Process for the preparation of mono-condensation derivatives of adipic acid
US5286879A · kind A · utility
2Cited by
8References
29Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 5, 1992 |
| Grant date | Feb 15, 1994 |
| Priority date | — |
| Expiry date | Oct 5, 2012 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07D313/04
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
An improved process for preparing mono-condensation derivatives of adipic acid with fewer steps and better purity is disclosed. In particular, this process comprises: (a) forming relatively concentrated and pure cyclic monomeric adipic anhydride by depolymerization and concentration starting from polymeric adipic anhydride; and (b) adding a condensation reactant having an active hydrogen, e.g., a primary or secondary amine, to said cyclic monomeric adipic anhydride to form the corresponding mono-condensation derivative of adipic acid.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.