β‐carbonylamides in peptide chemistry. II. Ultraviolet absorption and circular dichroic properties of azlactones derived from N‐acetoacetyl amino acids

Abstract

SynopsisUltraviolel absorphn and circular dichroism spect,ra of azlact,ories derived from N-acetoacetyl amino acids are examined. A number of model compounds of the isomeric forms possibly present in the equilibrium mixtures of these azlactones have also been prepared and their spectral properties compared. The reported data permit structural and stereochemical assignments on these amide compounds. Q 1971 by John Wiley & Sons, Inc. A , , m M [elmax x 1w3 XWx, ml.c [elmnx X AcA-L-Ala 285 +10,3