Abstract
A number of 2-(substituted phenoxymethyl)phenyl-2-methoxy iminoacetamides were synthesized and their fungicidal activities were examined. The strength of activities and fungicidal spectra varied markedly depending upon the substituents on the benzene ring of the 2-phenoxymethyl group of phenylacetamide moiety. Incorporation of either one or two substituent(s) at 2-, 3-, 4- and/or 5-positions on the benzene ring resulted in an increase of fungicidal activity compared to the unsubstituted compound. However, introduction of a bulky substituent at the 2-position or simultaneous substitution at 2- and 6-positions resulted in decrease of activity. When 2- and 4-, or 2- and 5-positions of the benzene ring were substituted with chlorine and/or methyl groups, in addition to the 2, 5-difluoro derivative (30), the activities were excellent against wheat powdery mildew, cucumber powdery mildew, cucumber gray mold and cucumber downy mildew. Between the two geometrical isomers, the E-form was much stronger than the Z-form.
