New diphenyl ethers having herbicidal activity.

摘要

The invention relates to new diphenyl ethers of the general formula
<Chemistry id="chema01" num="0001"><Image id="ia01" he="26" wi="85" file="IMGA0001.TIF" imgContent="chem" imgFormat="TIFF" inline="no" /></Chemistry>wherein
<UnorderedLists id="ula01" listStyle="none"><ListItem>X is a hydrogen atom, a halogen atom, a nitro group, an optionally halogenated alkyl, alkoxy or alkylthio group having 1-6 carbon atoms, or an alkanoyl group having 1-4 carbon atoms;</ListItem><ListItem>Y is a nitrogen atom or a group of the formula CH or CCI;</ListItem><ListItem>Z is a hydrogen atom, a halogen atom, a nitro group, an optionally halogenated alkyl group having 1-4 carbon atoms, or an alkanoyl group having 1-4 carbon atoms;</ListItem><ListItem>n is 0-2;</ListItem><ListItem>R<Sub>1</Sub> is a hydrogen atom, or an alkyl or alkanoyl group having 1-4 carbon atoms;</ListItem><ListItem>R<Sub>2</Sub> and R<Sub>3</Sub> are equal or different and represent hydrogen atoms or alkyl groups having 1-4 carbon atoms; and A is a group of the general formula
<Chemistry id="chema02" num="0002"><Image id="ia02" he="16" wi="35" file="IMGA0002.TIF" imgContent="chem" imgFormat="TIFF" inline="no" /></Chemistry>wherein
<UnorderedLists id="ula02" listStyle="none"><ListItem>R<Sub>4</Sub> is a hydrogen atom, an alkyl group having 1-6 carbon atoms, or a cation of an alkali metal, alkaline earth metal or an alkylated or non-alkylated ammonium group, and R<Sub>s</Sub> and R<Sub>6</Sub> are equal or different and represent hydrogen atoms, dialkylamino groups wherein the alkyl groups each have 1-4 carbon atoms, alkyl groups having 1-4 carbon atoms, or wherein R<Sub>s</Sub> and R<Sub>6</Sub> together with the nitrogen atom to which they are bound can form a heterocyclic ring which may comprise a second hetero atom selected from 0, S or N,</ListItem></UnorderedLists>
with the provisos, that X and Z are not both hydrogen atoms or nitro groups, and that if A is a group of the formula OR<Sub>4</Sub> R<Sub>1</Sub> is not an alkyl group.</ListItem></UnorderedLists>

The compounds have a herbicidal activity After having been processed to compositions, the compounds may be used for controlling undesired plants or for leaf-desiccation in agricultural and horticultural crop in a dosage from 0.01 to 5 kg of active substance per hectare.