| 摘要 |
WO 93/12094 - 63 - PCT/EP92/02707 of the disclosure: Pyrimidinyl- or triazinyl-oxy (or thio) aldehyde derivatives, processes for their preparation, and their use as herbicides or plant growth regulators It is known that pyrimidinyloxy(thio)- and triazinyloxy (thio)-carboxylic acid derivatives have herbicidal and plant-growth-regulating properties. However, some of the prior art active substance with this type of structure have disadvantages in use, such as, for example, insufficient selectivity in important crops. The invention relates to pyrimidinyloxy(thio) and triazinyloxy(thio) aldehyde derivatives of the formula I with advantageous herbicidal properties: <IMG> (I) in which X, Y, Z, A, Ra and Rb are defined as in claim 1.
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