O-alkylation of phenolic compounds via rare earth orthophosphate catalysts
US5786520A · kind A · utility
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33Claims
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Key dates
| Filing date | Oct 15, 1996 |
| Grant date | Jul 28, 1998 |
| Priority date | — |
| Expiry date | Oct 15, 2016 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C233/25
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
Carbocyclic/aliphatic ethers, for example anisole, quaicol, guaethol, p-methoxyphenol and ethylene dioxybenzene, are selectively prepared, in good yield, by reacting a phenolic compound, for example a phenol, hydroquinone, pyrocatechin, naphthol, or the like, with an alcohol, for example methanol, ethanol, isopropanol, ethylene glycol, etc., in gaseous phase, in the presence of a catalytically effective amount of a trivalent rare earth metal orthophosphate, for example a lanthanum, cerium or samarium orthophosphate, optionally doped with an alkali or alkaline earth metal, preferably cesium.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.