Bayer Aktiengesellschaft

Alfons Dorlars

Carl-Wolfgang Schellhammer

Otto Neuner

Erich Klauke

Ernst Kysela

Heinz U Blank

Florin Seng

Arnd Stuwe

Hans Theidel

Viktor Trescher

Walter Horstmann

Heinrich Gold

Wolf-Dieter Wirth

Herbert Nordt, Deceased

In the preparation of a cinnamic acid by reacting the corresponding benzaldehyde with ketene in the presence of a catalyst, the improvement which comprises using as the catalyst an iron and/or zinc salt of a mono- or di-carboxylic acid with 2 to 20 carbon atoms containing free carboxylic acid and/or anhydride, and then splitting the reaction product in the temperature range from 100.degree. to 250.degree. C. with an acid or basic catalyst.

Process for the preparation of optionally substituted cinnamic acid in

Water-soluble 2-aryl-v-triazoles are obtained in a simple manner and in surprisingly good yields when corresponding .alpha.-oximinoarylhydrazones are heated to temperatures of 120.degree.-200.degree. C. in water or predominantly aqueous media in the absence of the cyclizing agents which are otherwise customary. The process products are valuable UV-absorbers or optical brighteners.

Process for the preparation of v-triazole compounds

The present invention relates to a process for the preparation of 2,4,6-trifluoro-1,3,5-triazine (TFT) from 2,4,6-trichloro-1,3,5-triazine (TCT) or from mixed chlorinated/fluorinated 1,3,5-triazines by fluorination with sodium fluoride in dipolar aprotic solvents. The process is characterized in that TCT or mixed chlorinated/fluorinated 1,3,5-triazines or mixtures thereof are metered into a suspension of sodium fluoride in a dipolar, aprotic solvent, which is warmed to a temperature of between 120.degree. C. and 220.degree. C. and optionally contains a further solvent.

Process for the preparation of 2,4,6-trifluoro-1,3,5-triazine

Triazolylphenyl-triazines of the formula ##STR1## wherein R.sub.1 and R.sub.2 denote alkyl or aryl and

The subject matter are triazolyl-stilbenes of the formula ##STR1## wherein R.sub.1 represents an optionally substituted styryl, biphenylyl or naphthyl radical, R.sub.2 represents hydrogen, halogen, or an alkyl or phenyl radical and R.sub.3 represents nitrile, carboxyl or carboxylic acid ester, as well as their preparation and their use as optical brighteners.

Triazolyl-stilbenes

Coumarine compounds of the formula ##STR1## in which R.sub.1 and R.sub.2 denote hydrogen, alkyl, cycloalkyl, aralkyl, aryl, nitrile, carboxyl, carboxylic acid ester or carboxylic acid amide groups, or together form a nonaromatic 5-membered or 6-membered ring system,

3-(Halopyrazolyl)-7-triazolyl-coumarin compounds

Process for the preparation of bis-triazolylstilbene compounds which, in the form of the free acid, correspond to the formula ##STR1## wherein the phenyl radicals A can be substituted by halogen, C.sub.1 -C.sub.4 -alkyl or C.sub.1 -C.sub.4 -alkoxy, from bis-hydroxyiminohydrazonostilbene compounds of the formula ##STR2## characterized in that the bis-hyroxyiminohydrazonostilbene compounds are reacted with anhydrides of lower carboxylic acids in the presence of urea and polar solvents at temperatures from 10.degree. to 60.degree. C.

Process for the preparation of bis-triazolylstilbenes

Process for the preparation of triazines containing a mixture of chlorine and fluorine substituents, characterized in that cyanuric chloride is heated with cyanuric fluoride to temperatures from 30.degree.-300.degree. C. in the presence of suitable catalysts.

Process for the preparation of triazines containing a mixture of

Coumarine compounds of the formula ##STR1## IN WHICH R.sub.1 and R.sub.2 denote hydrogen, alkyl, cycloalkyl, aralkyl, aryl, nitrile, carboxyl, carboxylic acid ester or carboxylic acid amide groups, or together form a nonaromatic 5-membered or 6-membered ring system, R.sub.3 represents hydrogen, or alkyl or aryl radicals and Hal represents bromine or preferably chlorine as well as their production and use as optical brighteners.

3-Pyrozolyl-4-triazolyl compounds

Triazolyl-coumarins of the formula ##STR1## wherein R.sub.1 to R.sub.4 and X are as defined herein, or their quaternization products are useful as brightening agents.

Triazolyl-coumarins

The stilbene compound of the formula ##SPC1## Exists in three crystal modifications. Two of them are valuable as brighteners for preparing colorless detergents. The stilbene compound is prepared from the corresponding sulphonic acids, their mono- or di-sodium salts.

Triazolyl stilbene brighteners method of preparing and detergents

Compounds of the formula ##SPC1## Wherein R.sub.1 and R.sub.2 denote hydrogen, halogen, nitrile, alkoxy, alkyl, aryl, cycloalkyl, aralkyl, carboxyl or carboxylic acid ester groups are suitable for the optical brightening of synthetic organic high molecular materials.

Optical brighteners

3-Aryl-7-pyrazolyl-coumarin compounds of the formula ##SPC1## In which R stands for hydrogen, halogen, alkyl or alkoxy radicals, n represents the numbers 1-3, R.sub.1 and R.sub.2 represent, hydrogen or alkyl or phenyl radical, R.sub.1 and R.sub.2 may also form, together with the two carbon atoms of the pyrazole ring, a non-aromatic carbocyclic, 5- or 6-membered ring system, radical as well as their production and use as brightening agents.

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Leverkusen, Germany

Alfons Dorlars