28742-37-2

Basic information

• Product Name: C₄₆H₃₀O₂
• CAS NO: 28742-37-2
• Molecular Weight: 614.743
• Mol File: 28742-37-2.mol

Chemical Properties

• CAS DataBase Reference: C₄₆H₃₀O₂(CAS DataBase Reference)
• NIST Chemistry Reference: C₄₆H₃₀O₂(28742-37-2)
• EPA Substance Registry System: C₄₆H₃₀O₂(28742-37-2)

Safety Data

• Hazardous Substances Data: 28742-37-2(Hazardous Substances Data)

Upstream product

• 28742-18-9 4-hydroxy-2,3,4-triphenylcyclopent-2-ene-1-one 
• 32561-50-5 3,4,5,3',4',5'-Hexaphenyl-bicyclopentyl-3,5,3',5'-tetraene-2,2'-dione 

Downstream Products

• 32561-54-9 C₄₉H₃₈O₂Si 

Relevant articles and documents

Protonation of Tetraphenyl- and 2,3,4-Triphenylcyclopentadienone – An NMR and X-ray Crystallographic Study

The protonation of 2,3,4,5-tetraphenylcyclopentadienone (tetracyclone) yields 6,11-diphenyl-5H-benzo[a]fluoren-5-one (17) and 2,3,4,5-tetraphenylcyclopent-2-en-1-one (18) as the major products. This contrasts with the pyrolysis of tetracyclone, which yields 5,6-diphenyl-11H-benzo[a]fluoren-11-one (22), a structural isomer of 17. Mechanisms are presented that rationalize these observations. The protonation of 4-hydroxy-2,3,4-triphenylcyclopent-2-en-1-none, the precursor to 2,3,4-triphenylcyclopentadienone, generates 2-(2′-oxo-3′,4′,5′-triphenylcyclopent-3′-enyl)-3,4,5-triphenylcyclopenta-2,4-dienone (30), which has been unequivocally characterized by X-ray crystallography. The establishment of the conformation of molecule 30 in the solid state, which correlates with the conformation in solution, provides a rationale for the subsequent formation of the tetrahydro-pentaphenyl-as-indacene-3,4-dione (32) upon further protonation.