67140-88-9

Upstream product

• 941-69-5 N-phenyl-maleimide 

Downstream Products

• 51751-37-2 2-Methyl-4-oxo-4H-<1>benzopyran-3-carboxylic acid 
• 107089-92-9 2-Methyl-4-(phenyl-hydrazono)-4H-chromene-3-carbonitrile 
• 114954-02-8 1-phenyl-3-methyl-4-cyano-5-(2-hydroxyphenyl)pyrazole 
• 114954-03-9 5-(2-Hydroxy-phenyl)-3-methyl-1-m-tolyl-1H-pyrazole-4-carbonitrile 
• 51138-45-5 1-phenyl-3-methyl-5-(2'-hydroxyphenyl)pyrazole 
• 107089-95-2 2-phenyl-4-methyl<1>benzopyrano<4,3-c>pyrazol-3(2H)-one 
• 107089-93-0 Acetic acid N'-[3-cyano-2-methyl-chromen-(4E)-ylidene]-N-phenyl-hydrazide 
• 124557-93-3 2-Amino-3-(2-phenyl-2H-pyrazol-3-yl)-chromen-4-one 
• 110570-19-9 3-methyl-1-(3-methylphenyl)chromeno[4,3-c]pyrazol-4(1H)-one 
• 2764-19-4 3-methyl-1-phenyl-1H,4H-chromeno[4,3-c]pyrazol-4-(1H)one 
• 1354217-25-6 C₂₉H₁₆N₂O₆ 

Relevant academic research and scientific papers

Benzopyrans - XXXIII. Cycloaddition of N,N-Dimethylhydrazones and Anils of 2-Unsubstituted and 2-Methyl-4-oxo-4H-1-benzopyran-3-carboxaldehyde with N-Phenylmaleimide

The chromone derivatives 1, 2, and 4 give with N-phenylmaleimide the cycloadducts 5, 12, and 13 which are converted by palladised charcoal into 2-azaxanthone 6, xanthones 14 and 15, respectively.Treatment of the azaxanthone 5 with acidic ethanol produces a mixture of salicyloyl-pyridines 7-9.