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NMR spectroscopic elucidation of the structure and stereochemistry of tricyclic 3-styrylpyrazolines |
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| Authors: | Tóth Gábor Simon András Jenei Attila Jeko József Lévai Albert |
| Institution: | Department of Inorganic and Analytical Chemistry, Budapest University of Technology and Economics, Szent Gellért tér 4, H-1111 Budapest, Hungary. gabor.toth@mail.bme.hu |
| Abstract: | Diastereomeric mixtures of tricyclic 3-styrylpyrazolines have been prepared by the reaction of 3-cynnamylidenechroman-4-ones and their 1-thio analogs with hydrazine in hot acetic acid or propionic acid solutions. The diastereomeric mixtures were separated by column chromatography to obtain the pure diastereomers. The elucidation of their structure and stereochemistry and complete (1)H and (13)C assignments have been performed by a combination of various one- and two-dimensional NMR experiments. |
| Keywords: | 3‐cinnamylidenechroman‐4‐ones 3‐cinnamylidene‐1‐thiochroman‐4‐ones tricyclic 3‐styrylpyrazolines 1H NMR 13C NMR stereochemistry 13C 1H coupling constants |
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