Bayer Materialscience Ag

Bayer Aktiengesellschaft

Haarmann & Reimer Gmbh

Symrise Gmbh & Co Kg

Solarworld Aktiengesellschaft

Bayer Intellectual Property Gmbh

Covestro Deutschland Ag

Stephan Klein

Stefan Wershofen

Matthias Brandt

Andreas Jacob

Hans-Dieter Block

Gerhard Wegener

Jörg Sundermeyer

Christine Mendoza-Frohn

Ingo Wöhrle

Peter Esser

Johannes-Peter Schäfer

Hans-Joachim Leimkühler

Thomas Turek

Hongchao Li

Aurélia Reckziegel

Werner Dick

Zhiping Zhou

Xiaoguang Guo

Yubo Ma

Liguo Wang

Youquan Deng

Maoqing Kang

Xinkui Wang

Fuming Mei

Horst Surburg

Walter Kuhn

Georg Ronge

Hans-Georg Pirkl

Daniel Koch

Kai Verkerk

Rudolf Uchdorf

Dirk Müller

Gerhard Arnold Braun

Dirk Grotjohann

Heinz-Herbert M&uuml;ller

Dirk M&uuml;ller

Anton Vidal-Ferran

Yude He

Shiguo Zhang

Junwei Wang

Qifeng Li

Francese Xavier Rius-Ruiz

Elisenda Reixach

Felix Gärtner

Urethanes are prepared by oxidative carbonylation of at least one amino compound in the presence of carbon monoxide, oxygen and organic, at least one hydroxyl-group-carrying compound. The carbonylation is carried out in the absence of halogen-containing promoters. The carbonylation is also carried out in the presence of a metal complex catalyst which contains neutral bidentate N-chelate ligands of the (N&#x2dc;N) type, two monoanionic N,O-chelate ligands of the general type (N&#x2dc;O)or tetradentate dianionic chelate ligands (O&#x2dc;N&#x2dc;N&#x2dc;O).

Process for the preparation of urethanes

The invention relates to a method for producing urethanes or ureas or mixtures of urethanes and ureas by oxidative carbonylation of organic amines in the presence of carbon monoxide, oxygen and a catalyst, where the catalyst used is a transition metal complex containing the structural feature: [Mn+(O&#x2dc;N&#x2dc;O)2&#x2212;](n&#x2212;2)+(L)m(Z&#x2212;)n&#x2212;2 and the method is carried out under halogen-free reaction conditions. The invention further relates to transition metal complexes containing said structural feature and also to the use of such transition metal complexes as catalysts in the production of urethanes or ureas or mixtures of urethanes and ureas.

The invention is directed to a process for preparing aromatic carbamates which comprises the reaction of an aromatic amine with an organic carbonate in the presence of a catalyst characterized in that ZnO(OAc)is used as catalyst.

Process for preparing aromatic carbamates

The present invention relates to a novel catalyst for producing N-substituted carbamates, the preparation of the catalyst and an improved method for producing N-substituted carbamates from these novel catalysts. The active component of the catalyst is a heteropoly acid and the catalyst support comprises a metal oxide or a metalloid oxide. The catalyst can be used to promote the reaction of carbamate and amine, thereby generating N-substituted carbamates with high yield. In the presence of the catalyst, the reaction conditions are relatively mild, the catalytic activity and selectivity of the reaction are high, and the reaction time is relatively short. Furthermore, the catalyst can be conveniently separated from the reaction system and recycled. therefore, the catalyst can be used to facilitate the further scale-up test and commercial application.

Catalyst for producing N-substituted carbamates, and the preparation and application of the same

The present invention pertains to a novel method for preparing a carbamate, in which the method comprises reacting an aliphatic substituted urea and/or its derivatives, with a hydroxyl group containing compound to obtain a carbamate. In addition, the present invention provides a novel catalyst which is suitable for catalyzing the reaction to form a carbamate, and a method for preparing the novel catalyst. The method of the present invention for preparing a carbamate does not involve the application of carbon monoxide which is toxic, and the reaction conditions are relatively mild with high catalytic activity, high reaction selectivity of the catalyst, and a relatively short reaction time. Furthermore, the catalyst is separated from the reaction system and reused easily, which will facilitates scale up and industrial application.

Method for preparing a carbamate, a catalyst applied in the method, a method for preparing the catalyst and use thereof

The present invention relates to a catalyst for the synthesis of organic carbonates, the preparation of the catalyst and the application of this catalyst in the synthesis of organic carbonates from reacting urea and hydroxyl group containing compounds. The catalyst provided in this invention is a calcinate of hydrous salt containing rare earth element at a moderate calcining temperature.

Catalyst for the synthesis of organic carbonates, process for preparing the same and application thereof

The present invention pertains to a catalyst for the synthesis of organic alkyl carbamates, the method for preparing the same and the use thereof. The catalyst comprises a catalytically active component and a catalyst support, and the catalytically active component being carried by the catalyst support, wherein the catalytically active component comprises a transition metal oxide, and the general formula of the transition metal oxide is EOx, wherein E is selected from transition metal element and x is in the range of 0.5-4.

Catalyst for the synthesis of alkyl carbamates, the method for preparing the same and the use thereof

The invention relates to a method of producing silane or hydrochlorosilanes by disproportionation of a higher chlorinated hydrochlorosilane or a mixture of said hydrochlorosilanes in the presence of a catalyst. Before the catalyst is used, it is a) washed with hyper-pure water in one or several steps; b) transferred in the water-moist state to the reactor in which the disproportionation is to proceed; c) treated in the reactor with boiling methanol or rinsed with anhydrous methanol; and d) the methanol is removed from the catalyst by evacuation and/or stripping with inert gas. The invention further relates to a method for treating disproportionation catalysts.

Method for producing silanes

The present invention relates to a process for preparing cycloalkadienes using supported catalysts based on ReO/&#x3b3;-AlOand also to the use of the resulting cycloalkadienes for the preparation of fragrances.

Process for preparing cycloalkadienes

The present invention relates to supported catalysts based on ReO/(&#x2014;AlOfor use in the preparation of cycloalkadienes in a metathesis reaction, a process for preparing cycloalkadienes in the presence of these supported catalysts and also the use of the resulting cycloalkadienes for preparing fragrances.

Metathesis catalysts

The invention relates to a method for removing anhydrous acids and hydrohalogens from trichlorosilane by contacting the trichlorosilane with solid bases. The invention further relates to the use of the trichlorosilane so purified in the production of silane and/or super-pure silicon.

Method for purifying trichlorosilane

The present invention relates to a process for the production of a dinitronaphthalene isomer mixture, in which naphthalene and/or 1-nitronaphthalene is reacted with nitric acid in the presence of a zeolite.

Process for the production of a dinitronaphthalene isomer mixture with a high proportion of 1,5-dinitronaphthalene

The present invention concerns a process for the production of methylenedianiline (MDA) having a high monomer content.

Method for production of diaminodiphenylmethanes

In a novel process for the synthesis of cinnamic esters or substituted cinnamic esters, carboxylic esters are reacted, by condensation, with benzaldehyde or substituted benzaldehydes, respectively, in the presence of a solid with basic properties.

Cinnamic esters

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Mettmann, Germany

Stephan Klein