29214-73-1

Upstream product

• 100-63-0 phenylhydrazine 
• 520-45-6 Dehydracetic acid 
• 16807-48-0 3‐acetyl‐2‐hydroxy‐6‐methyl‐4H‐pyran‐4‐one 

Downstream Products

• 100-63-0 phenylhydrazine 
• 265097-83-4 3-(4-hydroxy-6-methyl-2-oxo-2H-pyran-3-yl)-1-phenylpyrazole 
• 137934-94-2 3-hydroxy-5-methyl-4-<3'-methyl-1'-phenylpyrazol-5'-yl>-1-phenylpyrazole 

Relevant academic research and scientific papers

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

Dehydroacetic acid hydrazinolysis

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