7433-92-3

Basic information

• Product Name: [2]Benzopyrano[4,3-c][2]benzopyran-6,12-dione
• Synonyms: [2]Benzopyrano[4,3-c][2]benzopyran-6,12-dione
• CAS NO: 7433-92-3
• Molecular Formula: C₁₆H₈O₄
• Molecular Weight: 0
• Mol File: 7433-92-3.mol
• Article Data: 3

Chemical Properties

• Appearance: /
• CAS DataBase Reference: [2]Benzopyrano[4,3-c][2]benzopyran-6,12-dione(CAS DataBase Reference)
• NIST Chemistry Reference: [2]Benzopyrano[4,3-c][2]benzopyran-6,12-dione(7433-92-3)
• EPA Substance Registry System: [2]Benzopyrano[4,3-c][2]benzopyran-6,12-dione(7433-92-3)

Safety Data

• Hazardous Substances Data: 7433-92-3(Hazardous Substances Data)

Upstream product

• 85-44-9 phthalic anhydride 
• 4122-56-9 methyl o-formylbenzoate 
• 601-70-7 3,3-dichlorophthalide 
• 938-24-9 indantrione 
• 6630-33-7 ortho-bromobenzaldehyde 
• 201230-82-2 carbon monoxide 
• 61592-98-1 1,2-bis(2-bromophenyl)-2-hydroxyethan-1-one 

Downstream Products

• 645-49-8 cis-stilben 
• 78229-60-4 4b,10b-Dihydro-13-syn,14-anti-diphenyl-4b,10b-ethano<2>benzopyrano<4,3-c><2>benzopyran-6,12-dion 

Relevant articles and documents

Palladium-Catalyzed Double Carbonylative Cyclization of Benzoins: Synthesis and Photoluminescence of Bis-Ester-Bridged Stilbenes

A palladium-catalyzed double carbonylative cyclization of benzoins has been developed, which realizes the synthesis of bis-ester-bridged stilbenes just in two steps from aldehydes. Thus, the obtained fully fused tetracyclic π-systems have a pyrano[3,2-b]pyran-2,6-dione (PPD) core on their center, showing two reversible reductions at low potentials. In addition, their photoluminescence properties are strikingly affected by the aromatic rings fused to the PPD core; bis-thieno-fused PPDs are found to be excellent fluorophores with quantum yields up to 0.98.

ELECTROCHEMICAL REDUCTION OF PHTHALYL CHLORIDE. A NEW ROUTE FOR THE SYNTHESIS OF 3-SUBSTITUTED PHTHALIDES

The cathodic reduction, under various conditions, of phthalyl chloride enables efficient synthesis of (E)-biisobenzofuranyliden-3,3'-dion(4), (2)-benzopyrano - benzopyrano-6,12-dione (7), 3-chlorophtalide (8), phtalide (9), or (E)-3 phtalide (12); the structure of the latter compound was confirmed by X-ray crystallography.