Process for the preparation of benzotriazoles

2-(2-Hydroxyphenyl)-2H-benzotriazoles of the formula 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...

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Bibliographische Detailangaben
Hauptverfasser:	PRESTEL, HELMUT, MAUL, RUDOLF
Format:	Patent
Sprache:	eng
Schlagworte:	ADHESIVES APPARATUS THEREFOR CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOIDCHEMISTRY CHEMISTRY COMPOUNDS THEREOF DYES GENERAL METHODS OF ORGANIC CHEMISTRY HETEROCYCLIC COMPOUNDS INORGANIC CHEMISTRY MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FORELSEWHERE METALLURGY MISCELLANEOUS APPLICATIONS OF MATERIALS MISCELLANEOUS COMPOSITIONS NATURAL RESINS NON-METALLIC ELEMENTS ORGANIC CHEMISTRY PAINTS PERFORMING OPERATIONS PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL POLISHES THEIR RELEVANT APPARATUS TRANSPORTING
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Beschreibung
Zusammenfassung:	2-(2-Hydroxyphenyl)-2H-benzotriazoles of the formula 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. 2-(2-Hydroxyphenyl)-2H-benzotriazoles of the formula (* CHEMICAL STRUCTURE *) 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.