Polyhedral monocarbaborane chemistry. Carboxylic acid derivatives of the [closo-2-CB9H10]− anion

Abstract

Reaction of B₁₀H₁₄ with para-(OHC)C₆H₄(COOH) in aqueous KOH gives the [nido-6-CB₉H₁₁-6-(C₆H₄-para-COOH)]⁻ anion 1 which upon cluster closure with iodine in alkali solution gives the [closo-2-CB₉H₉-2-(C₆H₄-para-COOH)]⁻ anion 2; an analogous procedure with B₁₀H₁₄ and glyoxalic acid OHCCOOH gives the [closo-2-CB₉H₉-2-(COOH)]⁻ anion 4via the [arachno-6-CB₉H₁₃-6-(COOH)]⁻ anion 3.