Preparation of polyhydroxybenzenes by direct hydroxylation of ph

Details Preparation of polyhydroxybenzenes by direct hydroxylation of ph Preparation of polyhydroxybenzenes by direct hydroxylation of ph

1989-05-02

1991-01-01

Lone, Werren B.

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

Organic compounds

Oxygen containing

568767, C07C 3760, C07C 3908

Patent

active

049820133

ABSTRACT:
Polyhydroxybenzenes, e.g., the dihydroxybenzenes, are prepared by directly hydroxylating a phenol with nitrous oxide, preferably in vapor phase, on a substrate of acidified zeolite particulates, advantageously ZSM-5 zeolite particulates, and such acidified zeolite particulates advantageously having a molar ratio SiO.sub.2 /Al.sub.2 O.sub.3 of greater than about 90, preferably up to 500.

REFERENCES:
patent: 1547725 (1925-07-01), Bibb
patent: 4578521 (1986-03-01), Chang et al.
Suzuki et al, "Chemical Abstracts", vol. 109(10), p. 75661u (1988).
Iwamoto, "Patent Abstracts of Japan", vol. 10, No. 31(C-327) (1986), JP-A-60 184 036.
Iwamoto et al, "The Journal of Physical Chemistry", vol. 87, No. 6, 17 Mar. 1983, pp. 903-905.

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