Abstract:
The present invention relates to novel manganese complexes and their use, inter alia , for homogeneous catalysis in (1) the preparation of imine by dehydrogenative coupling of an alcohol and amine; (2) C-C coupling in Michael addition reaction using nitriles as Michael donors; (3) dehydrogenative coupling of alcohols to give esters and hydrogen gas (4) hydrogenation of esters to form alcohols (including hydrogenation of cyclic esters (lactones) or cyclic di-esters (di- lactones), or polyesters); (5) hydrogenation of amides (including cyclic dipeptides, lactams, diamide, polypeptides and polyamides) to alcohols and amines (or diamine); (6) hydrogenation of organic carbonates (including polycarbonates) to alcohols or hydrogenation of carbamates (including polycarbamates) or urea derivatives to alcohols and amines; (7) dehydrogenation of secondary alcohols to ketones; (8) amidation of esters (i.e., synthesis of amides from esters and amines); (9) acylation of alcohols using esters; (10) coupling of alcohols with water and a base to form carboxylic acids; and (11) preparation of amino acids or their salts by coupling of amino alcohols with water and a base. (12) preparation of amides (including formamides, cyclic dipeptides, diamide, lactams, polypeptides and polyamides) by dehydrogenative coupling of alcohols and amines; (13) preparation of imides from diols.
Abstract:
The present invention provides a system and method of storing hydrogen (H 2 ) and releasing it on demand, comprising and making use of diaminoalkanes and alcohols, or aminoalcohols as liquid-organic hydrogen carrier systems (LOHC). 2-aminoethanol (AE) or its N-methyl derivative 2-(methylamino)ethanol undergo catalytic dehydrogenation to form a cyclic dipeptide (glycine anhydride - GA) or its N,N-dimethyl derivative ( N,N- dimethyl GA) with release of hydrogen. Similarly, ethylenediamine (ED) and ethanol undergo catalytic dehydrogenation to form N,N '-diacetylethylenediamine (DAE) with release of hydrogen. Glycine anhydride (GA) or N,N -dimethyl-GA may be hydrogenated back to 2-aminoethanol (AE) or 2-(methylamino)ethanol, respectively, each of which functions as a hydrogen storage system. N,N'-diacetylethylenediamine (DAE) may be hydrogenated back to ED and ethanol, which functions as a hydrogen storage system. These reactions may be catalyzed by a variety of compounds or complexes, including Ruthenium complexes as described herein.
Abstract:
The present invention provides a process for preparing a metal carbene complex of formula (I): wherein M is a transition metal atom selected from the group consisting of ruthenium, rhodium, iron , cobalt, osmium and iridium; L denotes neutral donor ligands ligated to said metal, such groups being the same or different; X is an anionic ligand; R1 and R2 are each independently selected from the group consisting of hydrogen, substituted or unsubstituted C1-C20 alkyl, substituted or unsubstituted C2-C20 alkenyl, substituted or unsubstituted cycloalkyl, substituted or unsubstituted heterocycloalkyl, substituted or unsubstituted aryl, substituted or unsubstituted heteroaryl, substituted or unsubstituted vinyl, a is 2 or 3 and b is 1 or 2, such process comprising reacting a sulfur ylide of the formula Ar 2 S=CR 1 R 2 or its precursor with an appropriate metal complex comprising a transition metal atom selected from the group consisting of ruthenium, rhodium, iron, cobalt, osmium and iridium, said metal complex being also in dimeric form, at a temperature between +80 °C and -80 °C, in an inert solvent and under inert atmosphere.
Abstract translation:本发明提供了制备式(I)的金属卡宾络合物的方法:其中M是选自钌,铑,铁,钴,锇和铱的过渡金属原子; L表示与所述金属连接的中性供体配体,这些基团相同或不同; X是阴离子配体; R 1和R 2各自独立地选自氢,取代或未取代的C 1 -C 20烷基,取代或未取代的C 2 -C 20烯基,取代或未取代的环烷基,取代或未取代的杂环烷基,取代或未取代的芳基, 取代或未取代的乙烯基,a为2或3,b为1或2,该方法包括使式Ar> 2 R 2或其前体的硫叶立德与合适的金属络合物反应, 选自钌,铑,铁,钴,锇和铱的过渡金属原子,在惰性溶剂中,在+ 80℃至-80℃之间的温度下,所述金属络合物也是二聚体形式,和 在惰性气氛下。
Abstract:
The present invention provides a system, a process and a method of storing hydrogen (H 2 ) and releasing it on demand, comprising and making use of N -heterocycles as liquid organic hydrogen carriers (LOHCs).
Abstract:
The present invention provides novel ruthenium based catalysts, and a process for preparing amines, by reacting a primary alcohol and ammonia in the presence of such catalysts, to generate the amine and water. According to the process of the invention, primary alcohols react directly with ammonia to produce primary amines and water in high yields and high turnover numbers. This reaction is catalyzed by novel ruthenium complexes, which are preferably composed of quinolinyl or acridinyl based pincer ligands.
Abstract:
This invention is directed to a catalytic hydrogenation process for the preparation of l-(4- (benzyloxy)-3-(hydroxymethyl)phenyl)-2-(tert-butylamino)ethanol, which is an intermediate for the preparation of Salbutamol.
Abstract:
This invention is directed to iron-based complexes, and uses thereof for catalytic olefin metathesis reaction, including ring opening metathesis polymerization of olefins.
Abstract:
The present invention relates to the use of an acceptor-less dehydrogenation catalyst for an electrocatalytic oxidation of an alcohol to an ester or/and an acid under electrochemical conditions, the acceptor-less dehydrogenation catalyst being represented by formula (I).
Abstract:
This invention provides a reversible hydrogen loading and discharging system and a reversible method for loading and discharging hydrogen. The system and the methods of this invention comprise ethylene glycol as a liquid organic hydrogen carrier and at least one transition metal. By reacting ethylene glycol with at least one transition metal; at least one hydrogen molecule and at least one oligoester of ethylene glycol are formed (hydrogen releasing)·, and by reacting at least one oligoester of ethylene glycol with at least one transition metal and at least one hydrogen molecule, at least one ethylene glycol is formed (hydrogen loading).
Abstract:
The present invention relates to novel Ruthenium complexes of formulae A1-A4 and their use, inter alia, for (1) dehydrogenative coupling of alcohols to esters; (2) hydrogenation of esters to alcohols (including hydrogenation of cyclic esters (lactones) or cyclic di-esters (di-lactones), or polyesters); (3) preparing amides from alcohols and amines -(including the preparation of polyamides (e.g., polypeptides) by reacting dialcohols and diamines and/or polymerization of amino alcohols and/or forming cyclic dipeptides from p-aminoalcohols; (4) hydrogenation of amides (including cyclic dipeptides, polypeptides and polyamides) to alcohols andamines; (5) hydrogenation of organic carbonates (including polycarbonates) to alcohols or hydrogenation of carbamates (including polycarbamates) or urea derivatives to alcohols and amines; (6) dehydrogenation of secondary alcohols to ketones; (7) amidation of esters (i.e., synthesis of amides from esters and amines); (8) acylation of alcohols using esters; (9) coupling of alcohols with water and a base to form carboxylic acids; and (10) preparation of amino acids or their salts by coupling of amino alcohols with water and a base. The present, invention further relates to the use of certain known Ruthenium complexes for the preparation of amino acids or their salts from amino alcohols.