M. Lanfranchi et al., FACILE BENZENE-RING CONTRACTION TO CYCLOPENTENE DERIVATIVES DURING THE COPPER PROMOTED OXIDATION OF PHENOL WITH DIOXYGEN, Journal of molecular catalysis. A, Chemical, 101(1), 1995, pp. 75-80
The oxidation of phenol with dioxygen in the presence of copper metal,
primary alcohols and pyridine, under mild conditions, produces new co
mpounds deriving from the aromatic ring contraction (alkyl 2-oxo-4,5,5
-trialkoxycyclopent-3-ene-1-carboxylate 2) which were characterized by
H-1 and C-13-NMR. In particular an X-ray study of the methyl derivati
ve is reported.