with the proviso that X represents C2-C4-alkyl, chlorine, bromine, iodine or C1-C4-alkoxy when Y represents bromine, A particularly preferably represents a C1-C4-alkylidenediyl radical, B particularly preferably represents hydrogen, C1-C4-alkyl or C1-C4-alkoxy-C1-C2-alkyl, D particularly preferably represents in each case optionally mono- to penta-fluorine-, -chlorine- or -cyano-substituted C1-C4-