Verfahren zur Herstellung heterocyclischer,Aethylendoppelbindungen enthaltender Verbindungen

摘要

The present invention relates to a process for the optical brightening of organic materials using compounds of the formula IN WHICH A REPRESENTS HYDROGEN, HALOGEN, THE METHYL GROUP OR THE METHOXY GROUP, Z1 and/or Z2 denotes a ring member =CH- or =N- and alpha represents a hydrogen atom, a phenyl residue or a residue of the series IN WHICH (I) at least one residue alpha differs from hydrogen or phenyl and has the significance of one of the other residues quoted for alpha , and in which (II) terminal phenyl or naphthyl residues may contain alkyl, halogen or alkoxy groups. These new compounds represent valuable optical brightening agents.