| 摘要 |
<p>This invention relates to novel esters, useful as insecticides, of formula: < IMG > where R1 and R2 are methyl, halomethyl or halo; X is oxygen, sulphur, sulphonyl or NR4 where R4 is hydrogen, alkyl or carboxylic acyl; R3 is alkyl, alkenyl or benzyl and additionally R3 may be hydrogen when X is NR4; m=0 or 1 and n=1 to 4. The compounds may be prepared by esterification process from the corresponding benzyl alcohols which are also new compounds. e</p> |
