| 摘要 |
A herbicidal composition which is suitable for selectively controlling weeds in crops and for inhibiting the formation of sucrose in tobacco contains, as active ingredient, novel pyridyloxyphenoxyalkanecarboxylic acid derivatives of the formula I <IMAGE> in which Z denotes a carboxylic acid radical COR3 or a 2-oxazoline radical which is optionally mono- or polysubstituted by lower alkyl, or the cyano group, R3 denotes the hydroxyl group or one of the radicals <IMAGE>, an ester radical -OR4, a thioester radical -SR5 or an amino radical <IMAGE> where the individual symbols have the meanings given in Patent Claim 1. The pyridyloxyphenoxyalkanecarboxylic acid derivatives are prepared by subjecting a halopyridinyl with a meta-hydroxyphenoxyalkanecarboxylic acid derivative or a 4-pyridyloxyphenol with an alpha -haloalkanecarboxylic acid derivative to a condensation reaction.
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