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KMID : 0903519870300030227
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Journal of the Korean Society of Agricultural Chemistry and Biotechnology
1987 Volume.30 No. 3 p.227 ~ p.233
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Synthesis of 3 -(Benzothiazol - 2 - yl) - 1 - Methyl Urea Derivatives and Their Biological Activities
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박영선/Park, Young Sun
정영호/홍무기/오세문/Jeong, Young Ho/Hong, Moo Ki/Oh, Se Mun
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Abstract
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Some derivatives of 3-(benzothiazol-2-y1)-1-methyl urea were synthesized by reaction of methyl isocyanate with 2-aminobenzothiazole derivatives prepared by thiocyanation of various substituted anilines. The compounds synthesized were identified by IR, NMR and mass spectra as 3-(5-metyl benzothiazol-2-yl)-1-methyl urea, 3-(5, 6-dimethyl benzothiazol-2-yl)-1-methyl urea, 3-(5-ethyl benzothiazol-2-yl)-1-methyl urea, 3-(6-methoxy benzothiazol-2-yl)-1-methyl urea, 5-(6-chloro benzothiazol-2-yl)-1-methyl urea, and 3-(5, 6-dichloro benzothiazol-2-yl)-1-methyl urea. These compounds were subjected to the test for pre-emergence herbicidal activity in the pots with wettable powder formulation. All of these compounds showed pre-emergence herbicidal activity on Che grasses (Digitaria adscendens HENR and Setaria viridis P. BEAUV) and broad-leaf weeds (Portulaca oleraces L. and Chenopodium album L.) at the dosage of 800g a.i. per 10a. Of the 6 compounds, 3-(6-ethyl benzothiazol-2-yl)-1-methy1 urea showed the highest herbicidal effect on both the grasses and broad-leaf weeds. liven at the rate of 50g a.i. per 10a, this compound inhibited the growth of grasses, selectively.
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