Process for preparation of fluorescent compounds cationicos of series 1.2 - piranica and process for dyeing or printing of synthetic material fibers modified with acid with employment of said compounds.

摘要

A process for the manufacture of fluorescent cationic compounds of the 1,2-pyran series of the formula I in which A represents a bivalent aromatic residue which is linked in the o-position and may, if desired, be substituted, B represents a bivalent residue which completes the nitrogenous Q ring to an azine ring which may be substituted or condensed with further rings, R represents an alkyl or aralkyl residue which, if desired, may be substituted, N IS 1 OR 2, AND Y represents the equivalent charge of an anion, WHEREIN A THIOACETAMIDE COMPOUND OF THE FORMULA II in which Am represents a primary, secondary or tertiary amino group and B and n have the same meanings as in formula I is converted with a reactive ester of an aliphatic or araliphatic alcohol with an inorganic or organic acid of the formula R - Y'(III) (in which R has the same meaning as in formula I and Y' represents the acid residue corresponding to the anion Y- ) into a cycloammonium compound which latter is then reacted with an aromatic aldehyde, which contains a hydroxyl group in the orthoposition to the aldehyde group, to form a cationic coumarin compound of the formula I, and the starting materials are chosen so that the cationic portion of the final product does not contain any groups that undergo acid dissociation in water.