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Spectroscopic Studies of the Keto and Enol Tautomers of 1-Phenyl-3-Methyl-4-Benzoyl-5-Pyrazolone

✍ Scribed by Yoshifumi Akama; Aijun Tong

Publisher
Elsevier Science
Year
1996
Tongue
English
Weight
100 KB
Volume
53
Category
Article
ISSN
0026-265X

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✦ Synopsis

Molecular structures of the two tautomers of a ␤-diketone 1-phenyl-3-methyl-4-benzoyl-5pyrazolone (PMBP) were studied by MS, UV, IR, and X-ray diffraction methods. The mass spectra show little difference for the two forms of PMBP, while there are notable differences in the IR spectra as KBr pellets and in the UV spectra in different solvents for the keto-and enol-PMBP. The ketoand enol-PMBP were stabilized respectively by intermolecular and intramolecular hydrogen bonds. The two types of hydrogen bonds were characterized by X-ray diffraction. Infrared spectrometric analyses depending on temperature were also performed to study the thermal properties of PMBP.

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