Abstract
The crystal and molecular structures of N-formyl-C"'a-diethylglycine (1) and N-benzyloxycarbonyl-Cα,α-diethylglycine (2) have been determined by X-ray diffraction techniques. The compounds possess the following parameters: (1) monoclinic, space group C2/c (No. 15), a = 12.062(2) Å, b = 7.675(1) Å, c = 19.609(2) Å, β = 92.0(2)°, and Z = 8; (2) monoclinic, space group P21/n (No. 14), a = 11.111(2) Å, b = 14.189(2) Å, c = 9.425(2) Å, [3 = 97.7(2)°, and Z = 4. The crystal structures were solved by direct methods. The least-squares refinements led to R values of 0.052 and 0.060 for 1595 and 1630 reflections with F ≥ 7 σ(F) for (1) and (2), respectively. The conformation of the Cα,α-diethylglycyl residue is fully extended in the two derivatives. The dispositions of the amide group in (1) and of the urethane moiety in (2) are those commonly observed in analogous compounds.
