摘要:
Carboxylic acid anhydrides of the formula RCO--O--COR', e.g., acetic anhydride, are facilely prepared by reacting, in an essentially anhydrous, liquid phase containing an aprotic organic solvent, (i) a compound of the formula RX, (ii) a carboxylate of the formula (R'COO.sup.-).sub.n A.sup.n+, and (iii) carbon monoxide, said reaction being carried out in the presence of a catalytically effective amount of a salt of cobalt tetracarbonyl halide, at a temperature ranging from about 0.degree. to 200.degree. C. and under a pressure which is less than or equal to about 600 bars.
摘要:
Carboxylic acids having the structural formula R.sup.1 COOH, wherein R.sup.1 is a linear, branched or cyclic chain alkyl radical of from 1 to 6 carbon atoms or a phenyl-C.sub.n H.sub.2n -radical wherein 1.ltoreq.n.ltoreq.6, are prepared by carbonylating an alcohol having the formula R.sup.1 -OH with carbon monoxide in liquid phase, in the presence of a catalytically effective amount of nickel and an alkyl or acyl halide promoter therefor, at a temperature of at least about 120.degree. C. and under a total pressure of less than 200 bars, and said carbonylation being carried out in the presence of at least one lanthanide salt, and in an initial carboxylic acid reaction medium having the formula R.sup.2 -COOH, wherein R.sup.2 is defined as was R.sup.1 above, and further wherein R.sup.1 and R.sup.2 may be the same or different.
摘要翻译:具有结构式R 1 COOH的羧酸,其中R 1是具有1至6个碳原子的直链,支链或环状链烷基或苯基-C n H 2n - ,其中n 1 = n 6,是通过羰基化 具有式R 1 -OH的醇与一氧化碳在液相中,在催化有效量的镍和其烷基或酰卤促进剂存在下,在至少约120℃的温度和总压力 并且所述羰基化在至少一种镧系元素盐存在下进行,并且在具有式R 2 -COOH的初始羧酸反应介质中进行,其中R2定义为R 1,其中R 1和 R2可以相同或不同。
摘要:
Alkyl carboxylates of the formula:R--CO--O--CH.sub.2 R'are prepared by hydrocarbonylating a compound of the formula:R--CO--O--R'in the simultaneous presence, in the reaction medium, of cobalt, ruthenium, an alkyl iodide and an ionic iodide, the atomic ratio Co/Ru being less than or equal to 1, and the total amount of iodine-containing promoters present in the medium being such that I/Ru is greater than or equal to 5.
摘要:
Methyl acetate is carbonylated to acetic anhydride with carbon monoxide, in liquid phase, in an anhydrous reaction medium, in the presence of a catalytically effective amount of (i) nickel, (ii) methyl iodide, (iii) an alkali metal iodide, and (iv) a crown ether.
摘要:
Alkali or alkaline earth metal cobalttetracarbonylates well suited for catalyzing carbonylation reactions, e.g., the carbonylation of organic compounds comprising halomethyl functions, are facilely prepared by reacting a cobalt (II) compound with carbon monoxide in the presence of (i) an inorganic base which comprises an alkali or alkaline earth metal hydroxide or an alkali or alkaline earth metal bicarbonate and (ii) at least one sulfur compound having at least one sulfur atom, the oxidation state of which being no greater than +3, and in a reaction medium comprising water, an alcohol, an ether, or admixture of water and an alcohol or an ether.
摘要:
Carboxylic acids having the structural formula R.sup.1 COOH, wherein R.sup.1 is a linear, branched or cyclic chain alkyl radical of from 1 to 6 carbon atoms or a phenyl-C.sub.n H.sub.2n -radical wherein 1.ltoreq.n.ltoreq.6, are prepared by carbonylating an alcohol having the formula R.sup.1 -OH with carbon monoxide in liquid phase, in the presence of a catalytically effective amount of nickel and an alkyl or acyl halide promoter therefor, at a temperature of at least about 120.degree. C. and under a total pressure of less than 200 bars, and said carbonylation being carried out in the presence of at least one vanadium compound in which the vanadium is in an oxidation state of 4 or 5, and in an initial carboxylic acid reaction medium having the formula R.sup.2 -COOH, wherein R.sup.2 is defined as was R.sup.1 above, and further wherein R.sup.1 and R.sup.2 may be the same or different.
摘要翻译:具有结构式R 1 COOH的羧酸,其中R 1是具有1至6个碳原子的直链,支链或环状链烷基或苯基-C n H 2n - ,其中n 1 = n 6,是通过羰基化 具有式R 1 -OH的醇与一氧化碳在液相中,在催化有效量的镍和其烷基或酰卤促进剂存在下,在至少约120℃的温度和总压力 所述羰基化反应在至少一种钒化合物的存在下进行,其中钒处于4或5的氧化态,并且在具有式R2-COOH的初始羧酸反应介质中进行,其中 R2定义为上述R 1,并且其中R 1和R 2可以相同或不同。
摘要:
Alkyl carboxylates are hydrocarbonylated and/or carbonylated with carbon monoxide and hydrogen, in an aqueous medium, and in the presence of a catalytically effective amount of a catalyst system comprising (i) ruthenium, (ii) cobalt, (iii) at least one iodine-containing promoter, and (iv) chromium. The subject hydrocarbonylation/carbonylation is admirably well suited, e.g., for the preparation of acetaldehyde, ethanol, ethyl acetate and acetic acid, especially from a methyl carboxylate.
摘要:
The invention relates to a process for the preparation of acetic anhydride by carbonylation. In the process, carbon monoxide is reacted with methyl acetate in the liquid phase, in a carboxylic acid, in the presence of an effective amount of nickel, methyl iodide, an ionic iodide selected from the group consisting of quaternary ammonium iodides, quaternary phosphonium iodides, sodium iodide, potassium iodide and cesium iodide, and a co-catalyst selected from the group consisting of lithium salts and alkaline earth metal salts.
摘要:
The invention relates to a process for the preparation of acetic anhydride by carbonylation. In the process, carbon monoxide is reacted with methyl acetate in an anhydrous medium, in the liquid phase, in the presence of an effective amount of nickel, methyl iodide, a quaternary ammonium or quaternary phosphonium iodide and a lithium salt, the reaction medium initially containing acetic anhydride, if desired.
摘要:
Methyl acetate is carbonylated, advantageously to acetic anhydride, in a homogeneous liquid phase, in a virtually anhydrous reaction medium, in the presence of: (a) a cobalt source, (b) a ruthenium source, (c) an ionic iodide of the formula: A.sup.m+ I.sub.m.sup.- in which A.sup.m+ is a nitrogen group quaternary onium cation, an alkali metal or alkaline earth metal cation, or a lanthanide or actinide group metal cation, (c') if appropriate, a carboxylate of the formula: A'.sup.n+ (OCOR).sub.n.sup.-, in which n is 1 or 2 and A'.sup.n+ is defined as was A.sup.m+, with A'.sup.n+ and A.sup.m+ either being the same or different, and R is an alkyl, aralkyl or aryl radical having a maximum of 8 carbon atoms, and (d) hydrogen, the total amount of halogen compounds present in the carbonylation reaction medium (expressed in gram atoms of halogen and designated by X.sub.T) being such that the atomic ratio X.sub.T /(m.A.sup.m+ +n.A'.sup.n+) is less than or equal to 1.
摘要翻译:在(a)钴源,(b)钌源的存在下,在几乎无水的反应介质中,乙酸甲酯在均相液相中有利地羰基化,有利地为乙酸酐,(c) 式:Am + Im-其中Am +是氮基季鎓阳离子,碱金属或碱土金属阳离子,或镧系元素或锕系金属阳离子,(c')如果合适,下式的羧酸酯:A' n +(OCOR)n-,其中n为1或2,A'n +定义为Am +,其中A'n +和Am +相同或不同,R为具有最大值的烷基,芳烷基或芳基 8个碳原子和(d)氢,存在于羰基化反应介质中的卤素化合物的总量(用卤素的克原子表示,由XT表示)使原子比XT /(m.Am ++ n .A'n +)小于或等于1。