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By means of the chiral auxiliaries 1-m- and 1-p-pyridylethanols 2, racemic α-arylcarboxylic acids (as anhydrides 1) can be resolved into their enantiomers. One enantiomer accumulates in the ester 3 and the other in the acid 4. Interesting examples are 2-aryl-3-methylbutyric acids (pyrethroid acids).