- Catalytic Systems Based on Magnesium and Zinc Compounds in the Oxidation Reactions of Alkylarenes and the Decomposition Reactions of the Corresponding Hydroperoxides
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The oxidation of aromatic hydrocarbons in the presence of magnesium and zinc 2-ethylhexanoates and a mixed catalyst based on these compounds is studied. It is shown that magnesium and zinc carboxylates are active catalytic systems which catalyze the decomposition of hydroperoxides representing the primary alkylarene oxidation products alongside with activation of oxygen.
- Kharlampidi, Kh. E.,Nurullina,Batyrshin,Usmanova, Yu. Kh.
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- Biocompatible Catalysts for Lactide Polymerization - Catalyst Activity, Racemization Effect, and Optimization of the Polymerization Based on Design of Experiments
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An original synthesis of Ca, Mg, and Zn 2-ethylhexanoate (octoate) obtained by reaction between metallic powder with 2-ethylhexanoic acid was achieved. The activities of obtaining biocompatible catalysts of lactide polymerization were tested. The most act
- Gadomska-Gajadhur, Agnieszka,Ru?kowski, Pawe?
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- Lubricating composition containing metal carboxylate
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The invention relates to a lubricating composition comprising (a) at least 0.05 wt % of a non-aromatic metal carboxylate, wherein the metal carboxylate is derived from a branched carboxylic acid, and (b) an oil of lubricating viscosity. The invention further provides for the use of the lubricating composition for lubricating a limited slip differential.
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- ZINC OXIDE-CERIUM OXIDE COMPOSITE PARTICLES
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Composite particles useful for absorbing in the UV-A and UV-B regions contain a zinc oxide matrix and cerium oxide domains, wherein the domains are located in and on the matrix, wherein a fraction of zinc oxide is 80 to 98% by weight and a fraction of cerium oxide is 2 to 20% by weight, in each case based on the composite particles, and wherein a BET surface area of said composite particles is from 5 to 100 m2/g.
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- Ionic liquids
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Low melting point organic liquid compounds with high boiling points are prepared by a preferred process having the J+xQy(R—COO?)x-y where x is 1 to 8, preferably 1-3, y is 0 to x?1, where R—COO? is an anion selected from the group consisting of 2-ethyl hexanoate, pivalate, neodecanoate, and mixtures thereof, Q is another anion or mixture of other anions, and J+x is a cation selected from cations of Groups IA, IIA, IB, IIB, IIIB, IVB, VB, VIB, VIIB, VIII and lanthanide metals, cations selected from cations of B, Si, Ge, As, Sb, Te and Po metalloids, an ammonium cation derived from ammonia or an organic amine, an organic phosphonium cation, and mixtures thereof the organic liquid compounds being substantially free of volatile organic compounds. These compounds, as liquids, are useful as low volatile organic solvents, e.g., solvents in which a variety of chemical reactions may be carried out.
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Page/Page column 3-4
(2008/06/13)
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- Influence of the spatial structure of the alkyl chain on the composition of the product of the direct neutralization reaction between aliphatic carboxylic acids and zinc hydroxide
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A study was launched to clarify the influence of the spatial structure of the alkyl chain on the products of the direct neutralization reactions between zinc hydroxide and several non-cyclic saturated carboxylic acids in the presence of an excess of either the carboxylic acid or zinc hydroxide. The species formed were identified on the basis of their FT-IR spectra in the mid-IR region. Straight-chain acids produced the corresponding zinc bis-carboxylates with polymeric sheet structure under all circumstances. The species present in the products of the branched-chain carboxylic acids depended strongly on the nature of the component in excess and the bulk of the alkyl group. Besides the starting materials the reaction mixtures contained two carboxylate species in various ratios. One of them was the zinc bis-carboxylate of the branched-chain carboxylic acid, characterized by an additional νC=O band at around 1630 cm-1, above the usual two strong carboxylate stretching bands. The other species was the corresponding complex Zn4O(RCOO)6. The conditions of formation of these three forms of zinc carboxylates were formulated on the basis of the decreasing possibility of interaction between the neighbouring alkyl chains to form a polyethylene subcell in the sequence of: Zn(RCOO)2 (polymeric sheet) > Zn(RCOO)2 (intermediate form) > Zn4O(RCOO)6 (tetranuclear complex).
- Dreveni,Berkesi,Andor,Mink
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- Preparation and properties of tetrazinc μ4-oxohaxa-μ-carboxylayes (basic zinc carboxylates
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The compounds (RCO2)6Zn4O have not been widely reported in the literature, and in order to examine their little-known chemistry, a number of them have been synthesised by several methods.The simplest method of preparation, using the carboxylic acid and zinc oxide, was found to be restricted to brached chain acids.The reaction of these basic salts with primary and secondary amines led to a breakdown of their structures, with the formation of the amine complexes of the neutral carboxylates.
- Gordon, Rhianydd M.,Silver, Howard B.
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p. 1218 - 1221
(2007/10/02)
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