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Not the Markovnikov product 4, but the anti-Markovnikov product 3 is obtained by the oxidative amination of styrenes 1 with secondary amines 2. The oxidant in this rhodium-catalyzed reaction is the olefin itself, which is reduced to the ethylarene 5. Ar = aryl, R = alkyl, aryl.
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Beller et al. (1997) studied this question.
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