- Site-selective oxidation of unactivated C sp 3-H bonds with hypervalent iodine(III) reagents
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By design: The site-selective oxidation of unactivated secondary C sp 3-H bonds was accomplished with hypervalent iodine(III) reagents and tert-butyl hydroperoxide (see scheme). The preparation and derivatization of the hypervalent iodine(III) reagent are simple, thus allowing the rational design of these reagents to optimize the site selectivity of the oxidation. Copyright
- Moteki, Shin A.,Usui, Asuka,Zhang, Tiexin,Solorio Alvarado, Cesar R.,Maruoka, Keiji
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supporting information
p. 8657 - 8660
(2013/09/12)
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- Rhodium Zeolites as Bifunctional Catalysts for the Synthesis of 2-Methylhexan-3-one and Heptan-4-one from Propylene, Carbon Monoxide, and Hydrogen
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RhNaX and RhNaY zeolites behave as bifunctional catalysts for the synthesis of C7 ketones from C3H6, CO, and H2 at atmospheric pressure and 120-150 deg C.
- Rode, Edward,Davis, Mark E.,Hanson, Brian E.
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p. 716 - 717
(2007/10/02)
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- Hydroformylation of Propene with Zeolite-supported Rhodium Phosphine Complexes
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Rhodium phosphine complexes synthesized in situ on zeolite NaY are active for propene hydroformylation at 150 deg C and 1 atm; the catalysts are not stable yet show an enhancement in linear vs. branched products with an increased production of alcohols compared to rhodium zeolites without phosphines.
- Rode, Edward,Davis, Mark E.,Hanson, Brian E.
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p. 1477 - 1478
(2007/10/02)
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- New Catalyst for the Synthesis of Dialkyl Ketones from Olefins, Carbon Monoxide, and Hydrogen
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Dialkyl ketones are formed in mild conditions (30 - 70 deg C, 1 atm) from H2 + CO + C2H4 or C3H6 in aqueous trifluoroacetic acid solutions of a PdII triphenylphosphine complex.
- Zudin, Vladimir N.,Il'inich, Galina N.,Likholobov, Vladimir A.,Yermakov, Yurii I.
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p. 545 - 546
(2007/10/02)
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- IRON CATALYZED CROSS-COUPLING REACTIONS OF ACYL CHLORIDES WITH GRIGNARD REAGENTS. A MILD, GENERAL, AND CONVENIENT SYNTHESIS OF ALIPHATIC AND AROMATIC KETONES.
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Acyl chlorides couple with Grignard reagents at room temperature in the presence of catalytic amounts of tris(acetylacetonate)iron(III), Fe(acac)3.The reaction is general with respect to both reactants and provides a very mild and convenient method for the synthesis of aliphatic and aromatic ketones.
- Fiandanese, V.,Marchese, G.,Martina, V.,Ronzini, L.
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p. 4805 - 4808
(2007/10/02)
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- GENERAL RELATIONSHIPS IN THE OPENING OF THE OXIRANE RING DURING CLEAVAGE OF GLYCIDIC ACIDS
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By investigation of the decarboxylation of 2,3-epoxy derivatives of acids with various structures it was shown that contrary to the existing theory about the essential opening of the β (C-O) bond in the oxirane ring there are many structural types of 2,3-epoxypropionic acids, in which opening of the α (C-O) bond in the oxirane ring occurs during decarboxylation.It was also shown that these two possible reaction paths can also arise during the decarboxylation of one 2,3-epoxypropionic acid.On the basis of the obtained data a general relationship is developed for theopening of the oxirane ring during the decarboxylation of 2,3-epoxypropionic acids with any structure, and this makes it possible to predict the structure of the obtained carbonyl compound.
- Kuroyan, R. A.,Markosyan, A. I.,Engoyan, A. P.,Vartanyan, S. A.
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p. 1709 - 1714
(2007/10/02)
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- Applications of Homogeneous Water-gas-shift Reaction. I. Further Studies of the Hydroformylation of Propene with CO and H2O
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Polar ether solutions prepared in situ from Co2(CO)8 and 1,2-bis(diphenylphosphino)ethane (diphos) are active catalysts for the hydroformylation of propene with CO and H2O.Under the hydroformylation conditions employed, butyl(C4) or isobutyl alcohols, butyric(C4) acids, and dipropyl ketones were found to be formed as by-products.A pronounced formation of C4 alcohols was observed as the reaction temperature was increased; in fact, the catalyst solutions described above actively reduce butyraldehyde to butyl alcohol.The effects of the CO pressure and of the propene concentration on the formation of C4 aldehydes are also examined.It turns out that the water molecule as well as Co2(CO)8 and diphos are essential for the formation of catalytic intermediates, which are themselves responsible for the hydroformylation activity.
- Murata, Kazuhisa,Matsuda, Akio
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p. 245 - 248
(2007/10/02)
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- RHODIUM CATALYZED CARBONYLATION REACTIONS OF CYCLOPROPANES
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Cyclopropane was carbonylated by 2 under carbon monoxide pressure to give cyclobutanone, dipropyl ketone, propyl isopropyl ketone, and 2- or 3-methylcyclohexanone.Some other cyclopropane derivatives were also examined.Norcarane gave a small amount of bicycloocta-7-one, though phenylcyclopropane did not give any carbonylation products.The formation of polyketone was efficient in the case of methylenecyclopropane.
- Hidai, Masanobu,Orisaku, Masami,Uchida, Yasuzo
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p. 753 - 754
(2007/10/02)
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- SELECTIVE FORMATION OF KETONES FROM PROPENE, CO AND H2O : COBALT BASED CATALYTIC HYDROCARBONYLATION
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A complex prepared in situ from Co2(CO)8 and 1,2-bis(diphenylphosphino)ethane (diphos) was found to be an effective catalyst for selective hydrocarbonylation of propene to give dipropyl ketones.
- Murata, Kazuhisa,Matsuda, Akio
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- Cardioglycoside derivatives of the strophanthidin type, a process for their manufacture and medicinal preparations containing these compounds
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Cyclic acetals or ketals of cardioglycosides derived from k-strophanthidin or strophanthidol are more readily absorbed by the stomach and intestine than the parent cardioglycoside. The acetals are produced by reaction of the parent cardioglycoside, e.g., strophanthidindigitoxide, with an aldehyde or ketone, or the corresponding acetal or ketal, in the presence of an acid condensation catalyst, to produce the k-strophanthidin derivative optionally followed by reduction to the strophanthidiol derivative.
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