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• W1550348533 abstract "Stereoselectively beta-deuterated species were synthesized of Ac-His-NHMe, Ac-His-OEt, Ac-His-OH and H-His-NHMe, which are useful as models of histidine residues in peptides. From the spectral comparison of 1H n.m.r., the beta-proton resonances of the normal species were unambiguously assigned. In (C2H3)2SO, C2(2)H5O2H, C2H3O2H, and C5(2)H5N solution and in aqueous solution, the lower-field and higher-field components of beta-proton resonances of the four histidine derivatives are assigned to the pro-R and pro-S protons, respectively. The alternative assignments apply for Ac-His-NHMe, Ac-His-OEt and Ac-His-OH in non-polar solvents such as C2HCl3. Vicinal coupling constants 3J alpha beta S and 3J alpha beta R were obtained for calculating the fractional populations of rotamers about the C alpha-C beta bond. The rotamer populations depend little on the ionization states of the alpha-amino and carboxyl groups or the imidazole ring. The rotamer populations depend significantly on the solvent polarity, similar to those of Phe, Tyr and Trp derivatives. For the two beta-proton resonances of His, Phe, Tyr, and Trp derivatives in a variety of solvents, linear relationships are found between the differences in chemical shifts and the differences in vicinal coupling constants." @default.
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• W1550348533 date "2009-01-12" @default.
• W1550348533 modified "2023-10-17" @default.
• W1550348533 title "Nuclear magnetic resonance analyses of side chain conformations of histidine and aromatic amino acid derivatives" @default.
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• W1550348533 doi "https://doi.org/10.1111/j.1399-3011.1984.tb00925.x" @default.
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