The title compound, C13H13N2O3, a hydantoin derivative, crystallized with two molecules (A and B) in an asymmetric unit. In molecule A, the imidazolidine ring is twisted about the C-N bond involving the spiro C atom, while in molecule B this ring is flat (r.m.s. deviation = 0.010 Å). The pyran rings in both molecules have distorted half-chair conformations. The mean plane of the imidazolidine ring is inclined to the aromatic ring of the chroman unit by 79.71 (11)° in molecule A and 82.83 (12)° in molecule B. In the crystal, pairs of N-HO hydrogen bonds link the individual molecules to form A-A and B-B inversion dimers. The dimers are linked via N-HO and C-HO hydrogen bonds, forming sheets lying parallel to the bc plane, viz. (011). Within the sheets, the A and B molecules are linked by C-H interactions.
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Crystal_structure_of_1'-ethylspiro[chroman-4,4'-imidazolidine]-2',5'-dione_a_.pdf | 517.92 KB |