Bayer Aktiengesellschaft

Lanxess Deutschland Gmbh

Thomas Prinz

Hans-Joachim Traenckner

Wilhelm Keim

Jorg-Dietrich Jentsch

Birgit Driessen-Holscher

Guido Giffels

Claus Dreisbach

Joachim Kralik

Christian Steffens

Inga Ritzkopf

Walter Lange

Birgit Driessen-H&ouml;lscher

Hans-Christian Militzer

Markus Eckert

Hans-Ulrich Buschhaus

Jürgen Kintrup

Benjamin Meseguer

Torsten Pohl

Wolfram Sirges

Ulrich Scholz

Andreas Schulze Tilling

Steffen Kahlert

Jörg-Dietrich Jentsch

Birgit Drieben-Hölscher

Birgit Drieβen-Hölscher

Friederike Agel

Hans-Jürgen Grob

Gerald John

Hans-Jürgen Gross

The novel process for preparing dialkyl dicarbonates by reacting the corresponding alkyl haloformates with alkali metal hydroxides, alkaline earth metal hydroxides and/or carbonates in the presence of water-immiscible organic solvents and in the presence of a catalyst is characterized in that the catalyst used is at least one tertiary alkylamine of the formula (I)NRRR,&#x2003;&#x2003;(I)where the substituents are each as defined in the description.

Process for preparing dialkyl dicarbonates

Alcohols prepared by reacting carboxylic acids and/or carboxylic esters with hydrogen in the presence of a special catalyst.

Process and catalyst for preparing alcohols

The present invention relates to catalysts comprising chiral monophosphorus compounds and their use, the chiral monophosphorus compounds themselves and also their precursors.

Chiral monophosphorus compounds

The invention relates to the biphenyldiols of the formula (V) The corresponding racemic and enantiomerically pure triflate compounds thereof, where Rand Rare H, Ris chlorine, and Ris methoxy. In an alternate embodiment, Rand Rare hydrogen and Rand Rare C-C-alkoxy, fluorine, or chlorine.

Biphenydiols

Diphosphines

The invention relates to the preparation of enantiomerically pure bis-diphenylphosphine oxides in a particularly advantageous manner by (1) reacting an aromatic bromine compound with a diphenylphosphinic chloride in a mixture of tetrahydrofuran and an aromatic hydrocarbon to give a diphenylphosphine oxide, which is isolated from a solution in an aromatic hydrocarbon by adding a saturated aliphatic hydrocarbon; (2) metalating the resulting diphenylphosphine oxide in the 6-position and reacting the metalated diphenylphosphine oxide with iodine at temperatures not less than &minus;25&deg; C. in such a way that a small amount of iodine is always present in excess, giving a 2-iodo-diphenylphosphine oxide; (3) preparing a racemic bis-diphenylphosphine oxide from the resulting 2-iodo-diphenylphosphine oxide using copper and an aromatic hydrocarbon solvent and crystallizing the racemic bis-diphenylphosphine oxide from a solution in an aromatic hydrocarbon; and (4) separating isomers using an enantiomerically pure mono- or dicarboxylic acid to obtain a first enantiomer by crystallization from a solution in an aromatic hydrocarbon and obtaining a second enantiomer by hydrolysis and subsequent crystallization from a solution in an aromatic hydrocarbon.

Process for the preparation of enantiomerically pure (5, 5&prime;-dichloro-6,6&prime;-dimethoxy-biphenyl-2,2&prime;-diyl)- bis(diphenylphosphine oxides)

Process for the preparation of octa-2,7-dienyl-1-amine by telomerization of butadiene with ammonia in a two-phase system in the presence of hydrophilic palladium complexes, characterized in that octa-2,7-dienyl-1-amine and octa-1,7-dienyl-3-amine are isolated separately from one another from the reaction mixture present after telomerization, and the octa-1,7-dienyl-3-amine isolated in this way is subjected to an isomerization reaction to form octa-2,7-dienyl-1-amine, and also novel triphenylphosphine mono- and dimethoxytri(sodium sulphonates) and the use of triphenylphosphine trimethoxytri(sodium sulphonates), triphenylphosphine trimethyltri(sodium sulphonates) and triphenylphosphine trifluorodi- and tri(sodium sulphonates) as ligands for the preparation of palladium complexes.

Triphenylphosphine mono and dimethoxy tri-sodium sulphonates

Process for the preparation of octa-2,7-dienyl-1-amine from butadiene

In a process for the telomerization of dienes with nucleophiles in a liquid two-phase system, use is made as catalysts of complexes comprising a transition metal as central atom and at least one tris-(hydroxyalkyl)-phosphine or -phosphine oxide as ligand. The use as catalysts of compounds comprising a transition metal as central atom and at least one tris-(hydroxy-C.sub.2 -C.sub.5 -alkyl)-phosphine or -phosphine oxide as ligand, new compounds of this type and aqueous solutions of such compounds are likewise described.

Complexes containing tris-(hydroxyalkyl)-phosphines as ligands for

Octa-2,7-dienyl-1-amine and octa-1,7-dienyl-3-amine, from which octyl-1-amine can be prepared, are prepared selectively by telomerizing butadiene and ammonia in a two-phase system, the catalyst being used in an aqueous phase and an organic medium which is immiscible or only slightly miscible with water being employed as the second phase.

Process for the preparation of primary octadienylamines

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Leverkusen, Germany

Thomas Prinz