Catalytic hydrogenation : V. An example of trans hydrogenation of an ethylenic double bond ☆Liquid phase hydrogenations of (i) 2,3-dimethylbicyclo[ 2,2,2]oct- 2-ene, (ii) 3-methyl- 2-methylenebicyclo[ 2,2,2] oc
Straight-run materials do not usually present serious problems with regard to nitrogen, but feeds such as coker naphtha may contain around 50 ppm nitrogen and removal of this quantity may require high-pressure hydrogenation (800–1,000 psi) over nickel–cobalt–molybdenum on an alumina catalyst. ...
M. Conversion of a protein to a homogeneous asymmetric hydrogenation catalyst by site-specific modification with a diphosphinerhodium(i) moiety. J. Am. Chem. Soc. 100, 306–307 (1978). Article CAS Google Scholar Schwizer, F. et al. Artificial metalloenzymes: reaction scope and optimization...
Hydrogenation reactions to 7 and 9 were performed on 1.0 mmol scale. Reactions to the cannabinoids were performed using an excess of isopiperitenol (1.1–1.5 equiv.). Isolated yields after chromatographic purification. d.r. and e.r. were determined by high-performance liquid chromatography or...
Liquid phase hydrogenations of (i) 2,3-dimethylbicyclo[ 2,2,2]oct- 2-ene, (ii) 3-methyl- 2-methylenebicyclo[ 2,2,2] octane, and several of their mixtures have been studied over Raney nickel, Adams palladium, and Adams platinum. The stereo-chemistry observed on the platinum catalyst ca...
compositions have been applied, including, for example, Ni and W. In contrast to the supported Pt and Pt-alloy catalysts used in reforming, the hydrodesulfurization catalysts have hydrogenation activity in the presence of high concentrations of sulfur compounds. ...
thermofor catalytic cracking (TCC). In addition to cracking, catalytic activities include dehydrogenation, hydrogenation, and isomerization. View chapter Book 2009, Handbook of Pollution Prevention and Cleaner Production - Best Practices in The Petroleum IndustryNicholas P. Cheremisinoff, Paul Rosenfeld ...
For example, Witoon et al. [70] reported that Al2O3 strongly interacted with K to form KAlO2 which could strongly bind H, inhibiting the over hydrogenation of olefins to paraffins. Besides, Numpilai et al. [65] informed that the pore sizes of Al2O3 played a vital role on the ...
To solve these problems, different processes have been proposed in the prior art. DE-OS-25 19 838. for example, discloses a continuous process for the catalytic hydrogenation of nitro compounds to the corresponding amino compounds in which the catalyst particles of 0.5 to 3 mm are arranged in...
A method developed by former Mitsubishi Chemical Ind. (presently Mitsubishi Chemical Corp.) is an example of efficient hydrogenation of carboxylic acids using molecular hydrogen. This process provides aldehydes selectively in high yield by hydrogenation in vapor phase at high temperature (330˜400° ...