A procedure was developed for preparing a new type of halonitroethenes, 1,2
-dibromo-1-nitro-2-phenyl- and -2-(p-chlorophenyl)ethenes; the energies and
geometries of their molecules were calculated. The bond lengths, bond angl
es, and torsion angles in the former molecule were determined by single cry
stal X-ray diffraction. The molecule has the E configuration; the benzene r
ing is turned relative to the plane formed by the double bond and the bromi
ne atoms and randomly occupies two preferable positions.