Bayer Aktiengesellschaft

Kernforschungsanlage Julich Gesellschaft MIT Beschrankter Haftung

Siemens-allis, Inc.

Bayer Aktiengsellschaft

Bayer Aktiengesselschaft

Heinz U Blank

Horst Behre

Gerhard Marzolph

Gerhard Bonse

Erich Wolters

Wilhelm Brandes

Erich Hammerschmidt

Peter Schnegg

Herbert Emde

Edwin Ritzer

Friedrich Werner

Willi Streicher

Paul Reinecke

Alexander Klausener

Helmut Fiege

Theodor Pfister

Heinz Landscheidt

Bernhard Beitzke

Dietmar Mayer

Werner Mentzel

Wolfgang Schenk

Hans W Linden

Otto Lindner

Gunther Klag

Norbert Langenfeld

Gerd Hanssler

Helmut Kraus

Ferdinand Hagedorn

Herbert Diehl

Rolf Putter

Helmut Judat

Otto Neuner

Friedrich Durholz

Hans Kratzer

Willi Schossler

Bernd-Michael Konig

Friedrich-Wilhelm Ullrich

Guido Skipka

Eike Gabel

Uwe Heinz

Gunter Silber

Ernst Goldschmitt

Hans Scheinpflug

Dieter Dieterich

Karlfried Wedemeyer

Rudolf Braden

Franz-Josef Mais

Guido Steffan

Volker Paul

Helmut Timmler

Stefan Antons

Thomas Schmidt

Heinz Ziemann

Udo Birkenstock

Alfons Dorlars

Karlheinrich Meisel

Klaus-Christian Paetz

Viktor Trescher

Wolfgang Eymann

Gunter Rauchschwalbe

Werner Evertz

Karl Mannes

Karl-Wilhelm Henneke

Rolf Schimpf

Walter Bohm

Michael Herzhoff

Roland Busse

Gerhard Burmeister

Dieter Irmscher

Volkmar Handschuh

Walter Kipshagen

Nikolaus Schulz

Wolf Mehl

Paul Volker

Gunter Rottloff

Karl W Muller

Alfred Seyberlich

Gunther Gramm

Herbert Nordt, Deceased

Wolfgang Heydkamp

Halmut Kraus

Dieter Brueck

Heinz-Gerd Hartges

Lothar Jakob

Process for preparing 4,6-diamino-resorcinol dihydrochloride

Process for the preparation of alkyl aryl ethers containing carboxyl groups which are suitable for the preparation of colour film couplers, or derivatives thereof, by reaction of aromatic alcohols with alkyl halides containing carboxyl groups or derivatives thereof and basic alkali metal or alkaline earth metal compounds, characterized in that the reaction is carried out in the melt of the aromatic alcohol.

Process for the preparation of alkyl aryl ethers containing carboxyl

Process for preparing haloaromatic amines by catalytic hydrogenation of the corresponding halonitroaromatic compounds, characterized in that iron-containing Raney nickel is used as catalyst, where the haloaromatic amines prepared can be used for the synthesis of photographic couplers which are useful in photographic emulsions or elements.

Hydrogenation of halonitroaromatic compounds

Mononitrohalogenobenzenes can be prepared by mixing halogenobenzene, nitric acid, sulphuric acid and water intensively with one another, simultaneously or in succession in their total quantity, and by redispersing them at least twice in the case of continuous preparation, applying a mixing energy of 1-40 watts per liter of the overall reaction mixture, preferably 3-30 W/l, largely suppressing back-mixing in the continuous procedure, and observing adiabatic reaction conditions.

Process for the adiabatic preparation of mononitrohalogenobenzenes

Mononitrotoluenes can be prepared by intensively mixing together toluene, nitric acid, sulphuric acid and water, simultaneously or successively in their total amount, and, in the case of continuous preparation, redispersing the mixture at least twice, for which purpose a mixing energy of 1 to 40 watts per liter of the total reaction mixture, preferably 3 to 30 W/l, is employed per volume of the reactor, and, for the continuous procedure, the back mixing is substantially repressed. Adiabatic reaction conditions are maintained.

Process for the adiabatic preparation of mononitrotoluenes

Aromatic amines which are substituted by C.sub.1 -C.sub.4 -alkoxy in the p-position are prepared by catalytic hydrogenation of the underlying aromatic nitro compounds in a reaction medium comprising sulphuric acid and a C.sub.1 -C.sub.4 -alcohol by a Bamberger type rearrangement at elevated temperature, advantageously by carrying out the catalytic hydrogenation under elevated pressure.

Process for the preparation of aromatic amines which are substituted by

Dialkyl carbonates can be prepared by reacting carbon monoxide with alkyl nitrites over a modified platinum metal supported catalyst at an elevated temperature in a continuous gas phase reaction, the reaction being carried out with the exclusion of additional oxidizing substances and, if appropriate, the presence of a lower alcohol.

Process for the preparation of dialkyl carbonates

Dialkyl carbonates can be prepared by reaction of carbon monoxide with alkyl nitrites in continuous gas phase reaction, in which a platinum metal halide catalyst on aluminum oxides, aluminum oxide hydrates or aluminum hydroxides as support and, if desired, an additive comprising an antimony, bismuth, aluminum, copper, vanadium, niobium, tantalum, tin, iron, cobalt, nickel compound or a mixture of a plurality thereof on this catalyst are used and hydrogen halide is replaced during the course of the reaction batchwise or continuously in at least the amount which is discharged from the reactor together with the reaction mixture. This results in the formation of dialkyl carbonates in almost quantitative selectivity, while the corresponding dialkyl oxalates can not in most cases be detected. The abovementioned supports are characterized by a BET surface area of more than 1 m.sup.2 /g.

Aromatic (di)chlorosulphonic acids and (di)bromosulphonic acids can be prepared by reacting aromatic sulphonic acids with chlorine or bromine respectively, the reaction advantageously being carried out in the melt of the aromatic sulphonic acids.

Process for the preparation of aromatic (di)chlorosulphonic acids and

Indoles of the formula ##STR1## can be prepared by reaction of a phenylhydrazine of the formula ##STR2## which is unsubstituted in at least one ortho-position, with a ketone of the formula ##STR3## in an aqueous medium in the presence of an acid compound, less than 5 equivalents, based on 1 mol of phenylhydrazine, of an acid compound having a pK value of 1.3-4.5 being employed.

Process for the preparation of indoles

Aminomethylene compounds of the formula ##STR1## can be prepared by reaction of C-H acid compounds of the formula ##STR2## with salts of the formula ##STR3## in the presence of alkoxides of the formula

Process for the preparation of aminomethylene compounds

Benzaldehydes of the formula ##STR1## can be obtained by reaction of substituted .beta.-amino-styrenes of the formula ##STR2## in which R.sup.1, R.sup.2, R.sup.3, R.sup.4, R.sup.5, R.sup.8, R.sup.9, R.sup.10, m, n and o have the scope of meaning indicated in the description, with oxygen in the presence of a Cu compound in the solution of an aprotic polar solvent at 0.degree.-120.degree. C.

Process for the preparation of benzaldehydes

Substituted 3,5-dichloro-2,4-difluoro-benzenes of the formula ##STR1## in which R represents nitro, amino (including the corresponding ammonium salts) or isocyanato, which can be prepared from 2,3,4,5-tetrachloro-nitrobenzene by means of the reaction, carried out initially, with alkali metal fluorides at elevated temperature in a polar, aprotic solvent, starting from a crude 2,3,4,5-tetrachloro-nitrobenzene containing 2,3,5,6-tetrachloro-nitrobenzene and/or 2,3,4,6-tetrachloro-nitrobenzene, and substituted 3,5-dichloro-2,4-difluoro-benzene being isolated from the reaction mixture at the nitro stage or, after reduction of the nitro group, at the amino stage or, after reduction and phosgenation of the amino group, at the isocyanate stage.

Process for the preparation of substituted

The new 1,3-di-arylmethoxy-4,6-dinitrobenzenes of the formula ##STR1## in which R.sup.1 and R.sup.2 independently of one another denote hydrogen or C.sub.1 -C.sub.4 -alkyl and

1,3-di-arylmethoxy-4,6-dinitro-benzenes, process for their preparation

Cyclopropanecarboxamide can be prepared by reaction of a cyclopropanecarboxylic ester with NH.sub.3, in which the ester alcohol has 4-8 C atoms and can be straight-chain or branched and which process is carried out in the presence of catalytic amounts of an alkali metal alcoholate of a monohydric C.sub.1-C.sub.8 alcohol at 60.degree.-200.degree. C. in the absence of a hydrocarbon solvent.

Process for the preparation of cyclopropanecarboxamide

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Heinz U Blank