Process for monohydroxylation of phenolic compounds

Details Process for monohydroxylation of phenolic compounds Process for monohydroxylation of phenolic compounds

1993-02-26

1994-07-19

Lone, Werren B.

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

Organic compounds

Oxygen containing

568717, 568741, 568771, 568798, C07C 3760

Patent

active

053311035

ABSTRACT:
The present invention relates to a process for monohydroxylation of phenolic compounds which allows an increase in the amount of para isomer.
The invention relates to a process for monohydroxylation of a phenolic compound having a hydrogen atom in the para position to the hydroxyl group, for the purpose of obtaining a dihydroxylated aromatic compound by reacting the initial phenolic compound with hydrogen peroxide in the presence of an effective amount of a strong acid and of a ketonic compound, said process being characterized by the fact that the reaction is carried out in the presence of an effective amount of a polar aprotic organic solvent with a basicity such that it has a "donor number" below 25.

REFERENCES:
patent: 4078006 (1978-03-01), Umemura et al.
patent: 4214105 (1980-07-01), Seifert et al.
patent: 5097078 (1992-03-01), Constantini et al.
Chemical Abstracts, vol. 113, No. 3, Jul. 16, 1990, Columbus, Ohio; abstract no. 23364n, K. Yorozu et al, "Preparation of polyhydric phenols as stabilizers & antioxidants", p. 606, col. 2, & JP-A-0 278 641 (Mitsui Petrochemical Industries, Ltd.)

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