Abstract Photooxygenation of 1, 1, 3, 3-tetramethyl-2-indanone triphenyl-phosphazine afforded, in addition to the parent indanone and triphenylphosphine oxide, 2, 2, 5, 5- tetramethyl-3, 4-benzo-3-penten-5-olide from a carbonyl oxide intermediate and also gave light emission.
