The catalytic oxidation of 4-aryloxyphenols

摘要: Abstract The mechanism of the Cu+/amine catalysed oxidation a number substituted 4-aryloxyphenols (dimeric phenols) has been studied by analysis primary reaction products. Quinone ketals are postulated as intermediates which can be decompose in two ways, depending on substitution pattern starting 4-aryloxyphenol: homolytic fission (two dimeric phenols yielding monomer and trimer products), or an intramolecular rearrangement molecules giving tetramer product). tetramers not formed direct coupling 4-aryloxyradicals, oxygen one radical attacking thepara position terminal ring other. Experimental evidence is presented for mechanisms proposed.