Synthesis of some new azopyrazole dyes

A variety of new azopyrazolo [1,5-c]-as-triazine dyes have been synthesised via diazotisation of 3-amino-4-arylazo-1-pyrazolin-5-one and coupling with active hydrogen reagents. These dyed nylon 6, nylon 66, acrylic, polyester, silk and wool with colours ranging from scarlet red to dark brown and may find useful applications.