| abstract |
New benzofuranylbiphenyl compounds of the formula which are optionally substituted several times with radicals R = hydrogen, C₁-C₄-alkyl, C₁-C₄-alkoxy, halogen, phenoxy and benzyloxy and in which M = hydrogen and / or an equivalent of a non-chromophoric cation and n is a number zero, 1 or 2 and m represent a number zero or 1, with the condition that n and m are not both zero and their production and use as optical brighteners, for example for textiles and paper. The new benzofuranylbiphenyl compounds are characterized by their very good stability combined with excellent lightening properties. |