- Synthesis of oxygen- and sulfur-bridged dirhodium complexes and their use as catalysts in the chemoselective hydrogenation of alkenes
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Oxygen-bridged and sulfur-bridged rhodium homobimetallic complexes were synthesized as air-stable crystals by using 2,6-bis(phosphanylmethyl)phenolate and -thiophenolate as the ligands, respectively. The oxygen-bridged dirhodium complex has a symmetrical structure where the carbon atom at the ipso position, oxygen, and two rhodium atoms are located in the same plane. It is thermally stable compared to the sulfur-bridged dirhodium complex and shows catalytic activity for hydrogenation of alkenes with high chemoselectivity.
- Zhu, Chuan,Yukimura, Noriaki,Yamane, Motoki
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experimental part
p. 2098 - 2103
(2010/06/19)
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- Synthesis of carbonates and related compounds from carbon dioxide via methanesulfonyl carbonates
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Carbonate anions resulting from reaction of primary or secondary alcohols with carbon dioxide, when added to methanesulfonic anhydride in cooled acetonitrile solution, yield methanesulfonyl carbonates, a new class of synthetic intermediate. Base-mediated reaction of the methanesulfonyl carbonates with alcohols, thiols, and amines yields carbonates, thiocarbonates, and carbamates, respectively. Overall yields for the three steps vary from 19% to 42%.
- Bratt, Mark O.,Taylor, Paul C.
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p. 5439 - 5444
(2007/10/03)
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- Synthesis of mixed carbonates via a three-component coupling of alcohols, CO2, and alkyl halides in the presence of K2CO3 and tetrabutylammonium iodide
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Various mixed carbonates can be conveniently prepared in good yields using the corresponding alcohols, alkyl halides under CO2 atmosphere in the presence of potassium carbonate or sodium carbonate and tetrabutylammonium iodide.
- Shi, Min,Shen, Yu-Mei
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p. 386 - 393
(2007/10/03)
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