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- W2000999716 abstract "The oxidation of L-adrenaline (epinephrine) in the presence of [Fe(tetpy)(OH)2]+ ions bound to poly(L-glutamate) or to poly(D-glutamate) has been studied at pH 7 (tetpy = 2,2′:6′,2″:6″,2‴-tetrapyridyl). Electron transfer from the substrate to the central metal ion, which is rate-determining, proceeds stereoselectively only when extensive and possibly specific interactions between adrenaline and the peptidic residues of the ordered polymer in the close environment of the active sites occur. This ensures different steric constraints for the two diastereomeric precursor complexes, which are thought to affect the separation and orientation of the redox centers differently, leading to the observed phenomena. Some data on the catalytic oxidation of L-dopa(3,4-dihydroxyphenylalanine) are also presented, showing stereoselective effects similar to those observed with L-adrenaline, despite the diverse distance of the chiral center from the reacting OH groups. A mechanistic interpretation of the results is discussed in the light of a few general considerations concerning the structural features of the catalytic systems. Possible explanations for the finding that stereoselectivity occurs at the expense of the efficiency of catalysis are also considered." @default.
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- W2000999716 date "1984-08-01" @default.
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- W2000999716 title "Polypeptide matrices as active catalytic supports for stereoselective electron-transfer reactions" @default.
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- W2000999716 doi "https://doi.org/10.1002/bip.360230804" @default.
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