Etude de l'oxydation di tri-t-butyl-2,4,6 phenol par l'acide chloro-3 perbenzoique en present de divers hemines modeles utilisees entant que catalyseurs
3′,5′-Di-t-butyl-coclaurine, its N-methyl and its N,N-dimethylderivatives have been synthesized. The existence of intermediate phenoxy radicals on dehydrogenation in vitro is suggested by ESR spectra. Depending on the degree of methylation of the nitrogen atom the final products of the dehydrogenation with either PbO2 or alkaline K3Fe(CN)6 solution are formed by fragmentation of the benzylic CC bond
Reaction of superoxo Co(III) complexes with 2,6-di--butyl--benzoquinone methides
作者:A. Nishinaga、H. Tomita、Y. Tarumi、T. Matsuura
DOI:10.1016/0040-4039(80)80156-0
日期:1980.1
SuperoxoCo(III) complexes derived from Co(Salpr) and [Co(CN)5]3− reacted with 2,6-di--butyl--benzoquinonemethides to give 2,6-di--butyl--benzoquinone and 2,6-di--butyl-2,5-cyclohexadienonespirooxiranes as the main products, which are considered to result from nucleophilic attack by the superoxo species on the exo double bond of the quinone methides.
The oxidation of 4,4′-(trimethylene)bis(2,6-di-t-butylphenol) with lead dioxide underwent intramolecular cyclization at the 4,4′-positions to give a dispiro-compound. Irradiation of the dispiro-compound in a methylcyclohexane matrix at −150 °C produced 4,4′-(trimethylene)bis(2,6-di-t-butylphenoxy) diradical which has a stable triplet state.