- Gold-Catalyzed Direct C(sp3)?H Acetoxylation of Saturated Hydrocarbons
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In this communication we report our studies towards the development of a gold-catalyzed direct acetoxylation of C(sp3)?H bonds. We achieve this through the use of the hypervalent iodine reagent PhI(OAc)2 in combination with a simple gold salt (HAuBr4) as the catalyst. Through a comparison of the reactivities of cyclooctane and adamantane we judge the reaction to proceed via hydride transfer. This is further substantiated through computational studies of the relative energies for the anions, radicals and cations derived from C?H bond cleavage of cyclooctane and adamantane relevant to the C?H cleaving step.
- Jo, Tae Geun,Klein, Johannes E. M. N.
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- Synthesis and characterization of ionic liquid immobilized on magnetic nanoparticles: A recyclable heterogeneous organocatalyst for the acetylation of alcohols
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Herein, we describe a simple and efficient procedure for the preparation of 3-((3-(trisilyloxy)propyl)propionamide)-1-methylimidazolium chloride ionic liquid supported on magnetic nanoparticle (TPPA-IL-Fe3O4). The structure of this magnetic ionic liquid is fully characterized by FT-IR, TGA, XRD, VSM, SEM, EDX and DLS techniques. TPPA-IL-Fe3O4 is employed as a catalyst for the acetylation of alcohols with acetic anhydride under mild and heterogeneous conditions at room temperature with good to excellent yields. The magnetic catalyst could be readily separate from the reaction media by simple magnetic decantation, and reused several times without significant loss of its catalytic activity.
- Ghorbani-Choghamarani, Arash,Norouzi, Masoomeh
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p. 832 - 840
(2015/11/16)
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- Process for producing oxygen-bearing compound
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Provided is a process for industrially advantageously producing an oxygen-bearing compound (e.g., an alcohol, a diol, a polyol, or a ketone) through oxidation of an alkane or an alcohol, which process requires no treatment for separation/removal of a catalyst and causes no equipment corrosion. Specifically, there are provided a process for producing an oxygen-bearing compound, including oxidizing an alkane in the presence of a catalyst containing at least one element selected from among transition metal elements belonging to Groups 5 and 8 to 10 of the periodic table, wherein the oxygen-bearing compound is an alcohol, a diol, a polyol, or a ketone; and a process for producing an oxygen-bearing compound, including oxidizing an alcohol in the presence of a catalyst containing at least one element selected from among transition metal elements belonging to Groups 5 and 8 to 10 of the periodic table, wherein the oxygen-bearing compound is a diol, a polyol, or a ketone.
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Page/Page column 5-7
(2008/06/13)
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- Meerwein-Ponndorf-Verley-type reductive acetylation of carbonyl compounds to acetates by lanthanide complexes in the presence of isopropenyl acetate
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Meerwein-Ponndorf-Verley-type reductive acetylation of carbonyl compounds to acetates was successfully carried out in the presence of isopropenyl acetate under the influence of a catalytic amount of Ln(O(i)Pr)3 at room temperature. Various carbonyl compounds were converted into the corresponding acetates in fair to good yields. (C) 2000 Elsevier Science Ltd.
- Nakano, Yasushi,Sakaguchi, Satoshi,Ishii, Yasutaka
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p. 1565 - 1569
(2007/10/03)
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- Induced Homolysis of Dimethyldioxirane by Alkanes and Alkyl Radicals in Oxidation Processes. The Dramatic Role of Molecular Oxygen and Radical Inhibitors
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The oxidation of alkanes by dimethyldioxirane is dramatically affected by the presence of molecular oxygen and radical inhibitors, supporting the hypothesis of a free-radical mechanism for these extraordinarily selective reactions; the factors affecting the free-radical selectivity are suggested.
- Bravo, Anna,Fontana, Francesca,Fronza, Giovanni,Mele, Andrea,Minisci, Francesco
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p. 1573 - 1574
(2007/10/02)
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