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Insecticide bromfenvinphos of 94-96% purity is manufactured in the Institute of Industrial Organic Chemistry. Besides the main component (bromfenvinphos), more than ten impurities are observed. Two new impurities: 2-bromo-1-ethoxy-(2Ј,4Јdichloro)styrene (as a mixture of geometric isomers) and 2,2-dibromo-1-ethoxy-(2Ј,4Ј-dichloro)styrene were identified by means of mass spectrometry (MS) analysis. Both impurities were independently synthesized using 2,4-dichloroacetophenone as the startingdoi:10.1584/jpestics.g09-45 fatcat:gz4mfqyc3bgmxl34xg4xedh2m4