Process for the production of dihydroxybenzenes

Details Process for the production of dihydroxybenzenes Process for the production of dihydroxybenzenes

1984-03-08

1985-08-06

Lone, Werren B.

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

Organic compounds

Oxygen containing

568629, 568733, 568741, 568768, C07C 3700

Patent

active

045337667

ABSTRACT:
The known nuclear hydroxylation of substituted phenols or phenol ethers with organic solutions of hydrogen peroxide in the presence of a catalyst is carried out in improved manner by employing both (1) a special, practically water free solution of hydrogen peroxide in an organic solvent which forms an azeotrope with water, which azeotrope boils below the boiling point of hydrogen peroxide, and (2) sulfur dioxide as a catalyst. Through this, the nuclear hydroxylation is substantially simpler than previously; difficult separations, e.g., from water-phenol, or the separation and recovery of the catalyst are eliminated. Besides, the yields are increased.

REFERENCES:
patent: 2900412 (1959-08-01), Toland
patent: 3943179 (1976-03-01), Bost et al.
patent: 4053523 (1977-10-01), Seifert et al.
patent: 4111967 (1978-09-01), Martin et al.
patent: 4258219 (1981-03-01), Kato et al.

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