Oxidative deprotonation of [M(P)(NH2But)2][M = Ru, Os; P= porphyrin dianion] gives [Ru(P)(O)(NBut)], [Os(P)(O)(NBut)]and [OS(P)(NBut)2], which are characterised by IR and 1H NMR spectroscopy.
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Huang et al. (1992) studied this question.
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