Abstract: Nineteen new 2-oxo-3,3-dimethylbutyl α-aryloxypropionate derivatives have been prepared by reaction of α-aryloxypropionic acid with α-bromopinacolone using triethylamine as an acid acceptor.The synthetic methods for the compounds III have been discussed.Their chemical structures were confirmed by IR,1H NMR and elemental analysis.The primary biological tests showed that some of them have higher herbicidal activities on Amaranthus retroflexus,Brassica campestris and Medicago saliva(inhibition rate 100 % under the dosage of 0.225 g/m2).