The Structure of Cyclo‐Di‐β‐Alanyl
White DNJ., Dunitz JD.
AbstractThe crystal structure of cyclo‐di‐β‐alanyl (monoclinic; a = 11.85, b = 5.20, c = 10.66 Å, β = 94.83°; space group C2/c; Z = 4) has been determined by X‐ray analysis, using direct methods, and refined by full‐matrix least‐squares calculations. The two cis‐peptide groups, related by a twofold axis, are almost exactly planar, and the molecule occurs in a “flexible” chair conformation with N‐CH2CH2‐C torsion angle of 27°.