3, 5-Dihydro-3, 5-dialkyl-3, 5-diaryl-4 H-pyrazol-4-ones stimulate interest as potential precursors for 2, 3-diarylcyclopropanones. Photoreactions of trans-3, 5-dihydro-3, 5-dimethyl- 3, 5-diphenyl-4 H-pyrazol-4-one were studied by continuous-wave (CW) and pulsed laser UV photolysis revealing an intermediate that undergoes rearrangement to form cis-and trans- 1, 3-dimethyl-1-phenyl-2-indanones with the yield of ca. 60%. Steady-state photolysis ( ...
