p-Toluenesulfonic acid → HCID 20556953, compound

Participants

Reaction Steps

34 g of 3-{5-[2-(2,4-di-tert-amylphenoxy)butyramido]-2-chloroanilino}-1-(2,4,6-trichlorophenyl)-4-(1-pyrazolyl)-5-oxo-2-pyrazoline (prepared by the method described in German Patent Application (OLS) No. 2,536,191), 25 g of isopropenyl acetate and 0.5 g of p-toluenesulfonic acid were added to 250 ml of benzene and the mixture was refluxed for 5 hours. After the reaction, the reaction mixture was condensated under reduced pressure. Upon crystallization of the residue from a solvent mixture of benzene and hexane, 23 g of Coupler (2) was obtained. The melting point of the coupler was 102° to 108° C.

Provenance & Evidence