New Stable Neutral Radical with Intramolecular Hydrogen Bonding:  Synthesis and Characterization of 2,5,8-Tri-<i>tert</i>-butyl-7-hydroxy-6-oxophenalenoxyl

Abstract

A new stable neutral radical with intramolecular hydrogen bonding, 2,5,8-tri-tert-butyl-7-hydroxy-6-oxophenalenoxyl, was synthesized from the corresponding dihydroxyphenalenone and isolated as a stable solid under air atmosphere at room temperature. The structure was unequivocally determined by means of IR spectra, ESR/ENDOR techniques, and DFT calculations.