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Two novel platinum complexes, [bis(diphenylphosphino)ethane][ N -((1 S,2 R )-2-hydroxo-1,2-diphenylethyl)-4-methyl-benzenesulfonamidato]platinum(II) [(dppe)Pt(MBS−O), 2a] and [bis(diphenylphosphino)ethane][ N -((1 S,2 R )-2-amido-1,2-diphenylethyl)-4-methylbenzenesulfonamidato]platinum [(dppe)Pt(MBS−NH), 2b ] were synthesized and structurally characterized. Experimental results show that compound 2b is an efficient initiator toward ring opening polymerization of amino acid N -carboxyanhydride (NCA) yielding polypeptides with narrow PDIs (1.07−1.19). By comparing the activity of complex 2a with that of 2b, the mechanism for polymerization of NCA initiated by an amido−sulfonamidate is proposed.
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Peng et al. (2008) studied this question.
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