| 摘要 |
NEW MATERIAL:An N-(tetrahydrobenzothiazolylcarbamoyl) oxamic acid salt derivative expressed by formula I (R1 is 1-6C straight chain, branched, cyclic alkyl or phenyl; R2 is H or methyl; M is alkali metal or alkaline earth metal cation; n is 1 when M is an alkali metal and 1/2 when M is an alkaline earth metal; M' is H or M). EXAMPLE:Potassium N-[(5,5-dimethyl-4,5,6,7-tetrahydro-7-oxo-2-benzothiazolyl) carbamoyl]-N-methyloxamate. USE:A herbicide effective against gramineous and broad-leaved weeds, etc. PREPARATION:For example, a tetrahydrobenzothiazolylimidazolidinetrione expressed by formula II is reacted with an alkali metal hydroxide or alkaline earth metal hydroxide to afford the aimed compound expressed by formula I .
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