Hydroxylation of phenolic compounds

Details Hydroxylation of phenolic compounds Hydroxylation of phenolic compounds

1993-12-09

1995-07-18

Richter, Johann

Organic compounds -- part of the class 532-570 series

Organic compounds

Oxygen containing

568763, 568771, C07C 3708, C07C 3910, C07C 3700

Patent

active

054343178

ABSTRACT:
Phenolic compounds, e.g., phenol, are hydroxylated, preponderantly into the para-isomer, e.g., hydroquinone, by reaction with hydrogen peroxide in the presence of an effective amount of a strong acid and a catalytically effective amount of a keto compound having the formula (II): ##STR1## in which R.sub.1 and R.sub.2, which may be identical or different, are each a hydrogen atom or an electron-donating group; n.sub.1 and n.sub.2, which may be identical or different, are numbers equal to 0, 1, 2 or 3, with the proviso that the two carbon atoms located at the .alpha.-position with respect to the two carbon atoms bearing the --CO group may be bonded together via a valence bond or via a --CH.sub.2 -- group, thereby forming a keto-containing ring member which may either be saturated or unsaturated.

REFERENCES:
patent: 3849502 (1974-11-01), Bourdin et al.
patent: 4072006 (1978-02-01), Umemura et al.

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