Aromatic azomethines
AssigneeHoechst Aktiengesellschaft
InventorWilfried Sahm
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Abstract
Novel azomethines are obtained when reacting a tertiary amine with an aromatic aldehyde or ketone having in orthoposition an activated methoxy group. These azomethines are capable of ring closure to yield a benzofurane and said tertiary amine. The benzofuranes are optical brighteners, tranquilizers or intermediates for optical brighteners, fluorescent dyestuffs, scintillators, sensibilizers for electrophotographic coatings.
Claims5
A compound of the formula ##STR62## in which A is phenyl or naphthyl which is unsubstituted or substituted by halogen, lower alkyl, lower alkoxy, lower alkylene forming an annellated ring, or phenyl, R is hydrogen, lower alkyl or phenyl, E is lower tertiary alkyl, phenyl, chlorophenyl, lower alkyl phenyl, lower hydroxyalkyl phenyl or naphthyl and D' is phenyl, naphthyl, styryl, or a bivalent group selected from ethenylene, phenylene and p,.omega.-styrylene which bivalent group is substituted by a group of the formula ##STR63## in which A, R and E are as defined above, which radical D' may be substituted by carboxy, lower carboalkoxy, cyano, or nitro.
Dependencies are inferred from the claim text.