Process for preparing cyclic urea derivatives
US4617400A · kind A · utility
5Cited by
1References
8Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 11, 1985 |
| Grant date | Oct 14, 1986 |
| Priority date | — |
| Expiry date | Sep 11, 2005 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07D233/32
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
A process for preparing a cyclic N,N'-dimethyl urea derivative by reacting a cyclic urea compound with formaldehyde, in a medium, in the presence of hydrogen and a hydrogenation catalyst. The reaction is carried out in the presence of a solid acid obtained by calcining sulfuric acid and aluminum oxide or sulfuric acid, phosphoric acid and aluminum oxide.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.