Catalyst and process for the preparation of trifluoromethyltolue

Details Catalyst and process for the preparation of trifluoromethyltolue Catalyst and process for the preparation of trifluoromethyltolue

1991-06-21

1992-06-30

Mars, Howard T.

Organic compounds -- part of the class 532-570 series

Organic compounds

Halogen containing

C07C 25125

Patent

active

051264978

ABSTRACT:
A partially deactivated reduction catalyst is prepared by reacting palladium on alumina catalyst with benzotrifluoride in an amount of 0.1 to 10.0 millimoles of benzotrifluoride per gram of alumina and hydrogen in an amount ranging from 10 to 2000 moles of hydrogen per mole of benzotrifluoride at a temperature of 200.degree. C. to 300.degree. C. for 30 minutes to 2 hours. The catalyst is useful for the reduction of trifluoromethylbenzonitriles and trifluoromethylbenzylamines to produce the corresponding trifluoromethyltoluenes in high yields. The catalyst is also useful in other hydrogen reduction reactions, e.g., for conversion of o-chlorobenzonitrile, o-chlorobenzylamine and mandelonitrile to toluene and for conversion of phenethylamine to ethylbenzene.

REFERENCES:
Brown, George R., et al. "Direct Transformation of Cyano into Methyl Groups under Mild Conditions" Communications Dec. 1982, pp. 1036-1037.

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