Bayer Aktiengesellschaft

Axel Bader

Dieter Arlt

Volker Eckhardt

Karsten-Josef Idel

Florin Seng

Stefan Meier

Dietmar Fiedel

Frank-Gerald Kleiner

Substituted olefins of the formula (I) ##STR1## are prepared by reaction of a compound of the formula (II) ##STR2## with a compound of the formula (III)

Process for the arylation of olefins

Symmetrical diaryl-acetylenes can be prepared by reacting an aryl halide with acetylene in the presence of a palladium catalyst and a base. If the acetylene is introduced into the liquid reaction mixture using a high intensity gas dispersion means, the aryl halide used can be an aryl bromide.

Process for the preparation of symmetrical diarylacetylenes

Sulphonic acids of bis-styrylbiphenyls, which are useful optical brighteners, are obtained in good yields in a simple manner by reacting styrene compounds with 4,4'-dibromobiphenyl-3,3'-disulphonic acids or their salts in the presence of bases and palladium catalysts. The bis-stilbene compounds have the formula: ##STR1## where at least one of the rings A or B contains a sulfonic acid group.

Bis-stilbene compounds

Low-melting polymers containing at least one Z-configured stilbene group are produced by reaction of Z-configured bifunctional stilbene compounds with bifunctional monomers, oligomers or relatively high molecular weight components at temperatures in the range from -30.degree. to 250.degree. C., optionally in the presence of organic solvents and/or diluents and/or catalysts, the Z-configuration of the stilbene units remaining intact. The low-melting polymers may be processed by standard methods to moldings of various kinds which may be converted by treatment of temperatures of 250.degree. to 500.degree. C. and/or by irradiation at wavelengths of 200 to 800 nm into high-melting plastics articles of high heat resistance.

Process for the production of low-melting polymers containing at least

New Z-stilbene compounds and a process for their preparation are disclosed wherein the compounds correspond to the following formulae: ##STR1##

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Bergisch Gladbach, Germany

Axel Bader