55 results about "Dehydrogenative coupling of silanes" patented technology

Compounds and method of preparation of Si—X and Ge—X compounds (X═N, P, As and Sb) via dehydrogenative coupling between the corresponding unsubstituted silanes and amines (including ammonia) or phosphines catalyzed by metallic catalysts is described. This new approach is based on the catalytic dehydrogenative coupling of a Si—H and a X—H moiety to form a Si—X containing compound and hydrogen gas (X═N, P, As and Sb). The process can be catalyzed by transition metal heterogenous catalysts such as Ru(0) on carbon, Pd(0) on MgO) as well as transition metal organometallic complexes that act as homogeneous catalysts. The —Si—X products produced by dehydrogenative coupling are inherently halogen free. Said compounds can be useful for the deposition of thin films by chemical vapor deposition or atomic layer deposition of Si-containing films.

Disclosed is a method of making an aminosilane, the method comprising: forming a reaction mixture comprising a hydridosilane, an amine and a dehydrogenative coupling catalyst in a reactor; subjectingthe reaction mixture to conditions sufficient to cause a dehydrogenative coupling reaction between the hydridosilane and the amine to form the aminosilane and hydrogen gas; and venting the hydrogen gas; wherein the forming of the reaction mixture comprising the hydridosilane, the amine and the dehydrogenative coupling catalyst comprises continuously feeding the hydridosilane to the reactor containing the amine and the dehydrogenative coupling catalyst.

The present disclosure relates to processes and methods of generating hydrogen via the dehydrocoupling of amine boranes using ligand-stabilized homogenous metal catalysts. The amine-borane is shown by the formula (I), R1R2N—BHR3R4. A process is also shown for the preparation of a linear, branched or cyclic polymer which comprises a repeating unit of the formula (II), —[R1R2N—BR3R4]-n, by reacting HR1R2N—BHR3R4 in the presence of at least one ligand-stabilized metal catalyst.

The invention discloses the application of a carbon-supported ruthenium nanomaterial in catalyzing the reaction of aromatic amine and aromatic methanol. Specifically, the carbon-supported ruthenium metal nanometers of the present invention can catalyze the acceptor-free dehydrogenation coupling reaction to synthesize imines with aromatic methanol and aromatic amines as raw materials, and have the characteristics of high conversion efficiency, wide application range, mild reaction conditions and the like. After the conversion reaction, the catalyst was centrifuged out of the reaction system, and the next round of reaction was carried out after simple washing and drying. After 5 cycles, the catalyst remained stable and its catalytic activity did not decrease significantly.

The invention discloses a method for realizing the α-position methylation reaction of ketones under electrochemical conditions. This method adopts an electrochemical dehydrogenation coupling strategy to realize the direct conversion of ketones and methanol to ketones. α In the methylation reaction, under mild electrochemical oxidation conditions, methanol is used as a C-1 source, and ketones and methanol are directly ketones in an oxygen atmosphere under alkaline conditions. α The methylation reaction uses the solvent methanol as the methylation reagent, which has the advantages of environmental protection, atom economy and simple steps. The reaction avoids the use of transition metal catalysts and oxidants, and the operation is simple, the yield is high, and the raw materials are easily available and clean. Environmentally friendly, well in line with the concept of modern green chemistry.

The invention provides a novel catalytic direct dehydrogenation coupling method for synthesis of a thiophene structure-containing alkane compound. According to the method, based on a one-pot process, in the presence of a metal nickel salt as a catalyst, non-functional thiophene compounds containing different functional groups and fatty acid amide containing a positioning group as raw materials, an organic acid as a ligand, a high boiling point polar solvent, an inorganic salt as a base, a silver salt as an oxidizing agent and a phase transfer catalyst undergo a reaction at a temperature of 160 DEG C for 24h to produce a desired compound. Compared with the existing halogenation or lithium salt functionalization method, the method provided by the invention is free of thiophene compound pre-functionalization, greatly reduces intermediate steps, reduces a raw material cost and wastes produced in the reaction and has the characteristics of atom economy and high efficiency.

A high-stable defect-state cerium-zirconium double metal oxide catalyst, a preparation method and its application in light-driven methane molecular dehydrogenation coupling reactions belong to the technical field of methane dehydrogenation coupling. The present invention utilizes reducing metal powder to treat cerium-zirconium bimetallic oxide in a hydrogen atmosphere, and can obtain strongly basic anion-deficient state cerium-zirconium bimetallic oxide by controlling the ratio of cerium-zirconium bimetallic oxide and reducing metal powder material catalyst. The existence of inherent defects and adjustable strong basic sites can make the cerium-zirconium bimetallic oxide effectively adsorb and weaken the C-H bond in methane molecules, and realize the efficient dehydrogenation coupling of methane molecules driven by light at room temperature. The catalyst of the present invention drives methane activation by light, has high efficiency, energy saving, environmental protection, and high atom utilization rate. The design and construction of nano-catalysts and the modification of catalysts can achieve efficient methane dehydrogenation coupling under mild conditions, which can reduce energy consumption and reduce environmental pollution.

Disclosed is a method for preparing 2,2′-dipyridine and derivatives thereof. The method includes: using pyridine represented by formula I or a derivative thereof as a raw material to generate 2,2′-dipyridine represented by formula II by performing dehydrogenative coupling under the action of a supported catalyst in the presence of additives, where R is H, C1-C2 alkyl, Cl, or Br. The method of the present invention features wide adaptability to raw materials, high atomic utilization rate, high catalyst activity, long service life, and fewer by-products.