Photochemistry. VII. Photolyses of Polyphenylpyridazine N-Oxides

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3, 4, 5, 6-Tetraphenylpyridazine 1-oxide (II) was irradiated in acetone or dichloromethane with high pressure mercury lamp (200W) for 3 hr, affording tetraphenylfuran (III), dibenzoylstilbenes (IV and V), 1-(1, 2, 3-triphenylcyclopropeny1)-Δ3, 6-bicyclo [3, 2, 0]-heptadien-2-one (VI), and the deoxygenated starting material (I). 3, 4, 6-Triphenylpyridazine 1-oxide (VIII) gave triphenylfuran (IX), cis-dibenzoylstyrene (X), 3-benzoyl-1, 2-diphenyl-1-cyclopropene (XI), and the deoxygenated starting material (VII). The reaction mechanism is also discussed

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