New Methods for the Synthesis of Alkoxy Derivatives of the closo-Decaborate Anion [2-B10H9(OR)]2–, Where R = C2H5, iso-C3H7, С4H9

A two-stage scheme was proposed for the synthesis of alkoxy derivatives of the closo-decaborate anion [B10H9(OR)]2–, where R = C2H5, iso-C3H7, C4H9. At the first stage, the oxonium derivatives with the general formula [B10H9(OR2)]– were synthesized by the reaction between the [B10H11]–anion and acyclic ethers. At the second stage, the synthesized oxonium derivatives reacted with hydrazine hydrate to form the alkoxy derivatives with the general formula [B10H9(OR)]2–, where R = C2H5, iso-C3H7, C4H9. This approach appreciably increased the yield of target products and simplified their separation. The alkoxy derivatives were separated and characterized by IR and 1H, 11B, and 13C NMR spectroscopy.