Abstract
1. The alkylation of 1-isopropyl-o-carborane by 4-chlorobutyric acid under the action of AlCl3 produces 4-(1-isopropyl-o-carboran-9-yl)butyric acid. 2. o-Carborane, 1-isopropyl-o-carborane, and m-carborane are alkylated by 5-chlorovaleric acid under the action of AlCl3 with isomerization of the alkyl chain and the formation of the corresponding 4-(o-and m-carbon-9′-yl)valeric acids. 3. The alkylation of o-carborane by an excess of 5-chlorovaleric acid in the presence of AlCl3 results in the introduction of two acid residues into the nucleus with the formation of 9,12-bis(3′-carboxybutyl)-o-carborane. 4. The alkylation of o-carborane by 4-pentenoic acid under the action of AlCl3 with the formation of 4-(o-carboran-9′-yl)valeric acid has been carried out.
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