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|Title:||Benzopyrans : Part 40† - Alumina mediated transformations of 4-oxo-4H-1-benzopyran-3-carbaldehyde, -3-carboxylic acid and their 2-methylhomologues|
|Authors:||Ghosh, Chandra Kanta|
|Abstract:||In contact with alumina, the titlte aldehyde 1 (R = H, Me, CI) 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.|
|Appears in Collections:||IJC-B Vol.38B(02) [February 1999]|
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