Process for the preparation of N,N′-carbonylbislactams
US6699988B2 · kind B2 · utility
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13Claims
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Key dates
| Filing date | Apr 23, 2001 |
| Grant date | Mar 2, 2004 |
| Priority date | — |
| Expiry date | Jun 22, 2021 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07D227/087
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
The invention relates to a process for the preparation of N,N′-carbonylbislactams by reaction of phosgene with at least one lactam which is characterized in that the tertiary amine is chosen from the group consisting of non-nucleophilic aliphatic tertiary amines. N,N′-Carbonylbislactams of high purity are thus obtained with good yields, both in the laboratory and on the industrial scale.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.