Process for preparing alkyl 4,4'-(ethylenedioxy)bis-benzoates
US3981906A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 7, 1975 |
| Grant date | Sep 21, 1976 |
| Priority date | — |
| Expiry date | May 7, 1995 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C69/76
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
Alkyl 4,4'-(ethylenedioxy)bis-benzoates having improved properties such as anti-oxidation and anti-coloration are prepared in high yield and selectivity by, at the first step, reacting an excess alkyl p-hydroxybenzoate with a recycling alkyl p-(2-chloro-ethoxy)benzoate with heating in the presence of an alkali carbonate and an inert organic solvent until almost said alkyl p-(2-chloroethoxy)benzoate is consumed to produce an alkyl 4,4'-(ethylenedioxy)bis-benzoate and at the second step adding ethylene dichloride to the reaction system and continuing the heating to produce an alkyl p-(2-chloroethoxy)benzoate which is recycled, and separating the alkyl 4,4'-(ethylenedioxy)bis-benzoate produced.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.