PROCESS FOR THE PREPARATION OF AMIDOSTYRYLSTILBENE-DISULPHONIC ACID COMPOUNDS

摘要

The present invention relates to a process for the preparation of amidostyrylstilbene-disulphonic acid derivatives represented by formula (1) in which X represents a group of formula (2), (3) or (4), whereby, in formula (2), R1 is hydrogen, C1-C4-alkyl which is unsubstituted or substituted by 1 to 3 halogen atoms, C1-C4-alkyl-C1-C4-alkoxy, phenyl which is unsubstituted or substituted by C1-C4-alkyl, nitro, halogen, SO3M or COOM, amino, mono- C1-C4-alkylamino or phenylamino, whereby the phenyl group is unsubstituted or substituted by C1-C4-alkyl, nitro, halogen, SO3M or COOM; in formula (3), R2 and R3 are hydrogen or together form a 6-membered unsaturated or saturated condensed ring, unbridged or bridged by 1 or 2 carbon atoms, the bond between these substituents being of single- or double-bond character; in formula (4), R4 represents hydrogen, C1-C4-alkyl, nitro, halogen, SO3M or COOM; in formula (1), Y represents phenyl which is unsubstituted or substituted by C1-C4-alkyl, nitro, halogen, SO3M or COOM or represents a heteroaromatic residue and, in any of the above formulae, M represents hydrogen, an alkaline- or alkaline earth-metal cation, or a cation formed from an amine, some of which are new, and use of the novel compounds as fluorescent whitening agents for synthetic or natural organic materials.