| abstract |
Parasiticidal new substituted thienopyranones of the formula <IMAGE> I in which X represents O or S, R1 and R2 independently of one another represent hydrogen, halogen, CN, NO2, alkyl, aralkyl, aryl, alkylcarbonyl or alkoxycarbonyl, or, together with the adjacent C atoms, form a carbocyclic ring which is optionally interrupted by heteroatoms, R3 represents optionally substituted alkyl or phenyl, R4 represents hydrogen or alkyl, R3 and R4, together with the adjacent nitrogen atom, represent a heterocyclic 5- or 6-membered ring. Some of the intermediates for making them are also new. |