Results 161 to 170 of about 774,389 (198)

Asymmetric hydrogenation of indene carboxylic acids: stereochemistry of hydrogen addition

Tetrahedron: Asymmetry, 1999
Abstract The stereochemistry of hydrogen addition to α,β-unsaturated carboxylic acids was studied by means of hydrogenation of indene carboxylic acids and their derivatives. Experiments were carried out over Pd/Al2O3 in the presence and absence of cinchonidine as a chiral modifier.
K Borszeky, T Mallat, A Baiker
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Conjugated Additions in Hydrogen Fluoride

Angewandte Chemie International Edition in English, 1969
AbstractFluorine and another substituent can be added in a single step to compounds having CC double bonds in anhydrous hydrogen fluoride. It is possible in this way to obtain e.g. α‐fluorinated β‐halogeno, β‐alkyl, β‐nitro, and β‐amino compounds, and also (in some cases by secondary reactions) fluorinated ethers, alcohols, esters, and carboxylic acids,
L. S. German, I. L. Knunyantz
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An instance of trans-hydrogen addition in catalytic homogeneous hydrogenation

Journal of the Chemical Society D: Chemical Communications, 1969
Reduction of diphenylacetylene with deuterium gas using the py3RhCl3–Me2N·CHO–NaBH4 catalyst system is found to involve deuterium incorporation at the ortho-position of the phenyl group of the product, trans-stilbene, considered to arise by a mechanism of ortho-deuteriation accompanied by 1,3-hydride shift.
Peter Abley, F. J. McQuillin
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Manipulating hydrogen oxy-combustion through carbon dioxide addition

Fuel, 2023
[EN] Hydrogen (H2) is increasingly viewed as an attractive carbon-free fuel due to its potential compatibility with the existing transportation and conversion infrastructure. However, one of the major challenges facing large-scale deployment is the fundamentally different combustion properties it has in comparison to commonplace hydrocarbon fuels such ...
Md Nayer Nasim, Behlol Nawaz, Shubhra Kanti Das, Amina SubLaban, Luis Miguel García-Cuevas González, José Ramón Serrano, J. Hunter Mack   +6 more
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In-Catalyzed Transfer Hydrogenation and Regioselective Hydrogen–Deuterium Addition to the Olefins

The Journal of Organic Chemistry, 2023
A unique and valuable methodology is developed for the hydrogenation of aromatic as well as aliphatic 1,1-di- and trisubstituted alkenes. In the presence of catalytic InBr3, readily available 1,3-benzodioxole and residual H2O present in the reaction mixture are utilized as a hydrogen gas surrogate and proved to be a practical source of deuterium ...
Gautam Kumar, Debkanta Bhattacharya, Parag Mistry, Indranil Chatterjee   +3 more
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Hydrogenated monoterpenes as diesel fuel additives

Fuel, 2009
Myrcene and limonene were hydrogenated to their fully saturated forms, 2,6-dimethyloctane and 1-isopropyl-4-methylcyclohexane, respectively. Mixtures of diesel fuel and up to 10% of each saturated hydrocarbon were tested by ASTM D975 to evaluate the 2,6-dimethyloctane and 1-isopropyl-4-methylcyclohexane as diesel fuel additives. The results showed that
Noah I. Tracy, Daichuan Chen, Daniel W. Crunkleton, Geoffrey L. Price   +3 more
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Rotary Engine Combustion With Hydrogen Addition

SAE Technical Paper Series, 1976
<div class="htmlview paragraph">The lean operating limit of a rotary combustion engine was extended by hydrogen-enriched fuel to equivalence ratios as low as 0.49. Reductions in NO_x and CO emissions from baseline conditions were observed, although HC emissions increased significantly.</div> <div class="htmlview ...
J. E. Cichanowicz, R. F. Sawyer
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Selective hydrogenation with copper catalysts: III. Hydrogen addition and isomerization

Journal of the American Oil Chemists' Society, 1970
Abstractβ‐Eleostearate was found to be reduced by 1,6 addition of hydrogen. Because of the extensive isomerization of conjugated trienes during hydrogenation, the occurrence of 1,2 and 1,4 addition reactions could not be proven. Conjugated dienes were reduced by both 1,2 and 1,4 addition of hydrogen.
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On the hydrogen addition to graphene

Journal of Molecular Structure: THEOCHEM, 2009
Herein, we report on a comparative study of the addition of hydrogen to graphene. The binding energies and structural parameters determined using Siesta are in excellent agreement with those calculated employing more sophisticated and computational expensive plane waves codes.
Pablo A. Denis, Federico Iribarne
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Heterogeneously catalyzed antarafacial addition of hydrogen

Journal of Molecular Catalysis, 1980
Abstract The hydrogenation of non-migrating double bonds in bicyclic olefins over platinum, palladium, and rhodium was investigated. With platinum, up to 16% antarafacial (trans) addition was observed. The hydrogenation over palladium proceeded suprafacially (cis) in neutral medium, but in the presence of strong acid up to 60% antarafacial addition ...
F. van Rantwijk, A. van Vliet, H. van Bekkum   +2 more
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