| 摘要 |
Compounds having the formula <IMAGE> in which: R is hydrogen, 2-halo, 2-(C1-C4 alkyl), 2-trifluoromethyl, 2-nitro, 2-(C1-C4 alkoxy), 4-halo, 2-halo-6-butynyloxy, or 2,6-dihalo; R1 is halo, C1-C4 alkyl, trifluoromethyl or cyano, and if R is 2-halo, 2-methyl, 2-nitro, 2-methoxy, 2-trifluoromethyl or 2,6-dihalo then R1 may also be hydrogen; R2, R3, R4 and R5 are independently hydrogen or methyl or R3 and R4 taken together form a bond; and X is O or S; provided that: a) if R1 is bromo, R is not 2,6-difluoro; and b) if R1 is chloro, R is not 2,6-dichloro.
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