To Isocyanates, Isothiocyanates, or Carbon Disulfide

For the reactions of 4-aminopyrazol-3-one 30 with alkyl or aryl isothiocyanates 

240a-l, the preferred conditions were boiling in methanol containing pyridine, 

Addition of the sulfur atom of 3-oxopyrazole-4-carbothioic acid hydrazide 242 to 

Pyrazol-3-ones 245a-f with methyl-A, /V-diethylaminoacetylene 246 in benzene at 

0 °C gave the addition products 247a,b,d-f in 80-90% yield but addition product 

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