Geometry and Conformation of the α-Aminoisobutyric Acid Residue in Simple Derivatives and Dipeptides. Four New X-ray Structural Analyses and a Statistical Analysis from Known Crystal Data
The results of X-ray diffraction analyses on two α-aminoisobutyric acid (Aib) derivatives, methyl α-(acetylamino)isobutanoate (Ac-Aib-OMe, 1) and benzyl α-isobutanoate (Z-Aib-OBzl, 2), and two terminally blocked, Aib-containing d