摘要:
The present invention relates to organophosphorus compounds belonging to the phosphinite-phosphite family, to catalytic systems including a metal element forming a complex with said phosphinite-phosphite compounds, and to hydrocyanation methods implemented in the presence of such catalytic systems.
摘要:
Die Erfindung betrifft Bismutperfluoralkylphosphinate als Lewis-Säure-Katalysatoren, die Verbindungen sowie deren Verfahren zur Herstellung. Ar x Bi[OP(O)(R f ) 2 ] 3-x (la), Ar 3 Bi[OP(O)(R f ) 2 ] 2 (Ib).
摘要:
Catalysts of general formula (I): [AaBbOx]p [CcDdFeeCofEiFjOy]q, in which the variables have the following meanings: A = bismuth, tellurium, antimony, tin and/or copper; B = molybdenum and/or tungsten; C = an alkaline metal, thallium and/or samarium; D = an alkaline earth metal, nickel, copper, cobalt, manganese, zinc, tin, cerium, chromium, cadmium, molybdenum, bismuth and/or mercury; E = phosphorus, arsenic, boron and/or antimony; F = a rare-earth metal, vanadium and/or uranium; a = 0.01 to 8; b = 0.1 to 30; c = 0 to 4; d = 0 to 20; e = 0 to 20; f = 0 to 20; i = 0 to 6; j = 0 to 15; x and y are figures determined by the valency and frequency of the elements in (I) differing from oxygen and p and q are figures, the ratio p/q of which lies in the range from 0.001 to 0.099, and a process for producing said catalysts, their use for the ammono-oxidation, oxidation or dehydrogenation of ethylenically unsaturated compounds and a process for ammono-oxidation, oxidation or oxidative dehydrogenation of ethylenically unsaturated compounds in the presence of the catalyst of the invention.
摘要:
A process to isolate a compound of Formula (2a) or a salt or solvate thereof, comprising a) reacting a mixture of diastereoisomers of Formulae (2a, 2b) with a basic heterocyclic-aldehyde compound and an optically active amine in the presence of a base; and b) separating the compound of Formula (2a) from the product of step a) by acid extraction. The compound of Formula (2a) may be produced with an enantiomeric excess of 98%. Compounds of Formula (2a) are useful intermediates in a process to prepare a bicyclic γ - amino tetrazole derivative of Formula (I) which finds utility in treating neuropathic pain and disorders of the central nervous system.
摘要:
Methods of synthesizing 2-(1' H -indole-3'-carbonyl)-thiazole-4-carboxylic acid methyl ester (ITE) and structural analogs thereof. The methods include condensation reactions or condensation and oxidation reactions to form the thiazoline or thiazole moiety of ITE or its structural analogs.
摘要:
The present invention relates to titanium catalysts for asymmetric synthesis reactions produced by bringing a reaction mixture obtained by contacting water and a titanium alkoxide into contact with an optically active ligand represented by the general formula (a), wherein R 1, R 2 , R 3 , and R 4 are independently a hydrogen atom, an alkyl group, or the like, and A* represents a group with two or more carbon atoms having an asymmetric carbon atom or axial asymmetry. The invention further relates to a process for asymmetric cyanation of imines, wherein the process comprises reacting an imine with a cyanating agent in the presence of the titanium catalyst.
摘要翻译:本发明涉及用于不对称合成反应的钛催化剂,其通过使水与烷氧基钛接触而获得的反应混合物与由通式(a)表示的光学活性配体接触而制备,其中R 1, R 2,R 3,R 4和R 4独立地为氢原子,烷基等,A *表示 具有两个以上具有不对称碳原子或轴向不对称的碳原子的基团。 本发明还涉及亚胺不对称氰化方法,其中该方法包括在钛催化剂存在下使亚胺与氰化剂反应。
摘要:
A process for the ammoxidation of a saturated or unsaturated or mixture of saturated and unsaturated hydrocarbon to produce an unsaturated nitrile, said process comprising contacting the saturated or unsaturated or mixture of saturated and unsaturated hydrocarbon with ammonia and an oxygen-containing gas in the presence of a catalyst composition comprising molybdenum, vanadium, antimony, niobium, tellurium, optionally at least one element select from the group consisting of titanium, tin, germanium, zirconium, hafnium, and optionally at least one lanthanide selected from the group consisting of lanthanum, cerium, praseodymium, neodymium, samarium, europium, gadolinium, dysprosium, holmium, erbium, thulium, ytterbium and lutetium. Such catalysts are characterized by very low levels of tellurium in the composition. Such catalyst compositions are effective for the gas-phase conversion of propane to acrylonitrile and isobutane to methacrylonitrile (via ammoxidation).
摘要:
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.
摘要:
La présente invention concerne des composés organophosphorés appartenant à la famille des phosphinites-phosphites, les systèmes catalytiques comprenant un élément métallique formant un complexe avec ces composés phosphinites-phosphites et les procédés d'hydrocyanation mis en œuvre en présence de tels systèmes catalytiques.
摘要:
The present invention relates to a method of producing an optically active cyanohydrin derivative, which comprises reacting an aldehyde or an asymmetrical ketone with a cyanating agent in the presence of a Lewis base and a titanium compound produced from a partial hydrolysate of titanium tetraalkoxide and an optically active ligand represented by formula (II) or a titanium oxoalkoxide compound represented by formula (I) [Ti x O y ](OR 1 ) 4x-2y , and an optically active ligand represented by formula (II), wherein R 1 is an optionally substituted alkyl group or an optionally substituted aryl group; x is an integer of not less than 2; y is an integer of not less than 1; and y/x satisfies 0.1 2 , R 3 and R 4 are independently a hydrogen atom, an alkyl group, an alkenyl group, an aryl group, an aromatic heterocyclic group, an acyl group, an alkoxycarbonyl group or an aryloxycarbonyl group, each of which may be optionally substituent, two or more of R 2 , R 3 and R 4 may be linked together to form a ring, and the ring may have a substituent; and A represents a hydrocarbon containing group with three or more carbon atoms having an asymmetric carbon atom or axial asymmetry.
摘要翻译:本发明涉及一种制备光学活性羟腈衍生物的方法,其包括在路易斯碱和由四烷氧基钛的部分水解产物和光学上产生的钛化合物存在下使醛或不对称酮与氰化剂反应 由式(II)表示的活性配体或由式(I)表示的氧钛氧烷化合物[Ti x O y O y](OR 1) 4x-2y和由式(II)表示的光学活性配体,其中R 1是任选取代的烷基或任选取代的芳基; x是不小于2的整数; y是不小于1的整数; y / x满足0.1