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Condensation of cyclohexane‐1,3‐dione or dimedone with o‐nitrobenzaldehyde and ammonium acetate/acetic anhydride furnished the corresponding acridinedione/xanthene derivatives. The middle ring aromatization followed by reductive cyclization afforded the respective condensed acridine systems.
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Murugan et al. (2005) studied this question.
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