Process for the preparation of acid chlorides by phosgenation of acids, and catalysts for this process
US4806286A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 23, 1986 |
| Grant date | Feb 21, 1989 |
| Priority date | — |
| Expiry date | Jul 23, 2006 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C51/60
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
The invention relates to a new process for the preparation of carboxylic acid chlorides by phosgenation of the corresponding carboxylic acid in the presence of a catalyst. This process is characterized in that the said catalyst is chosen from the compounds represented by the formulae ##STR1## in which R.sub.1 to R.sub.6, which are identical of different, denote: aliphatic, alicyclic, araliphatic or aromatic radicals, or form, in pairs, with the nitrogen atom to which they are attached or with the N-C-N group, a 5- or 6-membered heterocyclic ring. The process applies to most carboxylic acids. The acid chlorides obtained are known and used to produce radical polymerization initiators or pesticides.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.