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These materials are used effectively in a number of crops including soybeans and cereal grains, such as wheat and rice, to control grassy weed pests. In contrast to the more traditional herbicides with high dosage rates, these materials are effective at much lower application rates, in the range of tens of grams per acre in some cases. All of these compounds contain a chiral center in the propionic acid portion of the molecule, and this chiral center is important to the observed biological effectiveness.'" Even though some of these materials are sold as racemic mixtures, it is known that only the R enantiomer is active, whereas the S enantiomer is inactive. Thus, being able to make only the desired optical isomer of these materials with high optical purity becomes one of the prime driving forces in the development of viable commercial synthetic routes to these compounds.

Utilization of structure-property relationships as a guide for achievement of high optical purity in aryloxyphenoxypropionates