Synthesis of some new 1-aryl-4-formyl-3-(4-hydroxy-6-methyl-2-oxo-2H-pyran- 3-yl)pyrazoles using the Vilsmeier-Haack reaction - Isolation of the key intermediate 1-aryl-3-(4-hydroxy-6-methyl-2-oxo-2H-pyran-3-yl) pyrazoles
Arylhydrazones of dehydroacetic acid (DHA) underwent Vilsmeier-Haack reaction to generate the corresponding 1-aryl-4-formyl-3-(4-hydroxy-6-methyl-2- oxo-2H-pyran-3-yl)pyrazoles (1) with the pyrone moiety of the DHA remaining intact. However, when the reac
Kumar, Ajay,Prakash, Om,Kinger, Mayank,Singh, Shiv P.
The dehydroacetic acid hydrazinolysis produces the degradation of the pyranic ring and leads to bipyrazoles.The hydrazinolysis mechanism is described.Products have been characterized by NMR, 1H, IR, MS spectra and elemental analysis.Key Words: dehydroacet
Djerrari, B.,Essassi, E.,Fifani, J.
p. 521 - 524
(2007/10/02)
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