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Four fundamental physical parameters of series of benzene derivatives were studied to ascertain correlations with biological activity. These included octanol/water coefficient, vapor pressure, infrared absorption (out-of-plane C-H vibration), and the pi values. Each physicochemical constant exhibited a partial correlation with biological activity suggesting that each played a role. It was presumed that more precise and specific data on the biological activity would have permitted a better correlation. It is postulated that the biological activity of a compound is due to the sum of such physicochemical factors as: partition coefficient, molecular geometry and spatial orientation, electronic characteristics of the molecular orbitals, and vibrational-rotational frequencies of constituent groups.

Chemical structure and properties of selected benzene compounds in relation to biological activity.