| abstract |
The herbicide contains at least one compound of the formula and an inert extender or diluent. The diesters of the formula I (b = 0, x = 0) are prepared by reacting a corresponding compound of the formula with 1,3,5-tricyanomethyl-hexahydro-1,3,5-triazine. The monoesters of the formula I (b = 1, x = 0) are prepared by dissolving a diester, prepared as above, in an inert solvent which contains an equivalent amount of water to cause hydrolysis of one (aryl-Xa-O) group. The salts of the formula (b = 0, x = 1) are prepared by dissolving a diester of the formula I in an anhydrous solvent which contains a strong acid of the formula R. In the formulae, aryl, X, Z, a, b and x are as given in Claim 1. |