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The reaction of ‘(C5Me5)Ru+’, produced by the protonation of [(C5Me5)RuOMe]2 by CF3SO3H, with various steroids leads to selective aromatization of the A ring via demethylation of the 19 methyl group and/or dehydration and/or dehydrogenation reactions.
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Urbanos et al. (1991) studied this question.
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