Tetrachlorobiphenyls, structure

Several stndies have related the structures of PCBs to their rates of elimination by mammals. In one stndy (Mizutani et al. 1977), the elimination of tetrachlorobiphenyl... 

Automation has truly revolutionized analysis, but the contribution of the skilled analyst has increased rather than diminished. The occurrence of extraneous peaks in chromatograms due to unexpected compounds should not be merely accepted blindly but their structures should be verified. A good example is the occurrence in sediment samples of a compound which had the same GC retention time as PCB 77 (3,3, 4,4 -tetrachlorobiphenyl) but which on... 

Not all chlorines in PCB structures are equally reactive. Ortho-chlorines are removed preferentially to those in meta- and para-positions (21,23). Thus, 2,2, 4,4 -tetrachlorobiphenyl yields sequentially... 

Bastiansen O (1949) The moteodar structure of biphenyl and some of its derivatives. Act. Chem. Scand. 3 408 See also Bastiansen O, Traetteberg M Tetrahedron 17 147 (1962) d Atmibale A, Lunazzi L, Boicelli AC, Macciantelli D (1973) The conformational problem of biphenyl in solution as investigated by the liquid crystal magnetic resonance spectrum of 3,3, 5,5 -tetrachlorobiphenyl. J. Chem. Soc. Perkins II 1396 see also Schmid ED, Brosa BJ (1972) Chem. Phys., 56 6267... 

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