Synthesis of pyrazole dyes

Details Synthesis of pyrazole dyes Synthesis of pyrazole dyes

C - Chemistry, Metallurgy

09

B

C09B 29/48 (2006.01) C09B 29/00 (2006.01) C09B 43/11 (2006.01)

Patent

CA 2057370

NOVEL SYNTHESIS OF PYRAZOLE DYES Abstract A process for preparing a l-alkyl-3-secondary or tertiary alkyl-4-cyano-pyrazol-5-yl azo dye or a 1- alkyl-3-aryl-4-cyano-pyrazol-5-yl azo dye comprising: a) reacting a 3-secondary or tertiary alkyl-4- cyano-5-amino pyrazole or a 3-aryl-4-cyano-5- amino pyrazole with a diazotizing reagent to form a pyrazol-5-yl diazonium salt; b) allowing said diazonium salt to react with an aromatic coupling component to form a 3- secondary or tertiary alkyl-4-cyano-pyrazol- 5-yl azo dye or a 3-aryl-4-cyano-pyrazol-5-yl azo dye; and c) reacting the product of step b) with an alkylating agent in the presence of a base to form a l-alky1-3-secondary or tertiary alkyl- 4-cyano-pyrazol-5-yl azo dye or a 1-alkyl-3- aryl-4-cyano-pyrazol-5-yl azo dye.

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