- Dehydrogenative cross-coupling of primary alcohols to form cross-esters catalyzed by a manganese pincer complex
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Base-metal-catalyzed dehydrogenative cross-coupling of primary alcohols to form cross-esters as major products, liberating hydrogen gas, is reported. The reaction is catalyzed by a pincer complex of earth-abundant manganese in the presence of catalytic base, without any hydrogen acceptor or oxidant. Mechanistic insight indicates that a dearomatized complex is the actual catalyst, and indeed this independently prepared dearomatized complex catalyzes the reaction under neutral conditions.
- Das, Uttam Kumar,Ben-David, Yehoshoa,Leitus, Gregory,Diskin-Posner, Yael,Milstein, David
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p. 479 - 484
(2019/01/11)
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- Aerobic oxidation of alcohols on Au/TiO2 catalyst: New insights on the role of active sites in the oxidation of primary and secondary alcohols
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A study of secondary, benzylic, and primary alcohols oxidation on a reference Au/TiO2 catalyst is reported. Reactions gave rise to ketones, aldehydes, or esters in good yields. The FT-IR results and catalytic tests data provide to elucidate the reaction mechanism and the specific role of the active sites on titania.
- Vindigni, Floriana,Dughera, Stefano,Armigliato, Francesco,Chiorino, Anna
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p. 391 - 403
(2016/02/16)
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- A Strained Disilane-Promoted Carboxylation of Organic Halides with CO2 under Transition-Metal-Free Conditions
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By using a strained four-membered ring disilane (3,4-benzo-1,1,2,2-tetraethyldisilacyclobutene) and CsF, a wide range of aryl, alkenyl, alkynyl, benzyl, allyl, and alkyl halides was successfully carboxylated under an ambient CO2 atmosphere (CO2 balloon) at room temperature within 2 h. In this carboxylation, a highly reactive silyl anion, which is generated from the disilane and CsF, is a key to facilitating the formation of a carbanion equivalent. The resulting anionic species can be trapped with CO2 to produce carboxylic acids with high efficiency.
- Mita, Tsuyoshi,Suga, Kenta,Sato, Kaori,Sato, Yoshihiro
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supporting information
p. 5276 - 5279
(2015/11/18)
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- Process for producing esters employing hydrolyzable catalysts
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A process for producing esters wherein a carboxylic acid is reacted with an alcohol in the presence of a hydrolyzable catalyst in an aqueous medium under mixing to produce a reaction mixture comprising an organic phase containing ester and an aqueous phase.
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Page/Page column 5
(2008/06/13)
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- Oxidation process of ethers
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An ether is oxidized with oxygen under an oxidation catalyst comprising an imide compound (such as N-hydroxyphthalimide) or the imide compound and a co-catalyst to produce the corresponding chain or cyclic ester or anhydride. The co-catalyst may be a transition metal compound. The above process provides a process for oxidizing an ether by oxygen efficiently to produce the corresponding oxide (such as an ester, an hydride) with high conversion and selectivity.
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- THERMAL ESTERIFICATION OF CARBOXYLIC ACIDS WITH ALCOHOLS
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Catalyst-free esterification of carboxylic acids with alcohols has been studied, and the optimal process conditions have been determined.
- Magerramov, M. N.
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p. 291 - 293
(2007/10/03)
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- BAEYER-VILLIGER OXIDATION WITH Me3SiOOSiMe3 UNDER ASSISTANCE OF SnCl4 OR BF3-OEt2.
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Treatment of ketones with bis(trimethylsilyl) peroxide and Lewis acid such as SnCl//4 or BF//3-OEt//2 in dichloromethane at room temperature affords esters in fair to excellent yields. Jasmine lactone is synthesized from 2- left bracket (Z)-pentenyl right bracket cyclopentanine by means of Me//3SiOOSiMe//3-BF//3-OEt//2 system without any protection of the carbon-carbon double bond. The oxidation of enol acetates of ketones to alpha -hydroxy (or alpha -acetoxy) ketones with Me//3SiOOSiMe//3-FeCl//3 system is also disclosed.
- Matsubara,Takai,Nozaki
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p. 2029 - 2032
(2007/10/02)
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