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Reflections on a killer.

It should be noted that DDT was a poor example to use as an enantiomeric insecticide ("Reflections on Insecticides: Mirror forms of agrochemicals set risk," SN: 1/8/05, p. 20), since this chemical doesn't have an asymmetric carbon and therefore can't exist in "mirror forms."

GORDON W. GRIBBLE, HANOVER, N.H.

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.
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Author:Goho A.
Publication:Science News
Article Type:Letter to the Editor
Date:Feb 26, 2005
Words:91
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