| 摘要 |
The (+), (-) and (+/-) forms of the compounds of formula I <IMAGE> wherein R1 is hydrogen or a methoxy, ethoxy, propoxy, methylthio, ethylthio, propylthio, fluoro, chloro, bromo, methyl, ethyl, nitro or amino group, and R2 is a hydrogen or methyl group or R1 and R2 together form a methylenedioxy group; R3 is hydrogen, or a lower alkyl group, or one of the following groups (a) to (d): (a) m-phenoxybenzyl (b) 2-benzyl-4-furylmethyl (c) alpha -cyano-m-phenoxybenzyl (d) 3,4-methylenedioxy-benzyl, and R4 and R5 are the same or different groups and each is a fluoro, bromo, chloro or methyl group. The compounds of formula I in which R3 is one of group (a) to (d) are extremely active as insecticides (except when R1 is an amino group). The compounds also possess the property of contact repellency to insects.
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