| 摘要 |
NEW MATERIAL:1-[ 4-( 2,4-Dichlorobenzoyl )-1,3-dimethylpyrazol-5-yl-oxycarbonyl]-3-isopropyl-1H-2,1,3-benzothia diazin-4-(3H)-one-2,2-dioxide shown by the formula. USE:A herbicide. PREPARATION:For example, 3-isopropyl-1H-2,1,3-benzothiadiazine-4-(3H)-one-2,2- dioxide is reacted with phosgene or trichloromethyl chloroformate in the presence of a base such as triethylamine, etc. (preferably >= equimolar amount based on raw material), to synthesize carbamoyl chloride firstly. It is then reacted with 1,3-dimethyl-4-(2,4-dichlorobenzoyl)-5-hydroxypyrazole in the presence of a base. |
