Nitrobenzene (98-95-3) 's Synthetic route

Photochemistry of Benzene Isomers. 1. Fulvene and 3,4-Dimethylenecyclobutene

Kent, Jay E.  Harman, Peter J.  O'Dwyer, Michael F.

The photochemical behavior of the benzene isomer fulvene is investigated at various excitation wavelengths.The only observable photoproduct is benzene, produced in high quantum yield below about 275-nm excitation.The quantum yield is dependent upon excitation wavelength indicating the photoisomerization requires vibrational activation.Quenching by various added gases is efficient and suggests that the photochemistry does not invove triplet-state or free-radical mechanisms.Another isomer, 3,4-dimethylenecyclobutene, also shows photochemical behavior upon excitation at 240 and 215 nm to produce a polymeric material.