The treatment of 4-nitroimidazoles with an excess of sodium borohydrid
e in the presence of sodium methoxide yields the (Z)-oximes of 4-imida
zolidinones. The title compound, 1-phenyl-4-imidazolidinone (Z)-oxime,
C9H11N3O, is a coplanar molecule despite the saturation of the hetero
ring.