| Abstract: | Summary 1. An empirical method for the quantitative determination of the number of NH groups of different types in peptides based on measurements of the integral intensity of the amide A bands in the IR spectra has been developed.2. The IR spectra of the diastereomeric cyclohexaalanyls in CHCl3 solutions have been studied; they indicate the participation of an average of four NH groups in IMBHs.3. On the basis of a theoretical conformational analysis and of dipole-moment measurements, the system of IMHBs and the type of dominant conformation of the cyclohexapeptides in nonpolar solvents have been established.M. M. Shemyakin Institute of the Chemistry of Natural Compounds of the Academy of Sciences of the USSR. Translated from Khimiya Prirodnykh Soedinenii, No. 3, pp. 347–357, May–June, 1971. |
