Process for the preparation of o-methallyloxyphenol by the selec

Details Process for the preparation of o-methallyloxyphenol by the selec Process for the preparation of o-methallyloxyphenol by the selec

1979-06-18

1981-02-24

Helfin, Bernard

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

Organic compounds

Oxygen containing

568651, 568568, 568766, C07C 4101

Patent

active

042529859

ABSTRACT:
The process relates to the preparation of o-methallyloxyphenol by the action of methallyl chloride on pyrocatechol in the presence of a basic agent.
It consists in carrying out the reaction in a two-phase liquid reaction medium comprising water and a water-immiscible organic solvent, at a temperature between 50.degree. and 140.degree. C., in the presence of a catalyst chosen from amongst quaternary ammonium derivatives and phosphonium derivatives, using, as the basic agent, an alkali metal or alkaline earth metal hydroxide or an alkali metal carbonate or bicarbonate.
It makes it possible to obtain the monoether selectively by minimizing the formation of diether and of alkylation products of the benzene nucleus of the pyrocatechol.

REFERENCES:
patent: 3274260 (1966-09-01), Levy et al.
patent: 3474171 (1969-10-01), Scharpf
patent: 3689570 (1972-09-01), Gradeff et al.
patent: 3927118 (1975-12-01), Ozretich
Laskina et al., Chemical Abstracts, vol. 61 (1964), 11919 (b-d).
McKillop et al., Tetrahedron, vol. 30 (1974), 1379-1382.

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