| 摘要 |
Compounds of the formula I <IMAGE> (I) wherein R1 represents a phenyl group substituted by one or two members selected from the group consisting of halogen, alkyl having at most 3 carbon atoms, trifluoromethyl, nitro and cyano; and either (I) R2 represents an alkyl group having at most 5 carbon atoms and R3 represents a methyl group or (II) R2 and R3 together represent a tetramethylene or pentamethylene group; WITH THE PROVISO THAT, WHEN R2 and R3 both represent methyl groups or when R2 and R3 together represent a tetramethylene or pentamethylene group, R1 may not represent a 3-chlorophenyl, 4-chlorophenyl, 3,4-dichlorophenyl or 4-fluorophenyl group, possess valuable insecticidal properties.
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