Basf Aktiengesellschaft

Base Aktiengesellschaft

Hardo Siegel

Walter Himmele

Walter Gramlich

Ulrich Koehler

Dieter Degner

Jochem Henkelmann

Werner Hoffmann

Dieter Jahn

Christoph Martin

Bruno Wuerzer

Rolf Hartmuth Fischer

Rainer Becker

Herbert Naarmann

Manfred Julius

Dieter Hermeling

Harald Rust

Manfred Eggersdorfer

Norbert Goetz

Wolfgang Siegel

Ernst-Heinrich Pommer

Joachim Paust

Wolfgang Hoelderich

Bernhard Hauer

Tom Witzel

Randolf Hugo

Matthias Irgang

Eckhard Hickmann

Werner Aquila

Wolfgang Ladner

Wolfgang Spiegler

Heinz Hannebaum

Axel Paul

Karl Von Fraunberg

Alfred Krause

Sigberg Pfohl

Werner Kuesters

Bryan Cooper

Gerhard Fritz

Hans J Pander

Alfred Schuhmacher

Walter Grosch

Eberhard Ammermann

Hubert Sauter

Franz Merger

Michael Keil

Michael Hesse

Peter Bassler

Wolfgang Harder

Wolfgang Rohr

Heinrich Adolphi

Hans Theobald

Karl Kiehs

Dieter Lenke

Hans-Martin Weitz

Werner Steck

Hartwig Voss

Friedrich Linhart

Michael Kroener

Josef Gries

Guenther Seybold

Albrecht Franke

Hans Rupert Merkle

Horst Koenig

Gerda Von Philipsborn

Werner Fliege

Wolfgang Habermann

Ursula Seeliger

Rainer Buerstinghaus

Horst Neuhauser

Peter Lechtken

Hans-Juergen Weyer

Claus D Mueller

Winfried Richarz

Peter Tonne

Joachim Meyer

Helmut Lermer

Juergen Frank

Peter Hammes

Wolfgang F Mueller

Uwe Pressler

Heinz Pohlemann

Guenther Huber

Bjoern Girgensohn

Stefan Marcinowski

Frank Heimann

Karl-Heinz Geiss

Ernst Langguth

Horst Ralf Staudenmaier

Otto Woerz

Manfred Barl

Thomas Ruehl

Peter Jaeger

Ursula Mueller

Eckhard Roske

Thomas-Michael Kahl

Gerhard Schindler

Hans-Richard Mueller

Hans J Schrepfer

Wolgang Ladner

Gerhard Kastner

A process for the simultaneous production of dicarboxylic acids and diamines from a) polymers based on polyamides of dicarboxylic acids or their derivatives with diamines, or

Simultaneous production of dicarboxylic acids and diamines by splitting

Sterically hindered 4-amino-piperidine with a low dimer content, its

Process for purifying sterically hindered 4-amino piperidines

A process for hydroxylating compounds of the formula ##STR1## where n, A and R.sup.1 to R.sup.4 have the meanings stated in the description, with the aid of microorganisms of the genus Beauveria.

Process for the hydroxylation of aromatic acids using strains of the

A process for the purification of tertiary phosphine oxides obtained in a Wittig synthesis as a contaminated by product resulting from the reaction of the corresponding tertiary phosphines, especially triphenylphosphine. The contaminated tertiary phosphine oxides coming from this Wittig synthesis have the formula I ##STR1## in which R.sup.1, R.sup.2, and R.sup.3 denote C.sub.1 -C.sub.12 alkyl, C.sub.5 -G.sub.8 cycloalkyl, aryl, C.sub.7 -C.sub.20 aralkyl, or C.sub.7 -C.sub.20 alkylaryl. The contaminated phosphine oxide I or phosphine oxide I-containing mixtures, optionally in an inert solvent, are first caused to react with an inorganic or organic acid at temperatures of from 0.degree. to 150.degree. C. to form a crystallized acid salt. The resulting salt crystals are then treated in a purifying step with water or an inorganic base or an organic base to again form the tertiary phosphine oxide. This reformed oxide is then extracted with an inert organic solvent from which the purified tertiary phosphine oxide is finally liberated.

Purification of tertiary phosphine oxides

A process for preparing 2,2,6,6-tetramethylpiperidin-4-one (TAA) is described, wherein a mixture comprising acetone and/or acetone condensates and ammonia in a molar ratio of from 20:1 to 3:1 at from 50.degree. to 130.degree. C. is reacted in the presence of dimethyl sulfate, the amount of dimethyl sulfate being from 0.5 to 5 mol-%, based on acetone.

Preparation of 2, 2, 6, 6-tetramethylpiperidin-4-one (TAA)

A process for preparing tertiary amine oxides with a low nitrosamine content by reacting a tertiary amine with an aqueous solution of hydrogen peroxide, which comprises using as starting material tertiary amines whose total content of primary and secondary amines is not more than 0.05% by weight.

Preparation of tertiary amine oxides

2-Methyl-1,4-butanediol and 3-methyltetrahydrofuran are prepared by reacting a compound of the general formula I or II ##STR1## where R.sup.1 and R.sup.2 are each hydrogen or C.sub.1 -C.sub.8 -alkyl and the formyl group of II may also be present as acetal with a C.sub.1 -C.sub.8 -alkanol, is reacted with hydrogen in the presence of copper or of a metal of groups 7 to 10 of the Periodical Table of elements or of a compound of these metals.

Preparation of 2-methyl-1,4-butanediol and 3-methyltetrahydrofuran

Triphenylphosphine (TPP) is prepared by reacting triphenylphosphine dichloride (TPPCl.sub.2) with magnesium, aluminum and/or iron in the presence of an inert solvent, employing a TPPCl.sub.2 solution whose content of phosgene, chlorine, diphosgene, hydrogen chloride, thionyl chloride, sulfuryl chloride, phosphorus trichloride, phosphorus oxychloride and/or aliphatic halogen compounds (active chlorine compounds) totals less than 1000 ppm Cl.

Preparation of triphenylphosphine

A process for the preparation of a 5-vinylpyrrolidone of the formula ##STR1## wherein each of R.sup.1 and R.sup.2 is hydrogen or alkyl and R.sup.3 is preferably hydrogen but may further represent alkyl, cycloalkyl, aryl, alkylaryl, arylalkyl or a 5- to 6-membered aromatic or non-aromatic heterocyclic group containing 1 to 3 nitrogen atoms and/or an oxygen or sulfur atom, the process being carried out in two steps, first to react a 3-formylpropionic acid ester of the formula ##STR2## where each of R.sup.1 and R.sup.2 is hydrogen or C.sub.1 -C.sub.8 -alkyl, and R.sup.4 is hydrogen, alkyl, cycloalkyl, aryl, alkylaryl or arylalkyl, with a vinylymagnesium halide of the formula

Preparation of 5-vinylpyrrolidones

A process for the preparation of 4-substituted imidazoles of the general formula ##STR1## in which R denotes C.sub.1 -C.sub.20 alkyl, C.sub.3 -C.sub.20 cycloalkyl, aryl, and C.sub.7 -C.sub.20 aralkyl, wherein

Preparation of 4-substituted imidazoles from

Preparation of 2-(4-hydroxyphenoxy)propionic acid by fermentation

Abstract of the disclosure: A process for the continuous preparation of 3-cyano-3,5,5-trimethylcyclohexanone by base-catalyzed reaction of isophorone and hydrogen cyanide, comprises carrying out the reaction in two separate reaction zones

Continuous preparation of 3-cyano-3,5,5-trimethylcyclohexanone

A process for the preparation of a 1,4-alkylenediamine of the general formula I ##STR1## in which the substituents R.sup.1 and R.sup.2 are independently hydrogen, C.sub.1 -C.sub.10 -alkyl, phenyl or benzyl, by reacting a succinic dinitrile of the general formula II ##STR2## in which R.sup.1 and R.sup.2 have the meanings stated, with hydrogen at a temperature of from 30.degree. to 250.degree. C. and a pressure of from 50 to 350 bar in contact with a hydrogenation catalyst, wherein the hydrogenation catalyst used contains cobalt oxide and one or more oxides of the elements iron, nickel, manganese, chromium, molybdenum, tungsten, and phosphorus and one or more oxides of elements in the alkali metal group, alkaline earth metal group, and rare earth group of the Periodic Table, and of scandium, and/or of yttrium.

Preparation of 1,4-alkylenediamines

Poly(1,4-butanediol-.omega.,.omega.'-mercaptans) have the general formula

Process for preparing a

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Speyer, Germany

Hardo Siegel