abstract |
Compounds of the general formula Iwhere the index and the substituents have the following meanings:n is 0 or 1 to 4;X is O or S;Y is a five-membered heteroaromatic ring;R1 is nitro; cyano; halogen;alkyl; haloalkyl; alkoxy; haloalkoxy; alkylthio;phenyl or phenoxy;R2 is hydrogen;alkyl, alkenyl or alkynyl;or a saturatedy,or unsaturated ring which, in addition to carbon atoms, can also contain hetero atoms as ring members are described. |