| 摘要 |
NEW MATERIAL:A 3-substitued-1,2-benzothiazol-1,1-dioxide of formula I [A is -CHR-CO-(R is H, methyl, phenyl, butyl), -CH=CH-CO-, -CH=N-, -C(CH3)=N-, formula II, formula III]. EXAMPLE:The compound of formula IV. USE:An agent combatting plant diseases caused by fungi, especially showing strong effect against rice blast. PREPARATION:The reaction of 3-halogeno-1,2-benzisothiazole-1,1-dioxide of formula V (X is halogen) with a thione or thiol of formula VI or VII [B is -CHR-CO-, formula II; C is -CH=N-, -C(CH3)=N-, -C(SH)=N-] is carried out in the presence of a dehydrohalogenation agent to give the compound of formula I. |
