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The diazonium salt o f 3-aminopyrazolopyridine when treated with SO: and CuCU produces the corresponding sulphonyl chloride. The sulphonyl chloride chloride easily reacts with hy drazine hydrate, amm onia, aromatic or heterocyclic amines to produce the corresponding sulphohydrazide, sulphonamide or N-sulphonam ide derivatives. Sulphohydrazide reacts with acetylacetone to produce pyrazoly pyrazolopyridinyl sulphone which is also obtained by reac tion o f sulphonyl chloride with dimethylpyrazole. The aminopyrazolopyridine can be converte into pyrazolopyridinthiole by its reacting with ethyl dithioxanthate. The pyrazolopyridinthiole reacts with alkyl halides or acrylonitrile to produce S-alkylated derivatives.