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| DDT is a mixture of three forms of the chemical, one of which has enantiomers--not due to the presence of an asymmetric carbon but the relative position of the chlorine atoms on each of the molecule's two benzene rings. As a conceptual aid, we depicted these substitution patterns using a "square" (2,3,4,6-tetrachloro) and a "triangle" (2,4,5-trichloro) benzene ring (Figure 3). Although the benzene ring was maintained as a rigid body, the three isopropyl groups and the sulfonamide group were allowed to rotate freely and independently within the molecule as shown in Scheme 1. |
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