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US 4,189,580 AGranted
Process for the preparation of nitriles
AssigneeBayer Aktiengesellschaft
InventorKurt Findeisen
Life of this patent
Estimating the term…
Abstract
A process for the preparation of a nitrile of the formula R--(CN).sub.n' wherein R represents an optionally substituted alkyl, cycloalkyl or aryl radical or an optionally substituted 5- or 6-membered heterocyclic radical which may additionally be fused with a benzene ring and n' represents 1 to 6 which comprises contacting a carboxylic acid of the formula R--(COOH).sub.n' wherein R and n' have the meanings given above with cyanogen chloride and/or cyanogen bromide at a temperature in the range of 100.degree. to 300.degree. C.
Claims8
A process for the preparation of a nitrile of the formula
- R--(CN).sub.n'
- wherein R represents unsubstituted alkyl or substituted alkyl substituted by chlorine, bromine, methoxy, alkoxy, nitrilo, methoxycarbonyl, or ethoxycarbonyl, unsubstituted cycloalkyl or substituted cycloalkyl substituted by chlorine, bromine, methoxy, ethoxy, nitrilo, methoxycarbonyl, ethoxycarbonyl, methyl, ethyl, propyl or isopropyl, unsubstituted aryl radical or substituted aryl substituted by chlorine, bromine, nitro, methoxy, ethoxy, nitrilo, methoxycarbonyl, ethoxycarbonyl, methyl, ethyl, propyl, isopropyl or tert.-butyl or unsubstituted 5- or 6-membered heterocyclic radical or substituted 5- or 6-membered heterocyclic radical which may additionally be fused with a benzene ring where the substituents are methyl, ethyl, chloro, bromo, nitro, methoxycarbonyl, ethoxycarbonyl or nitrile and n' represents 1 to 6 which comprises contacting a carboxylic acid of the formula
- R--(COOH).sub.n'
- wherein R and n' have the meanings given above with cyanogen chloride and/or cyanogen bromide at a temperature in the range of 100.degree. to 300.degree. C.
1 more element
Dependencies are inferred from the claim text.