Process for the preparation of o-methallyloxyphenol by the selective monoetherification of pyrocatechol
US4252985A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 18, 1979 |
| Grant date | Feb 24, 1981 |
| Priority date | — |
| Expiry date | Jun 18, 1999 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C41/16
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.