Process for the preparation of benzotriazoles

Details Process for the preparation of benzotriazoles Process for the preparation of benzotriazoles

C - Chemistry, Metallurgy

07

D

260/313.1

C07D 249/20 (2006.01)

Patent

CA 2025631

A-17750/+/CGM 358 Process for the preparation of benzotriazoles Abstract of the disclosure 2-(2-Hydroxyphenyl)-2H-benzotriazoles of the formula Image I, in which R is hydrogen, C1-C12alkyl or C1-C4alkoxy, R1 is hydrogen, C1-C12alkyl,C5-C6cycloalkyl, phenyl or phenyl-C1-C4alkyl and R2 is C1-C12alkyl, C5-C6cycloalkyl, phenyl, phenyl-C1-C4alkyl or a group -CnH2n-COOR3, in which n is 0 to 4 and R3 is hydrogen or C1-C12alkyl, can be prepared particularly advantageously by catalytic hydrogenation of a suitable o-nitroazo compound in the presence of a Pt, Pd, Pt/Pd or Rh hydrogenation catalyst and an alkylenediamine or an acyclic or cyclic polyalkylene polyamine in a halogenated or nonhalogenated aromatic hydrocarbon as solvent.

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