Process for the production of dihydroxybenzenes

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

1984-03-13

1985-11-05

Helfin, Bernard

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

Organic compounds

Oxygen containing

568629, 568733, 568736, 568741, 568743, 568747, 568765, 568766, 560 70, C07C 3760, C07C 4126

Patent

active

045515620

ABSTRACT:
The nuclear hydroxylation of phenol 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 does not form an azeotrope with water or whose highest azeotrope with water, boil near or above the boiling point of hydrogen peroxide, and (2) employing as a catalyst XO.sub.2 where X is sulfur, selenium, or tellurium. Besides increasing the yield and the ability to carry out the reaction in a simpler manner when selenium dioxide is employed as a catalyst, there can also be controlled the ortho-para ratio, respectively, the ortho-ortho ratio of the product.

REFERENCES:
patent: 3943179 (1976-03-01), Bost et al.
patent: 4174460 (1979-11-01), Seifert et al.

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