Results 231 to 240 of about 13,676 (263)
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Reductive Etherification via Anion-Binding Catalysis
Journal of the American Chemical Society, 2017Reductive condensations of alcohols with aldehydes/ketones to generate ethers are catalyzed by a readily accessible thiourea organocatalyst that operates in combination with HCl. 1,1,3,3-tetramethyldisiloxane serves as a convenient reducing reagent.
Chenfei Zhao +3 more
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2018
Cellulose ethers are of huge importance and produced commercially in large scales; the worldwide consumption of cellulosic ethers in 2006 was estimated to be 637,000 t.
Thomas Heinze +2 more
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Cellulose ethers are of huge importance and produced commercially in large scales; the worldwide consumption of cellulosic ethers in 2006 was estimated to be 637,000 t.
Thomas Heinze +2 more
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Etherification of isoamylenes with methanol
Applied Catalysis, 1987Abstract The etherification of isoamylenes with methanol was studied in a plug-flow reactor at temperatures of 40–80°C. A strong cation-exchange resin was used as catalyst. Under the conditions applied two types of reactions took place: etherification and double-bond isomerization. The only reactive compounds were those with the double bond attached
A.O.I. Krause, L.G. Hammarstro˝m
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Some regularities of chlorosilanes etherification
Russian Journal of General Chemistry, 2009The influence of reagents, solvent polarity, and temperature on the etherification of chlorosilanes ClCH2SiCl3, VinSiCl3, PrSiCl3, and Ph3SiCl with ethanol was studied. Influence of reaction temperature on the ratio of the synthesized alkoxysilane and related side-product siloxane is revealed.
Z. V. Belyakova +5 more
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Polymer Journal, 1992
Poly(oxy-1,4-phenylene-carbonyl-1,4-phenylene-oxy-1,4-phenylene-carbonyl-1,4-phenylene-carbonyl-1,4-phenylene) (PEKEKK) was heated in the presence of potassium carbonate at 340°C to yield another aromatic polyetherketone, which contained not only the original EKEKK repeating unit but also the EK and EKK repeating units.
Isaburo Fukawa +2 more
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Poly(oxy-1,4-phenylene-carbonyl-1,4-phenylene-oxy-1,4-phenylene-carbonyl-1,4-phenylene-carbonyl-1,4-phenylene) (PEKEKK) was heated in the presence of potassium carbonate at 340°C to yield another aromatic polyetherketone, which contained not only the original EKEKK repeating unit but also the EK and EKK repeating units.
Isaburo Fukawa +2 more
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Etherification on Zeolites: MTBE synthesis
Catalysis Reviews, 2002Although the use of methyl-tert butyl ether (MTBE) in reformulated gasoline has raised concerns due to its detection in ground water and has led to its gradual phase out in parts of the United States, the use of heavier ethers in gasoline in the future is possible.
James G. Goodwin +3 more
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Etherification of hydroxysteroids via triflates
Tetrahedron Letters, 1994Abstract Triflates of saturated alcohols are useful in the alkylation of 3- and 17-hydroxysteroids in the presence of hindered amines. The etherification is successful even in those cases where other alkylating agents are noneffective.
Anatoly M. Belostotskii, Alfred Hassner
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Pd/PTABS: Low Temperature Etherification of Chloroheteroarenes
The Journal of Organic Chemistry, 2018A mild, general, and highly efficient catalytic etherification protocol for chloroheteroarenes was developed using the Pd/PTABS catalytic system. The protocol is selective for the etherification of chloroheteroarenes using a large variety of electron-rich and electron-deficient phenol bearing synthons which include inter alia biologically and ...
Shatrughn Bhilare +6 more
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Tetrahedron, 1989
Abstract Butyltin trichloride, as a catalyst precursor, promotes the following processes: (i) etherification of 2,3-unsaturated alcohols, (ii) etherification of functional diols, (iii) cyclization of 2,5-hexanedione, and (iv) dehydration of cyclic diols. Many examples are reported.
Daniele Marton +2 more
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Abstract Butyltin trichloride, as a catalyst precursor, promotes the following processes: (i) etherification of 2,3-unsaturated alcohols, (ii) etherification of functional diols, (iii) cyclization of 2,5-hexanedione, and (iv) dehydration of cyclic diols. Many examples are reported.
Daniele Marton +2 more
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Pentaalkylguanidines as etherification and esterification catalysts
Tetrahedron, 1990Abstract Several pentaalkylguanidines have been prepared and found to be superior catalysts for the preparation of aryl and aralkyl ethers from carbonates and for the methylation of phenols with dimethylcarbonate. They also act as effective catalysts for esterification of acids with alkyl chloroformates but not for the acetylation of tertiary ...
Gérard Barcelo +3 more
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