106038-24-8

Upstream product

• 135763-12-1 (Triphenyl-λ⁵-phosphanylidene)-acetic acid 6-formyl-5-methoxy-2-methyl-4-oxo-4H-chromen-7-yl ester 
• 7338-51-4 7-hydroxy-5-methoxy-2-methyl-4-oxo-4H-chromene-6-carbaldehyde 
• 73818-55-0 Bestmann ylide 

Relevant academic research and scientific papers

CHEMISTRY OF PHOSPHORUS YLIDES 9. REACTIONS WITH PHOSPHACUMULENES III. SYNTHESIS OF BENZODIPYRANS FROM THE REACTION OF KETENYLIDENE-AND THIOKETENYLIDENETRIPHENYLPHOSPHORANE WITH FORMYL BENZOPYRAN DERIVATIVES

When 6-formyl-7-hydroxy-5-methoxy-2-methylbenzopyran-4-one (1a), was reacted with ketenylidene (2a) and thioketenylidenetriphenylphosphorane (2b), the corresponding 5-methoxy-8-methyl-2,6-dioxo-2H, 6H-benzodipyran (4a) and its thio analogue (4b), were obtained respectively.The structure of the new benzodipyrans (4) were confirmed on the basis of elemental analysis and spectral studies.Moreover, the pyrazole derivatives (5), were obtained when compounds (4) were allowed to react with hydrazine hydrate.