Eur. J. Chem. volume 5, issue 1, P6-10 2014 DOI: 10.5155/eurjchem.5.1.6-10.933
Masaki Ichitani, Soh-ichi Kitoh, Keiko Tanaka, Shuhei Fujinami, Mitsuhiro Suda, Mitsunori Honda, Ko-Ki Kunimoto

KEYWORDSCrystal structures of racemic and enantiomeric 5-isopropyl-5-methylhydantoin (IPrMH) have been determined by single crystal X-ray diffraction. Melting temperatures and solid state infrared spectra are also measured. Racemic IPrMH has a lower melting temperature than the pure enantiomer by 25 °C. The infrared spectrum of racemic IPrMH is identical with that of the pure enantiomer. Nevertheless, the racemic IPrMH doesn't crystallize as a conglomerate but as a racemic compound. The racemic and the enantiomeric crystals are very similar to each other in molecular geometries and intermolecular interactions. In the both cases, the molecules are connected via N−H···O hydrogen bonds to form R 2 2(8) rings, and these rings are linked into infinite one-dimensional tapes. In the racemic crystal, a single tape is composed of single enantiomer and itself is homochiral. Hydantoin Enantiomer Conglomerate Crystal structure Racemic compound Imidazolidine-2,4-dione


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