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- W2055608794 abstract "Polymerizations of L- and DL-phenylalanine N-carboxyanhydride in nitrobenzene by poly (N-methyl-L-alanine) of varying degrees of polymerization (n = 1–30) were investigated. Poly(N-methyl-L-alanine) was prepared by the polymerization of N-methyl-L-alanine NCA with N-methyl-L-alanine diethylamide and the degree of polymerization was controlled by the molar ratio [NCA]/[Catalyst] + 1. This polymer was shown to be an asymmetrically selective catalyst which polymerized L-phenylalanine NCA at a faster rate than DL-phenylalanine NCA. With increasing degree of polymerization the stability of the secondary structure of poly(N-methyl-L-alanine) increased. This was confirmed by circular dichroism spectra. However, the degree of asymmetric selection did not increase as the stability of the secondary structure of poly(N-methyl-L-alanine) increased. These findings indicate that the interaction of a growing polypeptide in an ordered structure with NCA molecules prior to the reaction does not lead to an asymmetric selection, and that the mechanism of the asymmetric selection by poly(N-methyl-L-alanine) should be different from those proposed so far." @default.
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- W2055608794 date "1973-12-01" @default.
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- W2055608794 title "Polymerization ofL- andDL-phenylalanineN-carboxyanhydride by poly(N-methyl-L-alanine)" @default.
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- W2055608794 doi "https://doi.org/10.1002/bip.1973.360121202" @default.
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