Structural analysis of some chlorinated pesticides by nuclear quadrupole resonance spectrometry.

Nuclear Quadrupole Resonance (NQR) spectrometry provides a useful technique for the determination of structure and has been employed to demonstrate the difference in the chemical environment of the (35)Cl atoms in several chlorinated organic compounds commonly used as pesticides. A tentative assignment of signals to specific chlorine atoms has been made, by utilizing spectra-structure correlation charts, in 1,2,3,4,10,10-hexachloro-6,7-epoxy-1,4,4a,5,6,7,8.8a-octahydro-1,4-endo,endo-5,8-dimethanonaphthalene (Endrin) and in two isomers of 6,7,8,9,10,10-hexachloro-1,5,5a,6,9,9a-hexahydro-6,9-methano-2,4,3-benzodioxathiepin-3-oxide (Endosulfan alpha and beta).