1.4- Diphenylphthalazine 2-oxide photolysis

Photolysis of 1,4-diphenylphthalazine 2-oxide in various solvents gives 1,3-diphenyl-isobenzofuran (52) as the primary product. In the presence of oxygen, deoxygenation to 1,4-diphenylphthalazine and oxidation of the initially formed 1,3-diphenylisobenzofuran (52) to 1,2-dibenzoylbenzene also take place (Scheme 17). 

Photolysis of 1,4-diphenylphthalazine 2-oxide (200) in acetone yields 1,3-diphenylisobenzofuran (201), and this is interpreted as arising by loss of nitrogen from the intermediate oxaziridine (202).170... 

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See also in sourсe #XX -- [ ]

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