Process for the preparation of epsilon-caprolactam and epsilon-caprolactam precursors
US5700934A · kind A · utility
54Cited by
10References
14Claims
0Family size
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Key dates
| Filing date | Mar 15, 1996 |
| Grant date | Dec 23, 1997 |
| Priority date | — |
| Expiry date | Mar 15, 2016 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07D201/08
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
A process for the preparation of .epsilon.-caprolactam and .epsilon.-caprolactam precursors, starting from the corresponding 5-formylvalerate ester, ammonia and hydrogen in the presence of a hydrogenation catalyst is disclosed, wherein in a step (a) 5-formylvalerate ester is reacted with ammonia under non-hydrogenating conditions, and in a step (b) the reaction product obtained in step (a) is converted to .epsilon.-caprolactam and the .epsilon.-caprolactam precursor(s) under hydrogenating conditions, in the presence of ammonia.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.