作者:W.J. Mijs、O.E. van Lohuizen、J. Bussink、L. Vollbracht
DOI:10.1016/0040-4020(67)80061-9
日期:1967.5
starting 4-aryloxyphenol: a homolyticfission mechanism (two dimeric phenols yielding monomer and trimer as primary products), or an intramolecular rearrangement mechanism (two dimeric molecules giving a tetramer as a primary product). The tetramers are not formed by direct coupling of 4-aryloxyradicals, the oxygen of one radical attacking thepara position of the terminal ring of the other. Experimental
Mechanistic investigations on the oxidativecoupling of 2,6-dimethylphenol have led to the development of a selective and efficient procedure to prepare 3,5,3',5'-tetramethyl-biphenyl-4,4'-diol, via a C-C coupling, mediated by a hypervalent form of iodine, i.e. (diacetoxyiodo)benzene and for which a mechanism is proposed.