| abstract |
This invention relates to new compounds of formulae (I, II) in which X is O, S, or NR where R is H or C1-4-alkyl, Z is hydrogen, halogen, trifluoromethyl, C1-8-alkoxy, C1-8-alkyl straight or branched, nitro, C2-8-alkenyl, or a C1-4-alkyl mono- or disubstituted amino group, R<1> is H or straight or branched C1-8-alkyl. The invention also relates to a method of preparing a compound of formulae (I and II). |