Polychlorinated biphenyls isomerization

The second structural property described by the 4ypc index is the substitution pattern on the benzene ring. The value of the 4ypc index increases sharply with the degree of substitution, while in the isomeric classes of substituted benzenes it increases with the proximity of substituents. Thus, this structural parameter has also been found to be very useful in describing activities and properties of polysubstituted benzenes [103], chlorinated benzenes [279], and polychlorinated biphenyls [286]. 

Field Measured Bioaccumulation Factors for Isomeric Groups of Polychlorinated Biphenyls... 

Table 25.2. Polychlorinated biphenyls (PCBs) isomeric group, PCB number, stmcture, and octanol-water partition coefficients (log ow)- ...

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