Process for obtaining aryl esters by O-dealkylation and applications
US5283358A · kind A · utility
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19Claims
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Key dates
| Filing date | Dec 10, 1992 |
| Grant date | Feb 1, 1994 |
| Priority date | — |
| Expiry date | Dec 10, 2012 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C67/24
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
Process for obtaining aryl esters by O-dealkylation of an alkyl aryl ether with an acyl halide in the presence of a catalyst chosen from hexaalkylguanidinium salts and tetraalkylphosphonium salts. The alkyl aryl ether corresponds preferentially to the formula Ar(OR).sub.n in which R denotes an alkyl group, in particular a methyl group, n is an integer from 1 to 6 and Ar represents a C.sub.6 to C.sub.14 aromatic radical, a coumarinyl group or a group of a number of phenyl radicals. This process allows also the obtention of aromatic polyester.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.