Aminophosphine ligands R2P(CH2)nNH2 and ruthenium hydrogenation catalysts RuCl2(R2P(CH2)nNH2)2
作者:Wenli Jia、Xuanhua Chen、Rongwei Guo、Christine Sui-Seng、Dino Amoroso、Alan J. Lough、Kamaluddin Abdur-Rashid
DOI:10.1039/b911459a
日期:——
The aminophosphine ligands R2P(CH2)2NH2 and R2P(CH2)3NH2 (R = Ph, iPr, tBu) were isolated in good to excellent yields from the reaction of LiPR2 with Cl(CH2)2N(TMS)2 and Cl(CH2)3N(TMS)2, respectively, followed by hydrolysis. This approach allows fine tuning of the ligands' stereoelectronic properties through the variation of the substituents on the phosphine. The aminophosphine ligands were used to prepare the ruthenium complexes RuCl2(R2P(CH2)2NH2)2 and RuCl2(R2P(CH2)3NH2)2 by reacting a 2:1 mixture of the respective ligand and [RuCl2(cod)]n in an appropriate solvent. The resulting complexes were found to be excellent catalysts for the hydrogenation of ketones and imines.
[EN] CATALYTIC CONVERSION OF CARBON DIOXIDE TO METHANOL<br/>[FR] CONVERSION CATALYTIQUE DU DIOXYDE DE CARBONE EN MÉTHANOL
申请人:KAMAL PHARMACHEM INC
公开号:WO2019193483A1
公开(公告)日:2019-10-10
The present disclosure relates to a new catalytic process for the production of methanol from carbon dioxide, comprising: (1) the conversion of carbon dioxide and hydrogen to formic acid or formate salts; (2) converting the formic acid or formate salts to diformate esters of diols; (3) hydrogenating the diformate esters to methanol and diols. The diols produced from the hydrogenation reaction can be recovered and re-used to prepare the diformate esters.
The present disclosure relates to a method for preparing a metal catalyst comprising at least one ligand that is coordinated to the metal through at least one phosphorous (P) atom and at least one nitrogen (N) atom, the method comprising reacting a metal pre-cursor complex with an acid ad salt of an aminophosphine, diaminophosphine, aminodiphosphine or diaminodiphosphine, in the presence of a base.
[EN] METHOD FOR THE PREPARATION OF CIS-4-TERT-BUTYLCYCLOHEXANOL<br/>[FR] PROCÉDÉ DE PRÉPARATION DU CIS-4-TERT.-BUTYLCYCLOHEXANOL
申请人:KANATA CHEMICAL TECHNOLOGIES I
公开号:WO2009006734A1
公开(公告)日:2009-01-15
The present disclosure relates to a method for the stereoselective production of cis-4-tertbutylcyclohexanol comprising contacting 4-tert-butylcyclohexanone with hydrogen gas, a catalyst comprising a ruthenium-aminophosphine complex and a base, wherein the complex is of the formula RuX2 (PNH2)a(P2)b (I), wherein X is anionic ligand, (PNH2) represents an aminophosphine ligand of the formula (II) R1R2P-L- NH2 and (P2) represents a diphosphine ligand of the formula (III) R3R4P-L-PR5R6.