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The crystal and molecular structures of 4,4-diethyl-oxazolidine-2,5-dione (1) and 3-(2'-nitrophenylsulfenyl)-4,4-di- n -propyl-oxazolidine-2,5-dione (2) have been determined by X-ray diffraction. The compounds possess the following parameters: (1) monoclinic, space group  P 2 1 / n  (No. 14),  a  = 8.931(1) Å,  b  = 11.749(2) Å,  c  = 7.867(1) Å,  β  = 98.0(2)°, and  Z  = 4; (2) triclinic, space group  P [unk] (No. 2),  a  = 12.187(2) Å,  b  = 9.588(1) Å,  c  = 7.681(1) Å,  α  = 72.9(2)°,  β  = 73.0(2)°,  γ  = 84.9(2)°,  Z  = 2. The crystal structures were solved by direct methods. The least-squares refinements led to  R  values of 0.040 and 0.039 for 1144 and 2068 reflections with  F ≥7 σ ( F ) for (1) and (2), respectively. The molecules of (1) are linked by intermolecular N1–H1… O2 = C2 hydrogen bonds along the  y  direction. The difference observed between the C1–O1 and C2–O1 distances within the heterocyclic moiety of (1) is not found in (2).

Crystal and molecular structures of two N-carboxy anhydrides of C α , α -disubstituted glycines*