| abstract |
Herbicidal agents, containing as active ingredient a compound of the formula <IMAGE> or their salts with acids, are useful for combatting a great variety of mono- and dicotyledonous weeds. In the formula R1 is methyl or halomethyl, R2 is OH, SH, OM or SM (M=equivalent of a base), R3 is the same as R2 or an ester, amide or hydrazide group, R4 and R5 are preferably hydrogen and X is oxygen or sulfur. |