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ring
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ring

Circlet, usually of precious metal, sometimes set with gems, worn on a finger as a decoration or token. The origin of the wedding ring is uncertain, but betrothal rings were bestowed in Roman times. Rings were used for money in ancient Egypt and elsewhere. Their connection with the church still survives in instances such as the English coronation.


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? Mentioned in ? References in periodicals archive
 
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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