abstract |
Compounds of the formula (I) and their salts n n n in which n R 1 to R 4 , A 1 , A 2 , A 3 , Cy and Ar are as defined in claim 1 are suitable as herbicides and plant growth regulators. The compounds (I) can be prepared by processes as claimed in claim 7 via novel intermediates, for example the formula (III) and (V). |