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Products have been isolated and identified from two photochemical reactions of 9,9′‐bifluorenylidene (I). The photo‐oxidation of I yields 9‐fluorenone, the cyclodehydrogenation fluoreno(1,9a,9‐a,b)fluoranthene together with the reduced form of I, 9,9′‐bifluorene.
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G. P. DE GUNST (1969) studied this question.
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