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A convenient synthesis of three cyclopenta[ad]pyrene derivatives methylated on the five‐membered ring is described. The starting materials were easily available ketones which were either Wolff‐Kishner‐reduced or treated with methyllithium followed by dehydration with p‐toluene‐sulfonic acid to give the partially saturated derivatives. Careful aromatization with DDQ gave the novel methylated compounds in reasonable yields.
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Kellenbach et al. (1989) studied this question.
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