The crystal and molecular structure of ethyl α-cyano-α-(2, 4- dinitrophenyl) phenylacetate was determined. The data of the crystal and molecular structure were collected at space group P21/c, a=0.8903(1), b=1.2303(1), c=1.5119(3)nm, β=94.23(1)°, V=1.6515nm^3, μ(MoKα)=8.951cm^-^1, Dc=1.429(g/cm^3), Z=4, final R=0.075, Rw=0.069 for 3283 observed unique reflections. By the comparison with ethyl α- cyano-α-(2-nitrophenyl) acetate, it was studied the influence of steric and electronic effects in molecule to the bond parameters and special spectroscopy information. So was that to the bond parameters and ^1H NMR spectroscopy of ethoxy group in molecule.

Key words: BENZENEACETIC ACID P, CRYSTAL STRUCTURE, MOLECULAR STRUCTURE, ETHYL ESTER, NITROBENZENE P, PROTON MAGNETIC RESONANCE SPECTROMETRY, CYANO GROUP, STEREOELECTRONIC EFFECT