| 摘要 |
<p>The invention is concerned with propionic acid esters of the general formula I wherein R1 represents a hydrogen atom, an alkyl group containing 1-6 carbon atoms or a phenyl group, R2 represents an alkyl group containing 1-6 carbon atoms, an alkenyl group containing 2-6 carbon atoms, an alkynyl group containing 2-6 carbon atoms or a phenyl group or R1 and R2 together with the carbon atom to which they are attached form a cycloalkane ring containing 4-10 carbon atoms which, if desired, can be mono-, dior tri-substituted with alkyl containing 1-3 carbon atoms, R3 represents a halogen atom or a trifluoromethyl or nitro group and R4 and R5 each represent a hydrogen or halogen atom, processes for the manufacture thereof, herbicidal compositions which contain at least one of these compounds as the active substance and the use of said compounds or compositions for the control of weeds.</p> |
