| 摘要 |
Insecticides of the formula <IMAGE> wherein R1 and R2 are each selected from methyl, halomethyl, and halo; X is oxygen, sulphur, sulphonyl or a group NR4 where R4 represents hydrogen, lower alkyl or lower carboxylic acyl; R3 is lower alkyl, lower alkenyl or benzyl; m has the value zero or one, and n has a value from one to four. |
