93598-97-1

Upstream product

• 93598-99-3 2-[1-Dimethylamino-meth-(E)-ylidene]-1-(2-hydroxy-5-methyl-phenyl)-butane-1,3-dione 
• 132631-46-0 2,6-Dimethyl-4-oxo-4H-chromene-3-carbaldehyde 
• 16636-64-9 1-(2-hydroxy-5-methylphenyl)butane-1,3-dione 
• 4637-24-5 N,N-dimethyl-formamide dimethyl acetal 

Relevant academic research and scientific papers

Benzopyrans : Part 40 - Alumina mediated transformations of 4-oxo-4H-1- benzopyran-3-carbaldehyde, -3-carboxylic acid and their 2-methylhomologues

In contact with alumina, the title aldehyde 1 (R = H, Me, Cl) gives the chromones 5 and 9,12 whereas the acid 2 affords the chromones 7, 10 and acetophenone 23. Alumina converts the aldehyde 3 to the xanthone 14, and the corresponding acid 4 to the chromone 8 and diketone 24.

Benzopyrans: Part XVI - Reaction of 1-(2-Hydroxyphenyl)butan-1,3-dione with Dimethylformamide Dimethyl Acetal

1-(2-Hydroxyphenyl)butan-1,3-dione (1, X= H and Me) with dimethylformamide dimethyl acetal gives the enaminodiketone (2') in benzene but the xanthone derivative (8) in methanol medium.Refluxing in alcohol converts 2' into 8 whereas acid treatment of 2' produces 3-acetylchromone (5).