| 摘要 |
An improved process for preparing 3-cyclohexyl-1-methyl-6-dimethylamino-s-triazine-2,4(1H,3H)dione by the following reaction sequence: <IMAGE> (1) <IMAGE> (2) <IMAGE> (3) <IMAGE> <IMAGE> (4) <IMAGE> <IMAGE> (5) <IMAGE> <IMAGE> (6) <IMAGE> the improvement comprising using R=ethyl, n-propyl or isopropyl, preferably ethyl, thus permitting significantly higher practical overall yields. Related 3-substituted-1-methyl-6-substituted amino-s-triazine-2,4(1H,3H)diones and 4-thio-2,4(1H,3H)-diones are prepared similarly. These products are useful as herbicides.
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