99378-27-5

Upstream product

• 3142-58-3 3,3-dimethyl-2,4-pentanedione 
• 100-63-0 phenylhydrazine 
• 53722-07-9 2,3-dimethyl-pent-4-yne-2,3-diol 

Downstream Products

• 107590-19-2 1-phenyl-5-phenylhydrazino-3,4,4,5-tetramethyl-2-pyrazoline 
• 107590-21-6 Trifluoro-acetate3,4,4,5-tetramethyl-1-phenyl-4H-pyrazol-1-ium; 

Relevant academic research and scientific papers

REACTION OF 3,3-DIMETHYL-2,4-PENTANEDIONE WITH ALKYL- AND ARYLHYDRAZINES

Depending on the conditions and on the substituent, the reaction of 3,3-dimethyl-1,4-pentanedione with alkyl- and arylhydrazines can be used for the synthesis of the corresponding mono- and bishydrazones and also substituted 5-hydroxy-, 5-hydrazino-, or 5-methylene-2-pyrazolines.The addition of trifluoroacetic acid, water, hydrazines, and amines to the latter was studied.For the "unsymmetrical" products from addition of the hydrazines to the substituted 5-methylene-2-pyrazolines an equilibrium or mutual transition between the two 5-hydrazino-2-pyrazoline forms is observed.