Process for the preparation of aromatic carboxamides from aromatic carboxylic acids and urea
US5550286A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 12, 1994 |
| Grant date | Aug 27, 1996 |
| Priority date | — |
| Expiry date | Dec 12, 2014 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C231/02
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
Process for the of aromatic carboxamides from aromatic carboxylic acids and urea Process for the preparation of aromatic carboxamides of the formula (I) ##STR1## in which R.sub.1, R.sub.2, and R.sub.3 are identical or different and are hydrogen, fluorine, chlorine or bromine atoms, or are alkyl(C.sub.1 -C.sub.4), hydroxyl or nitro groups, or R.sub.1 and R.sub.2 form an aromatic ring of 5 or 6 ring members, which ring may be substituted by fluorine, chlorine or bromine atoms or by alkyl(C.sub.1 -C.sub.4), hydroxyl or nitro groups, which involves reacting aromatic carboxylic acids of the formula (II) ##STR2## in which R.sub.1, R.sub.2 and R.sub.3 are as defined above with urea in an inert organic solvent with the addition of a catalytic amount of phosphorous acid.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.