COMMUNICATIONS TO THE EDITOR Conformations of Protected Oligo(y -methyl-L-glutamates) at the Air-Water Interface ## Synopsis In a previous paper dealing with the synthesis and the conformational behavior of a series of oligo(y-methyl-L-glutamates), it was shown that an organized conformation app
Synthesis of protected oligo (γ-methyl-L-glutamates) and study of their conformation in solution and at the air–water interface
✍ Scribed by J. Caspers; W. Hecq; A. Loffet
- Publisher
- Wiley (John Wiley & Sons)
- Year
- 1975
- Tongue
- English
- Weight
- 685 KB
- Volume
- 14
- Category
- Article
- ISSN
- 0006-3525
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✦ Synopsis
Abstract
Oligopeptides having the general formula N‐carbobenzoxy(γ‐methyl‐L‐glutamyl)~n~‐dimethyl‐L‐glutamate (with n = 1, 3, 5, 7, 11) were prepared, using both solid‐phase synthesis and conventional peptide couplings in solution. The appearance of an ordered structure with increasing chain length was studied in organic solvents and at the air–water interface. The results obtained by thin‐layer chromatography were interpreted. All the studies have demonstrated a very similar behaviour of this type of oligopeptide in solution and in monolayers.
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The proton magnetic resonance spectra of enitrophenylthio-tetra-and hexa-y-benzyl-L-glutamate ethylamides have been measured at different concentrations in CDC1, and CD,,Cl. The N H and a-CH resonances of the tetrapeptide show downfield shifts with increasing concentration, accompanying disappearanc