[EN] SILICA-BASED ZINC CATALYSTS. THEIR PREPARATION AND USE IN THE ALKOXYCARBONYLATION OF AMINES<br/>[FR] CATALYSEURS AU ZINC À BASE DE SILICE, LEUR PRÉPARATION ET LEUR UTILISATION DANS L'ALCOXYCARBONYLATION D'AMINES
申请人:COVESTRO DEUTSCHLAND AG
公开号:WO2018210711A1
公开(公告)日:2018-11-22
The present invention relates to silica-based heterogeneous zinc compounds which are suitable as catalysts in the reaction of amines with dialkyl carbonates to produce carbamates. The catalysts have the formula [SiO2]-CH2-CHR-X-COOZn[Y], wherein [SiO2] represents a silica carrier selected from the group consisting of ordered mesoporous silica and irregular amorphous narrow pore silica, R represents a moiety selected from the group consisting of hydrogen, -CH3, and -CH2CH3, preferably hydrogen, X is an aliphatic chain of 2 to 11 carbon atoms that optionally comprises ether moieties and [Y] represents a mono anion. The invention is also directed towards a method for the preparation of the aforementioned compounds and towards method for the alkoxycarbonylation of amines.
polymethylation of aromatic amines with dimethyl carbonate (DMC). N-methylation prevails over carbamoylation even though they are competing parallel processes. The present N-methylation protocol using DMC enjoys advantages such as convenient reaction conditions, benign, reusable, cost-effective catalyst, avoids the use of additional solvent and uses a safe, green methylating agent that only produces CO2 and methanol
Gold-Catalyzed Phosgene-Free Synthesis of Polyurethane Precursors
作者:Raquel Juárez、Patricia Concepción、Avelino Corma、Vicente Fornés、Hermenegildo García
DOI:10.1002/anie.200905160
日期:——
one‐pot catalytic process gold nanoparticles supported on CeO2 are able to convert nitroaromatics into aromatic carbamates, thereby providing an alternative phosgene‐free route towards aromatic polyurethanes (see figure).
The present invention relates to a benzamide derivative of general formula I, a drug composition containing same and a use thereof as a drug, wherein the definitions of R1, Z and Q are as described in the description.
本发明涉及通式 I 的苯甲酰胺衍生物、含有该衍生物的药物组合物及其作为药物的用途,其中 R1、Z 和 Q 的定义如说明书所述。