119908-96-2

Upstream product

• 881-05-0 3-Methyl-1-phenyl-2-pyrazoline-4,5-dione 
• 117506-45-3 2-(1,5-dihydro-3-methyl-5-oxo-1-phenyl-4H-pyrazol-4-ylidene)propanedinitrile 
• 106-47-8 4-chloro-aniline 
• 109-77-3 malononitrile 
• 50818-04-7 4-(4-chloro-phenylimino)-5-methyl-2-phenyl-2,4-dihydro-pyrazol-3-one 

Relevant academic research and scientific papers

α-Arylamino-cyanomethylene-pyrazolinones from Azomethine Dyes and Malonodinitrile

The reaction of azomethine dyes (1a-g) with malonodinitrile (2) gives dicyanomethylene-pyrazolin-5-one (4) which immediately reacts with the eliminated anilines by HCN-amine exchange giving the deeply coloured arylamino-cyanomethylene-pyrazolinones (5a-g).Structural investigations and a study of the absorption characteristic are described.

Reactions of 4-(Dicyanomethylene)-3-methyl-1-phenyl-2-pyrazolin-5-one Towards Amines and Phenols

3-Methyl-1-phenyl-2-pyrazoline-4,5-dione (3) condenses readily with malononitrile in refluxing ethanol to yield 4-(dicyanomethylene)-3-methyl-1-phenyl-2-pyrazolin-5-one (4).Compound 4 readily reacts with aliphatic, aromatic, and heterocyclic amines to yie