Theoretical UV Circular Dichroism of Cyclo(l-Proline-l-Proline)
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A new method for isolation of hydroxy-L-proline and L-proline from gelatin.
Several investigators have reported that commercial L-proline is contaminated with small amounts of hydroxy-n-proline (l-3). During the course of investigations in this laboratory all of five commercial samples proved to contain up to 3.5 per cent hydroxyproline when tested by the method of Neuman and Logan (1). The preparation of n-proline from gelatin by the formation of complex salts is tedi...
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The asymmetric unit of the title compound, [Hg(4)Cl(8)(C(5)H(9)NO(2))(2)](n), consists of four HgCl(2) units and two L-proline ligands in the zwitterionic form. In each HgCl(2) unit, the Hg(II) ion is strongly bonded to two Cl atoms, and the Hg(II) ions in two of the HgCl(2) units are chelated by O atoms of two l-proline ligands, with one strong and one weak Hg-O bond. In the crystal structure,...
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The direct three component modified Mannich reaction via condensation of aldehydes, 2-naphthol or 2,7-naphthalendiol and piperidine to generate Betti bases has been carried out over L-proline (20 mol%) with high efficiency under solvent free conditions at 70 OC. Also, the reaction of aromatic aldehyde and 4-hydroxycoumarin in the presence of L-proline (20 mol%) in the ethanol under reflux condi...
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A green and efficient one pot, three component protocol for synthesis of naphthopyranopyrimidines by cyclocondensation of β-naphthol, aldehyde, and 6-amino-1,3-dimethyluracil using L-proline as a beneficial catalyst with high catalytic activity under solvent-free conditions at 100 °C is described. In this study, several types of aromatic aldehyde, containing electron-withdrawing groups as well ...
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26 Gerhart, J. C., and A. B. Pardee, in Synthesis and Structure of Macromolecules, Cold Spring Harbor Symposia on Quantitative Biology, vol. 28 (1963), p. 491. 27 Changeux, J. P., in Subunit Structure of Proteins, Brookhaven Symposia in Biology, no. 17 (1964), p. 232. 28 Antonini, E., J. Wyman, M. Brunori, J. F. Taylor, A. Rossi-Fanelli, and A. Caputo, J. Biol. Chem., 239, 907 (1964). 29 Gibson...
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ژورنال
عنوان ژورنال: The Journal of Physical Chemistry A
سال: 2006
ISSN: 1089-5639,1520-5215
DOI: 10.1021/jp061761c