Process for the preparation of amino- and hydroxybenzonitriles

Details Process for the preparation of amino- and hydroxybenzonitriles Process for the preparation of amino- and hydroxybenzonitriles

B - Operations, Transporting

01

J

B01J 27/16 (2006.01) C07C 253/22 (2006.01) C07C 255/53 (2006.01) C07C 255/58 (2006.01)

Patent

CA 2177939

The present invention provides a process for the preparation of amino- or hydroxybenzonitriles of the general formula: Image (I) in which X is an amino or hydroxyl group and the phenyl radical optionally carries additional alkyl substit- uents, by reaction of amino- or hydroxybenzoic acid derivatives of the general formula: Image (II) in which R is a hydrogen atom or an alkyl radical containing up to 4 carbon atoms and the phenyl radical and X have the same meaning as above, with ammonia, wherein the reaction is carried out at a temperature of from 280 to 450°C in the presence of a boron phosphate carrier catalyst which is doped with trans- ition metal compounds of the 5th, 6th, 12th or 14th Group of the Periodic System of elements or with combinations thereof and the specific surface of which is at least 400 m2/g. The present invention also provides boron phosphate carrier catalysts which are doped with one or more transition metal compounds of the 5th, 6th, 12th or 14th Group of the Periodic System of elements and the specific surface of which is at least 400 m2/g. With the use of the process and catalysts according to the present invention, amino- and hydroxybenzoic acids and the esters thereof can be selectively converted in high yields with high catalyst loading into amino- and hydroxybenzo- nitriles.

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