SYNTHESIS AND ESR-SPECTRA OF PERSISTENT AROXYLS .6. 1-(3,5-DIALKYL-4-HYDROXYBENZYL)-PYRAZOLE AND 1-(3,5-DIALKYL-4-HYDROXYBENZYL)-PYRAZOL-5-ONE DERIVATIVES, AND THEIR CORRESPONDING AROXYLS

The title compounds were prepared from 3,5-dialkyl-4-hydroxy-benzylhyd razine and symmetrically substituted beta-di-ketones (acetylacetone or dibenzoylmethane) or ethyl acetoacetate; the two alkyl groups ortho t o the phenolic hydroxy group are either two t-butyl groups, or one met hyl and one t-butyl group. On oxidation of the di-t-butyl derivatives, persistent aroxyls were obtained, whose ESR spectra are described.