| abstract |
There are disclosed compounds of the general formula I <IMAGE> wherein: X is oxygen or sulfur, R is an alkyl of up to four carbon atoms, an alkenyl of up to three carbon atoms, an alkynyl of up to three carbon atoms, or a chloromethyl, bromomethyl, 2-chloroethyl, and 2-bromoethyl, and R' is an alkyl of up to four carbon atoms, which are used in weed control. |