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An unprecedented chemical transformation of 2-(2',6'-dimethylphenylazo)-4-methylphenol has been observed upon its reaction with [M(PPh(3))(3)X(2)] (M = Ru, Os; X = Cl, Br) whereby one methyl group from the phenyl ring of the arylazo fragment migrates to the metal center via oxidation to CO.
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Acharyya et al. (2003) studied this question.
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