CHROMONE-8-ALDEHYDES, THIOCHROMONE-8-ALDEHYDES AND MANUFACTURE

1. Compounds of the formula see diagramm : EP0123113,P8,F1 in which R1 represents hydrogen, a C1-C8 aliphatic hydrocarbon radical, a C1-C8 alkyl carboxylate, or a radical from the group comprising phenyl, naphthyl, thienyl, furyl, pyrryl, pyrazolyl, imidazolyl, oxazolyl, isoxazolyl, thiazolyl, pyridyl, pyridazinyl, pyrimidyl, pyrazinyl, isoquinolyl, indolyl, benzimidazolyl, quiazolyl or quinoxalyl or quinoxalyl which optionally has 1-5 identical or different fluorine, chlorine, bromine, iodine, C1-C8 alkythio, C1-C8 alkylsulphinyl, cyano, hydroxyl, nitro, C1-C4 monofluoroalkyl or polyfluoroalkyl, C1-C4 monofluoroalkoxy or polyfluoroalkoxy, C1-C4 monofluoroalkylthio or polyfluoroalkylthio, amino, C1-C5 monoalkylamino or C1-C5 -dialkylamino substituents, R2 represents hydrogen or one to three fluorine or chlorine atoms, and A represents a single bond or a C1-C18 -alkylene chain which can optionally be interrupted by O or S.