Crystal structure of 1-methyl-5-phenylhydantoin

The title compound (C10H10N2O2, M-r=190.20), 1-methyl-5-phenyl-hydantoin (1-methyl-5-phenyl-2, 4-imidazolidinedione) was synthesized by the reaction of 2-hydroxy-2-methylthio acetophenone (alpha-benzoyl hemithioacetal) with methylurea in slightly acidic medium. The crystal was crystallized in the orthorhombic system, space group Pbca with parameters a=18.077(5), b=14.386(2), c=7.035(1) Angstrom, Z=8, V=1829(1) Angstrom(3), D-c=1.381 g/cm(3), mu(MoK alpha)=0.99cm(-1), F (000)=800, R=0.040, R-w=0.050 for 1395 observed reflections [I>3 sigma(1)]. It consists of a planar benzene ring and an imidazole ring, whose dihedral angle is 96.32 degrees. In the title crystal, the glide-c-related-molecules (x, 1/2-y, -1/2+z) form chains, which are further related by the screw axis (1-x, 1/2+y, 1/2-z), forming networks along the be plane. The networks are centrosymmetrically packed (1-x, -y, -z).