ISSN:
1434-4475
Keywords:
4-Benzoyl-1,5-diphenyl-pyrazol-3-carboxylic acid
;
5-Benzoyl-2,6-diphenyl-4-hydroxy-pyridazin-3-one
;
X-Ray structure analysis
;
15N and13C-NMR spectroscopy
Source:
Springer Online Journal Archives 1860-2000
Topics:
Chemistry and Pharmacology
Notes:
Abstract 4-Benzoyl-5-phenyl-furan-2,3-dione (1) reacts with various phenylhydrazones2 at 60–80°C to the pyrazole carboxylic acid3 a, which then can be decarboxylated to 4-benzoyl-1,5-diphenyl-pyrazole (5).1 and phenylhydrazine combine again yielding3 a as the main product and the isomeric pyridazinone6 as by-product. At higher temperatures (120–140°C) the reaction of1 with2 a leads to the formation of dibenzoyl acetic acid hydrazide derivatives8. The structures of all products were confirmed by IR, MS,15N- and13C-NMR spectroscopic measurements, in the case of the pyridazinone6 also by an X-ray study.6 crystallizes with one moleDMSO monoclinically in space group P 21/n (Nr. 14) with 4 molecules6 andDMSO per cell. The reaction pathways leading to the compounds3, 6 and8 are discussed.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00809443
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