Process for preparing 4'-methyl-2-cyanobiphenyl

Details Process for preparing 4'-methyl-2-cyanobiphenyl Process for preparing 4'-methyl-2-cyanobiphenyl

1997-12-22

1999-04-06

Richter, Johann

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

Organic compounds

Nitriles

C07C25500

Patent

active

058920943

ABSTRACT:
Process for preparing 4'-methyl-2-cyanobiphenyl, comprising, catalytically hydrogenating at least one brominated cyanobiphenyl compound selected from 4'-dibromomethyl-2-cyanobiphenyl and 4'-bromomethyl-2-cyanobiphenyl; and process for regenerating 4'-methyl-2-cyanobiphenyl, comprising, catalytically hydrogenating at least one brominated cyanobiphenyl compound selected from 4'-dibromomethyl-2-cyanobiphenyl and 4'-bromomethyl-2-cyanobiphenyl, contained in a filtrate prepared by brominating 4'-methyl-2-cyanobiphenyl in a solvent; crystallizing 4'-bromomethyl-2-cyanobiphenyl from the resulting reaction mixture; and removing the resulting crystals from the reaction mixture by filtration. 4'-Methyl-2-cyanobiphenyl can be used as starting materials for 4'-bromomethyl-2-cyanobiphenyl.

REFERENCES:
patent: 5288895 (1994-02-01), Bousset et al.
Marques, C.A., Selva, M., Tundo, P., "Hydrodehalogenation of Polyhalogenated Aromatics Under Multiphase Conditions with H2 and Metal Catalyst", Gazz. Chim. Ital., 126(6), 317-327, 1996.

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