21128-04-1

Basic information

• Product Name: 5,8-diketo-7-methoxy-4-phenylcoumarin
• CAS NO: 21128-04-1
• Molecular Weight: 282.252
• Mol File: 21128-04-1.mol
• Article Data: 1

Chemical Properties

• CAS DataBase Reference: 5,8-diketo-7-methoxy-4-phenylcoumarin(CAS DataBase Reference)
• NIST Chemistry Reference: 5,8-diketo-7-methoxy-4-phenylcoumarin(21128-04-1)
• EPA Substance Registry System: 5,8-diketo-7-methoxy-4-phenylcoumarin(21128-04-1)

Safety Data

• Hazardous Substances Data: 21128-04-1(Hazardous Substances Data)

Upstream product

• 934-00-9 3-methocycatechol 
• 94-02-0 ethyl 3-oxo-3-phenylpropionate 
• 482-83-7 6-Hydroxy-7-methoxy-4-phenyl-coumarin 
• 24258-36-4 8-hydroxy-7-methoxy-4-phenyl-2H-chromen-2-one 

Relevant articles and documents

Structural modifications of dalbergin using benzeneseleninic anhydride

Reaction of dalbergin (6-hydroxy-7-methoxy-4-phenylcoumarin) (1) with benzeneseleninic anhydride afforded two quinones, the major being an o-quinone (2) arising from oxidation of ring A of the chromanone moiety and the minor (3) resulting from a rearrangement of (2). The p-quinone (3) was isolated independently from benzeneseleninic acid oxidation of 8-hydroxy-7-methoxy-4-phenylcoumarin (7). The benzopyran-2-ones (8) and (9) when reacted with benzeneseleninic anhydride yielded the o-quinones (10, 11) only. Confirmation of the o-quinone structure (2) was obtained by single crystal X-ray analysis. The structures and chemistry of the compounds are discussed. The o-quinones displayed significant fungicidal properties.