Results 301 to 310 of about 78,923 (333)

Selective hydrogenation of benzalacetone

Journal of Applied Chemistry, 1967
AbstractBenzalacetone was hydrogenated using a Raney nickel catalyst, and various amounts of HCl, NaCl and H3PO4 in ethyl alcohol were added to test their inhibiting effect on catalytic activity. In the presence of HCl and H3PO4, Raney nickel lost its catalytic activity, and the rate of hydrogenation was decreased, but NaCl had no effect.
Y. Abdoh, M. R. Darvish
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Selective Hydrogenation of Phenol

ChemNanoMat, 2018
AbstractThe selective hydrogenation of phenol to cyclohexanone has attracted a great deal of attention both in industry and academia. In this review, the significance, strategies and mechanisms for the production of cyclohexanone are briefly described.
Xiangqian Kong, Yutong Gong, Shanjun Mao, Yong Wang   +3 more
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Selective Hydrogenation Reactions

2013
Gold catalysts demonstrated high selectivity in hydrogenation of the multifunctional molecules. Selective hydrogenation of succinic anhydride (SAN) over gold catalysts was studied. Gold catalysts demonstrated higher activity and selectivity compared to other studied metals.
Olga A. Simakova, Robert J. Davis, Dmitry Yu. Murzin   +2 more
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The hydrogen-ion selective glass electrode

Talanta, 1975
The properties and mechanism of operation of hydrogen-ion selective glass electrodes are reviewed and a model using information from recent research is presented. In the gel layer of a pH-glass protons or hydronium ions are bound to negative charges in a silicon network cross-linked with bi- or tervalent metal ions.
G, Johansson, B, Karlberg, A, Wikby
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Selective Hydrogenation of Dicyclopentadiene

Russian Journal of Applied Chemistry, 2020
The previously developed procedures for preparing dihydrodicyclopentadiene (DHDCPD) and tetrahydrodicyclopentadiene (THDCPD) are considered comprehensively. The performance of traditional dicyclopentadiene (DCPD) hydrogenation catalysts (Raney Ni, Pd/C) is compared to that of catalysts based on Ni or Pd nanoparticles on a polymer matrix.
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Effect of solvent and hydrogen during selective hydrogenation

Tetrahedron Letters, 2001
Abstract Described is the solvent effect for the chemoselective hydrogenation of alkenes having a benzyloxy group (Bn-O-) using a hydrogenation system employing atomic hydrogen permeating through a Pd sheet electrode.
Shojiro Maki, Yasuhiro Harada, Ryo Matsui, Makiko Okawa, Takashi Hirano, Haruki Niwa, Megumi Koizumi, Yoshinori Nishiki, Tsuneto Furuta, Hiroshi Inoue, Chiaki Iwakura   +10 more
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Selective heterogeneously catalyzed hydrogenations

Catalysis Today, 1997
Abstract A number of catalytic hydrogenations have been discussed with emphasis on reaction selectivity. These reactions were examples of chemoselectivity, regioselectivity, stereoselectivity, diastereoselectivity and enantioselectivity. Factors such as catalyst selection, reaction conditions and the steric nature of the substrate were discussed in ...
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Selectivities in Partial Hydrogenation

Journal of the American Oil Chemists' Society, 2009
They also mention AOCS Official Method Tz 1b-79 to calculate the above selectivities. However, when these selectivity ratios were defined more than 40 years ago, simplifications had to be introduced and assumptions had to be made and it is my impression that nowadays, people are insufficiently aware of these simplifications and assumptions and moreover
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Selective hydrogenation and transfer hydrogenation reactions

2018
Diese Dissertation beschreibt Untersuchungen an Katalysatoren zur selektiven Transferhydrierung von ungesättigten Carbonylverbindungen. Insbesondere wird die Anwendbarkeit von EtOH als alternative Wasserstoffquelle zu dem weitverbreiteten iPOH beschrieben und diskutiert.
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Selective hydrogenation over ruthenium catalysts

Applied Catalysis A: General, 1995
Ruthenium catalysts are widely used for selective hydrogenation of a carbonyl group in the vicinity of conjugated or isolated double bonds. The α,β-unsaturated alcohols prepared in this way are compounds of great commercial importance. The effects of promoters, particle size and supports on such reactions are discussed.
Petr Kluson, Libor Cerveny
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