11...
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