A Cyclotriborane Dianion and the Triboron Cation: "Light Ends" of the Hückel Rule

Abstract

The lightest synthetically accessible Hückel π-aromatic system, a triboracyclopropenyl dianion bearing three dicyclohexylamino groups, has been obtained by reduction of dicyclohexylaminoboron dichloride and structurally characterized as the dimeric disodium salt (see scheme; Cy=cyclohexyl, DME=1,2-dimethoxyethane).

Keywords: Hückel rule; aminoboron halides; aromaticity; boron; dehalogenation.