Process for preparing 1,4-bis(5-amino-1-pyrazolyl)phthalazines and use thereof as dye intermediates

摘要

A new advantageous process for preparing 1,4-bis(5-amino-1-pyrazolyl)phthalazines of the formula IV, characterised in that 3-imino- or 3-keto-alkylnitriles of the formulae I or II in Claim 1 are reacted with 1,4-dihydrazinephthalazines of the formula III in Claim 1 to obtain compounds which are suitable for use as coupling components in the synthesis of azo dyes. <IMAGE>