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A 1:1 epimeric mixture of 3-[(4-nitro-benzyl-idene)amino]-2( R,S )-(4-nitro-phen-yl)-5( S )-(propan-2-yl)imidazolidin-4-one, C 19 H 19 N 5 O 5 , was isolated from a reaction mixture of 2( S )-amino-3-methyl-1-oxo-butane-hydrazine and 4-nitro-benz-alde-hyde in ethanol. The product was derived from an initial reaction of 2( S )-amino-3-methyl-1-oxo-butane-hydrazine at its hydrazine group to provide a 4-nitro-benzyl-idene derivative, followed by a cyclization reaction with another mol-ecule of 4-nitro-benzaldehyde to form the chiral five-membered imidazolidin-4-one ring. The formation of the five-membered imidazolidin-4-one ring occurred with retention of the configuration at the 5-position, but with racemization at the 2-position. In the crystal, N-H⋯O(nitro) hydrogen bonds, weak C-H⋯O(carbon-yl) and C-H⋯O(nitro) hydrogen bonds, as well as C-H⋯π, N-H⋯π and π-π inter-actions, are present. These combine to generate a three-dimensional array. Hirshfeld surface analysis and PIXEL calculations are also reported.

acta crystallographica. section e, crystallographic communications

Crystal structure, Hirshfeld surface analysis and PIXEL calculations of a 1:1 epimeric mixture of 3-[(4-nitrobenzylidene)amino]-2(<i>R,S</i>)-(4-nitrophenyl)-5(<i>S</i>)-(propan-2-yl)imidazolidin-4-one

Crystal structure, Hirshfeld surface analysis and PIXEL calculations of a 1:1 epimeric mixture of 3-[(4-nitrobenzylidene)amino]-2(R,S)-(4-nitrophenyl)-5(S)-(propan-2-yl)imidazolidin-4-one