Preparation of aromatic/aliphatic nitriles
US4436669A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 14, 1982 |
| Grant date | Mar 13, 1984 |
| Priority date | — |
| Expiry date | May 14, 2002 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C253/20
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
Aromatic/aliphatic nitriles having the formula: EQU Ar--A--CN (I) wherein Ar is phenyl or substituted phenyl and A is a direct chemical bond or a hydrocarbon having from 1 to 6 carbon atoms, are conveniently prepared by heating to a temperature ranging from about 450.degree. C. to about 550.degree. C. a formamide or formanilide having the formula: EQU Ar--A--NHCHO (II) or an amide having the formula EQU Ar--A--CONH.sub.2 (III) in the presence of a fluorinated siliceous catalyst, said catalyst having been prepared by (i) impregnating a particulate silica containing from about 0.05 to about 2% by weight of fluorine, expressed as F.sup.- bonded to the silica, with a dilute aqueous solution of hydrofluoric acid, said hydrofluoric acid solution having a concentration in HF of less than about 5% by weight, and the ratio by weight of the hydrofluoric acid contained in said aqueous solution thereof to the silica being less than about 5%, followed by (ii) drying the catalyst thus impregnated.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.