Synthesis and structure of 3-arylazo derivatives of ortho-carborane

Abstract

A series of B-substituted arylazo derivatives of ortho-carborane, 3-XC₆H₄-NN-1,2-C₂B₁₀H₁₁ (X = p-NMe₂, p-OMe, o-Me), were synthesized by reaction of its diazonium derivative [3-N₂-o-C₂B₁₀H₁₁][BF₄] with aryl Grignard reagents. The treatment of 3-arylazo-ortho-carboranes with CsF in refluxing ethanol results in their selective decapitation with the formation of the corresponding 3-arylazo-nido-carboranes Cs[3-XC₆H₄-NN-7,8-C₂B₉H₁₁].