Most of the compounds have physiologically active properties, and their biological properties are often attributed to the heteroatoms contained in their molecules, and most of these heteroatoms also appear in cyclic structures. A Journal, Comparative Study, Article, Research Support, Non-U.S. Gov’t, International Journal of Peptide & Protein Research called Kinetics of peptide synthesis studied by fluorescence of fluorophenyl esters, Author is Permyakov, Eugene A.; Medvedkin, Vyacheslav N.; Klimenko, Lyubov V.; Mitin, Yuri V.; Permyakov, Serge E. Jr., which mentions a compound: 10466-61-2, SMILESS is N[C@@H](CC(C)C)C(N)=O.[H]Cl, Molecular C6H15ClN2O, Recommanded Product: H-Leu-NH2.HCl.
The kinetics of peptide coupling of protected alanine active esters Boc-Ala-OR [R = 2,3,5-trifluorophenyl (Trf), p-chlorotetrafluorophenyl (Tfc), pentafluorophenyl (Pfp), 2,3,5,6-tetrafluorophenyl (Tfp)] with leucine amide and valine Me ester have been measured using changes in fluorophenyl chromophore emission at 375 nm. The kinetic data cannot be well fit with a simple second-order reaction scheme. Measurements of the reaction kinetics at different concentrations of the reagents showed that the expression for the reaction rate is V = kCN0.5CAE1.5, in which k is the reaction rate constant, CN is the concentration of either H-Leu-NH2 or H-Val-OMe, and CAE is the concentration of the fluorophenyl ester. This reaction equation indicates a complex, probably chain-like, reaction mechanism. The order of reactivity for these active esters with H-Val-OMe is Tfc > Pfp > Tfp > Trf. The apparent rate constant, k, for the reaction with H-Leu-NH2 is higher than that for the reaction with H-Val-OMe.
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