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1 Polish Journal of Chemistry

1 2004

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Synthesis and structure of Two thiocarboxypyrazolic Acid Derivatives

Główka M., Błaszczyk M., Prentjas Ch., Kovala-Demertzi D.

Polish Journal of Chemistry

2004

Vol.78 /nr 11-12

2013-2022

Two thiocarboxypyrazolic acid amide derivatives were obtained unintentionally in a reaction of thiosemicarbazone with 2-acetylbutyrolactone, and structures of the final products have been determined by X-ray diffraction. Due to conjugation of the thioamide group with the planar pyrazolic ring, the molecule is flat, except 2-hydroxylethyl chain, accidentally adopting similar conformation in the two studied molecules. Also similar is the packing, despite different hydrogen bonding schemes, resulting from the different number of donoric H atoms and the presence of an additional water molecule in the second compound. The mechanism of the reaction is suggested.