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'Acetic Acid' in keywords
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1Author    Ekkehard Lindner, Jens-Peter Reber, Peter WegnerRequires cookie*
 Title    Neuartige basische Liganden für die homogenkatalytische Methanolcarbonylierung, XIX [1] Cobalt-katalysierte Carbonylierung von Methanol zu Essigsäure Novel Basic Ligands for the Homogeneous Catalytic Carbonylation of Methanol, XIX [1] Cobalt Catalyzed Carbonylation of Methanol to Acetic Acid  
 Abstract    The bi-to quadridentate 1,3-dioxolane and 1,4-dioxane phosphane ligands Ph"P(CH 2 C,H 5 0 2) 3 _" (1, 2). PhP(CH 2 C 4 H 7 0 2) 2 (3), and [-CH 2 P(Ph)CH 2 C 4 H 7 0 2 ] 2 (4) have been investigated with regard to their efficiency in the carbonylation of methanol to acetic acid using cobalt as a component of the catalyst. While 1, 2 are unstable towards acetic hydrolysis. 3 and 4 lead to methanol conversions of >95%, and selectivities to methyl acetate and acetic acid of 33%, and 60%, respectively. 
  Reference    Z. Naturforsch. 43b, 1268—1270 (1988); eingegangen am 6. Juni 1988 
  Published    1988 
  Keywords    Methanol Carbonylation, Acetic Acid, (Ether-Phosphane) Ligands 
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 TEI-XML for    default:Reihe_B/43/ZNB-1988-43b-1268.pdf 
 Identifier    ZNB-1988-43b-1268 
 Volume    43 
2Author    Nien Man, Henryk Schuchmann, Zegota, Clemens Von SonntagRequires cookie*
 Title    Acetate Peroxyl Radicals, 0 2 CH 2 C0;: A Study on the y-Radiolysis and Pulse Radiolysis of Acetate in Oxygenated Aqueous Solutions  
 Abstract    Hydroxyl radicals from the radiolysis of N 2 0/0 2 (4:1 v/v)-saturated aqueous solutions have been reacted with acetate ions (1CT 2 M). As measured by pulse radiolysis, the resulting "CH 2 C0 2 radicals react with oxygen yielding the corresponding peroxyl radicals, 0 2 CH 2 C0 2 (k = 1.7 x 10 9 M-V 1). These peroxyl radicals decay bimolecularly (2k = 1.5 x 10 8 M _1 s _1) giving rise to the products (G values in brackets) glyoxylic acid (2.7), glycolic acid (0.7), formaldehyde (1.4), carbon dioxide (1.4), organic hydroperoxide (0.7) and hydrogen peroxide (2.5). Oxygen is consumed with a G value of 5.3. Aided by data from pulse radiolysis it is concluded that the intermediate tetroxide formed upon the bimolecular decay breaks down by various routes to yield: (i) hydrogen peroxide and two molecules of glyoxylic acid (ca. 27%); (ii) oxygen, glycolic acid and glyoxylic acid (ca. 25%); (iii) hydrogen peroxide and two molecules of formaldehyde, carbon dioxide and OH~ (25%). These reactions do not involve free radicals as intermediates; (iv) There is some 0 2 (G = 0.5) formed in the decay of the peroxyl radicals, which is attributed to the decay of intermediate oxyl radicals (tetroxide —* • 0 2 + 2 0CH 2 C0 2) by 1,2-H shift, oxygen addition and H0 2 elimination, a reaction sequence which gives rise to glyoxylic acid (10%); (v) The reaction of 0 2 with the organic peroxyl radical yields the hydroperoxide (13%). Reaction (iii) is a novel peroxyl radical reaction. 
  Reference    Z. Naturforsch. 40b, 215—221 (1985); received October 24 1984 
  Published    1985 
  Keywords    Acetic Acid, Peroxyl Radicals, Oxyl Radicals, Superoxide Radicals, Pulse Radiolysis 
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 TEI-XML for    default:Reihe_B/40/ZNB-1985-40b-0215.pdf 
 Identifier    ZNB-1985-40b-0215 
 Volume    40 
3Author    Antje Albert, Dietrich MootzRequires cookie*
 Title    8-Krone-6 und kleine Carbonsäuren. Bildung und Struktur binärer Addukte mit Ameisen-und Essigsäure sowie ternärer mit Essigsäure und Wasser 18-Crown-6 and Small Carboxylic Acids. Formation and Structure of Binary Adducts with Formic and Acetic Acid, as well as Ternary Ones with Acetic Acid and Water  
 Abstract    The melting diagrams of the binary systems 18-crown-6/formic acid and 18-crown-6/acetic acid have been set up and the crystal structures of the adducts 18C6 • 2 HCOOH (1, space group P 2 !/c with Z = 2 formula units per unit cell) and 18C6 • 2 CH 3COOH (2, C2/m, Z = 2) determined. Furthermore three ternary phases, 18C6 • CH3COOH • H20 (3, P2!/c, Z = 4) and dimorphic 18C6 • 2 C H 3COOH • 4 H 20 (high temperature form 4, P2,/n, Z = 2; low temperature form 5, P2|/n, Z = 2) have been characterized in the same way. In each structure the crown ether molecule has the (pseudo) D3d conformation common for many of its complexes. Various aspects of the intermolecular hydrogen bonding are described. 
  Reference    Z. Naturforsch. 53b, 242—248 (1998); eingegangen am 29. Oktober 1997 
  Published    1998 
  Keywords    Acetic Acid, Crown Ether, Formic Acid, Hydrate, Melting Diagram 
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 TEI-XML for    default:Reihe_B/53/ZNB-1998-53b-0242.pdf 
 Identifier    ZNB-1998-53b-0242 
 Volume    53 
4Author    A. Kondoh, T. OiRequires cookie*
 Title    Interaction of Alkaline Earth Metal Ions with Acetic and Lactic Acid in Aqueous Solutions Studied by 13 C NMR Spectroscopy  
 Abstract    Interaction of alkaline earth metal (magnesium, calcium, strontium and barium) ions with acetic and lactic acid in aqueous media was investigated by 13 C NMR spectroscopy. In the acetate systems, signals whose chemical shifts were the averages of those of the free and bound acetate ions were observed. Downfield shifts of the carboxylate carbon signals with increasing metal ion concentration indicated that the acetate ion acted as a monodentate ligand coordinating to the metal ion using the carboxylate group. The metal ion concentration dependence of the peak positions of the methine and carboxylate carbon signals of the lactate ion in the lactate systems suggested that the lactate ion coordinated to a metal ion using the carboxylate and hydroxyl groups. Unique upfield shifts upon complexation in the magnesium lactate systems suggested that the lactate ion coordinated to the magnesium ion from outside the primary hydration sphere. The present results were consistent with the isotope effects of the alkaline earth metals observed in cation exchange chromatography. 
  Reference    Z. Naturforsch. 52a, 351—357 (1997); received December 4 1996 
  Published    1997 
  Keywords    13 C NMR, Alkaline Earth Metals, Acetic Acid, Lactic Acid, Isotope Effects 
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 TEI-XML for    default:Reihe_A/52/ZNA-1997-52a-0351.pdf 
 Identifier    ZNA-1997-52a-0351 
 Volume    52