| 摘要 |
The title compds. (I; R1 and R2 are H or alkyl; R3 = H, alkyl, alkylammonium), useful as herbicides, were prepd. by reaction of compd, II(n = 0-2) and phosgen or amine(III) in solvent in the presence of acid binding agent. Thus, 15.4g [5-(1,3-dimethylureido)-1, 3, 4-thiadiazil-2-ylsulfonyl aceticacid methyl ester was suspended in a soln. of 2g sodium hydroxide and 100ml H2O, and reacted for 30min. Obtained product was treated with conc. HCl to give 14.6g [5-(1,3-dimethylureido-1, 3-4-thiadiazol-2-ylsulfonyl acetic acid.
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