Ciba-geigy Corporation

Syngenta Participations Ag

Milos Rusek

Samuel Evans

Sameer H Eldin

Paul Dubs

Kurt Meier

Niklaus Buhler

Bernd Siebenhaar

Zdenek Mazour

Hermann Kny

Paul Radimerski

Jean F Reber

Arpad Major

Raney copper, which is doped (promoted) with an effective quantity of a doping (promoting) agent selected from the group boric acid, onium fluorides, salts of fluorine complex anions, and heteropoly acids, represents an outstanding oxidation catalyst for amine-group-containing primary amines to carboxylic acids.

Process for preparation of aminocarboxylic acids

A process for the preparation of compounds of the general formula ##STR1## where R.sub.1 and R.sub.2 are identical or different and are hydrogen, C.sub.1 -C.sub.18 alkyl, phenyl, C.sub.1 -C.sub.4 alkyl-substituted phenyl, C.sub.7 -C.sub.9 phenylalkyl, C.sub.5 -C.sub.12 cycloalkyl or C.sub.1 -C.sub.4 alkyl-substituted C.sub.5 -C.sub.12 cycloalkyl,

Process for the preparation of hydroxyphenylpropionic acid esters

A process for the preparation of N-alkylanilines is described, the most essential feature of which comprises reacting corresponding anilines at 150.degree. to 300.degree.C. with corresponding alcohols in the presence of a catalyst consisting of silica gel as carrier, of 0.2 to 10% of platinum and of 0.05 to 3% of a compound of a metal of the groups Ia and/or IIa of the Periodic Table, with the catalyst additionally containing at least one compound of an element of the groups Ib, IVa, IVb, Vb, VIIb and VIII in such an amount that the atomic ratio of platinum to the sum of these elements is 1 to 6.

Process for the preparation of N-Alkylanilines

A process for the preparation of indoline without substantial formation of indole, comprises passing 2-(2-aminophenyl)ethanol, in a vapor phase and admixed with a carrier gas, at a temperature of from about 240.degree. to about 260.degree. C. over at least a catalytic amount of a metal silicate or aluminosilicate containing alkaline earth metal or rare earth metal ions. The carrier gas can be water in the form of steam. The passage of 2-(2-aminophenyl)ethanol over the catalyst can be periodically terminated and the catalyst reactivatd by passing a mixture of air and nitrogen over the catalyst at a temperature of from about 300.degree. to about 550.degree. C., after which the passage of 2-(2-aminophenyl)ethanol and carrier gas can be resumed.

Process for the preparation of indoline

A process is described for the selective production of hydrogen by means of heterogeneous photoredox catalysis, in which mixtures of water and alkali metal sulfites or sulfides, alkaline earth metal sulfites or sulfides or ammonium sulfites or sulfides are reacted under the action of light in a suspension of a cadmium sulfide, cadmium sulfoselenide or titanium dioxide/semiconductor powder which is at least partially coated with Cu, Cr, Ni, Co or a noble metal or mixtures thereof. The catalysts which can be employed in this process (coated semiconductor powders) are in some cases novel.

Process for the production of hydrogen by means of heterogeneous

A process for producing .alpha.,.beta.-unsaturated alkenyl ethers by cleavage of acetals in the gas phase and in the presence of a catalyst, the catalyst used being calcium oxide, the acetal cleavage being performed in the temperature range of 200.degree. to 300.degree. C. and the process being carried out preferably in a simple distilling apparatus.

Process for producing unsaturated ethers

A process for the preparation of 2,6-dialkyl-N-alkylanilines is disclosed, which process comprises the reaction of a 2,6-dialkylaniline with an alkanol at 200.degree. to 350.degree. C. in the presence of a copper-containing catalyst which contains 0.05 to 10% by weight of palladium or platinum.

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Binningen, Switzerland

Milos Rusek