Process for preparation of aromatic compounds
US6274770A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 13, 1999 |
| Grant date | Aug 14, 2001 |
| Priority date | — |
| Expiry date | Sep 13, 2019 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C45/36
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
##STR1## There is disclosed a process for the preparation of a compound of general formula (I), wherein Y and Z each independently represent a fluorine atom or a hydroxy group, and a, b, c and d independently represent 0, 1, 2 or 3 provided that the sum of a, b, c, and d is 1, 2, 3 or 4; the process comprising treating a compound of general formula (II), wherein a, b, c, and d are as described above and L.sup.1 and L.sup.2 each independently represent an active group provided that either Y and L.sup.1 are different or Z and L.sup.2 are different, with a fluorinating system in the presence of oxygen. A preferred compound of general formula (I) is 4,4'-difluorobenzophenone which may be prepared from 4,4'-dinitrophenylmethane using tetramethylammonium fluoride.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.