[C:1]1(=[O:7])O[C:4](=[O:5])[CH:3]=[CH:2]1.S(O)(O)(=O)=O.[CH:13]([NH:16][NH2:17])([CH3:15])[CH3:14]>O.Cl>[CH:13]([N:16]1[C:4](=[O:5])[CH:3]=[CH:2][C:1]([OH:7])=[N:17]1)([CH3:15])[CH3:14]The following example illustrates the preparation of the novel compounds: ##STR6## 58.8 g (0.6 mol) of maleic anhydride were added to a solution of 73.8 g (0.6 mol) of isopropylhydrazine sulphate in 180 ml of water and 10 ml of concentrated hydrochloric acid at 60° C. The mixture was then boiled for 3 hours under reflux after which it was cooled to 0° C. After half an hour, the product which had precipitated was filtered off. 59 g (64% of theory) of 1-isopropyl-1,6-dihydro-3-hydroxy-6-oxo-pyridazine were thus obtained in the form of colorless crystals of melting point 148° C.
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