Computed Properties of C4H11ClN2O. The mechanism of aromatic electrophilic substitution of aromatic heterocycles is consistent with that of benzene. Compound: D-Alanine methylamide hydrochloride, is researched, Molecular C4H11ClN2O, CAS is 61302-99-6, about Peptide models for β-turns. A circular dichroism study. Author is Crisma, M.; Fasman, G. D.; Balaram, H.; Balaram, P..
The CD spectra of β-turn model peptides PhCH2O2C-Aib-Pro-Aib-Pro-OMe (I, Aib = NHCMe2CO), Piv-Pro-Aib-NHMe (II, Piv = Me3CCO), Piv-Pro-D-Ala-NHMe (III), and Piv-Pro-Val-NHMe (IV) were examined in methanol, hexafluoroisopropanol, and cyclohexane. Type I and Type II β-turns were observed for I and II, resp., in the solid state, while the Pro-D-Ala sequence adopts a Type II β-turn in a related peptide crystal structure. A class C spectrum was observed for I in various solvents, suggesting a variant of a Type I (III) structure. The Type II β-turn is characterized by a CD spectrum having two pos. CD bands at ∼230 nm and ∼202 nm, a feature observed in III in cyclohexane and methanol and for II in methanol. II exhibits solvent-dependent CD spectra, which may be rationalized by considering Type II, III and V reverse turn structures. IV adopts non-β-turn structures in polar solvents, but exhibits a class B spectrum in cyclohexane suggesting a population of Type I β-turns.
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