Synthesis of 9,10-Phenanthrenequinones by Photocyclization of Derivatives of Benzoins: Scope and Limitation of the Methodology

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• The yield of benzoin was 83%, 4,4′-dimethoxibenzoin was 75%, 4,4′-dichlorobenzoin was 67%, 4,4′-dimethylbenzoin was 61%, and 4-methoxy benzoin was 25%.
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• This signal disappeared upon addition of D2O.
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• No ketal was obtained.
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• The same melting point and infrared spectra.
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