| 摘要 |
Novel ureas and thioureas of the formula WHERE X is oxygen or sulfur, R1 and R2 are alkyl radicals of not more than four carbon atoms, R3 is alkyl of not more than 12 carbon atoms, alkenyl of not more than 12 carbon atoms, cycloalkenyl of six through eight carbon atoms, haloalkyl of not more than 12 carbon atoms and with not more than three halogen atoms therein on the one and two carbon atoms, halophenyl of not more than five halogen atoms, haloalkylphenyl of not more than three haloalkyls having not more than four carbon atoms and not more than three halogen atoms therein, with the provision that the double bond in said alkenyl and cycloalkenyl are not in the 1-position.
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