HCo(CO)4 AS AN ACID CATALYST IN VINYL ETHER REACTIONS
At room conditions in the presence of alcohols, HCo(CO)4 instead of being consumed by vinyl ethers, functions as an acid catalyst for acetal formation.
Freudenberger, John H.,Matsui, Yasushi,Orchin, Milton
THE HOMOLOGATION OF METHANOL. THE MODIFICATION OF COBALT CATALYST BY DIPHOSPHINES
Cobalt iodide modified by α,ω-bis(diphenylphosphino)alkane (PCnP; n=1-6) efficiently catalyzes the homologation of methanol to ethanol.The ethanol selectivity as high as 89percent was achieved by using PC6P as the ligand.
Process and catalysts for the oxidation of methanol and/or ethanol
A process for oxidation of methanol, ethanol, or a mixture of methanol and ethanol comprising contacting the methanol and/or ethanol with an oxygen-containing gas and a supported catalyst comprising one or more platinum group oxides. The process conditions and/or catalyst may be selected to as to selectively produce methyl formate from methanol or diethoxyethane from ethanol. The invention also includes certain novel supported platinum group metal oxide catalysts. Preferred catalysts include one or more ruthenium oxides.
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Page/Page column 8
(2008/06/13)
Kinetische Untersuchungen zur Methanolyse von Acetalen
It has been shown that the acid-catalyzed methanolysis of the diethylacetales RCH(OEt)2 of acetaldehyde (R=CH3), propionaldehyde (R = C2H5), butyraldehyde (R = C3H7) and caprylaldehyde (R = C7H15) at temperatures between 283 and 318 K proceeds as a consecutive reaction involving a reversible second step.The pseudo first order rate constants of the three reaction steps, their activation parameters and equilibrium constants were estimated by measuring the concentration-time-curves of starting product, intermediate and final product and using a large excess of methanol.There is a linear dependence be tween rate constants of methanolysis and concentration of the catalyst.
Claus, P.,Berndt, T.,Scherzer, K.
p. 1205 - 1216
(2007/10/02)
SYNTHESIS OF UNSYMMETRICAL 1,1-DIALKOXYALKANES AND THEIR SULFUR-CONTAINING ANALOGS
Acyclic acetals and 1,1-di(alkylthio)alkanes enter into exchange reactions in the presence of aprotic acids and of the KU-2 cation-exchange resin with the formation of the unsymmetric acetals and 1-alkoxy-1-alkylthioalkanes.In reaction with ethylal di(ethylthio)methane forms 3,5,7-trioxanonane in addition to ethylthioethoxymethane. 2-Methyl-4-thia-2-hexene was found in the products from the reaction of 1,1-di(ethylthio)-2-methylpropane with methylal.
Gazizova, L. B.,Imashev, U. B.,Musavirov, R. S.,Kantor, E. A.,Zlotskii, S. S.,et al.
p. 226 - 231
(2007/10/02)
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