The reaction of 3-[(alkylsulfanyl)methyl]pentane-2,4-diones with nicotinic hydrazide in ethanol as solvent produces 4-[(alkylsulfanyl)- methyl]-substituted 1-(pyridin-3-yl)carbonyl-1H-pyrazoles, whereas 1-acyl-1H-pyrazoles are formed in acetic, propanoic, or pentanoic acid solution. The reaction in methanol in the presence of ZnCl₂ is accompanied by elimination of nicotinic acid and the formation of (alkylsulfanyl)methyl-substituted 1H-pyrazoles.

中文翻译：

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3-[（烷基硫烷基）甲基]戊烷-2,4-二酮与烟酰胺的反应

3-[（烷基硫烷基）甲基]戊烷-2,4-二酮与烟酰胺在乙醇中的溶剂反应生成4-[（烷基硫烷基）-甲基]-取代的1-（吡啶-3-基）羰基-1 H -吡唑，而1-酰基-1 H-吡唑在乙酸，丙酸或戊酸溶液中形成。在ZnCl ₂存在下在甲醇中的反应伴随有烟酸的消除和（烷基硫烷基）甲基取代的1 H-吡唑的形成。