Abstract
Abstract The crystal and molecular structure of the title compound has been determined by x-ray analysis from diffractometer data. Crystals are monoclinic, space group P21a with a=12.094(2), b=15.441(3), c=7.545(1) Å, β=95.04(1)°, and Z=4. The structure was solved by the heavy-atom method, and refined by full matrix least-squares to R=0.073 for 3254 reflections. The examined compound is a highly effective insecticide of relatively low mammalian toxicity. X-ray and nmr studies show the H atom to be in trans position in relation to the phosphoryl group. Although least-squares planes of the benzene ring and the ethylene system are considerably twisted (65°), C(2)–C(5) bond length (1.47Å) indicates the conjugation of both unsaturated systems. The molecules are well separated, there is only one contact Br(1)… Cl(1) (3.56 Å) less than the sum of the van der Waals radii (3.75 Å).
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