نتایج جستجو برای: heterogeneous oligomerization of olefins

تعداد نتایج: 21174884  

Fischer-Tropsch synthesis is a promising route for production of light olefins via CO hydrogenation over transition metals. Co is one of the most active metals for Fischer-Tropsch synthesis. Some different variables such as preparation parameters and operational factors can strongly affect the selectivity of Fischer-Tropsch synthesis toward the special products. In the case of preparat...

Journal: :Chemical communications 2007
Katie L Klotz Luke M Slominski Anthony V Hull Victoria M Gottsacker Rubén Mas-Ballesté Lawrence Que Jason A Halfen

Iron(II) complexes of polydentate nitrogen donor ligands catalyze the rapid aziridination of olefins by PhINTs.

Journal: :Journal of the American Chemical Society 2003
Yong Cui Chuan He

A unique disilver(I) compound is an efficient catalyst for aziridination of olefins.

Journal: :Journal of immunology 2008
Thorsten Stroh Arvind Batra Rainer Glauben Inka Fedke Ulrike Erben Anjo Kroesen Markus M Heimesaat Stefan Bereswill Stephen Girardin Martin Zeitz Britta Siegmund

Translocation of bacteria into the mesenteric fat during intestinal inflammation and the expression of functional TLR1-9 in murine preadipocytes and adipocytes suggest an active role for these cells in innate immunity. The present study focuses on nucleotide oligomerization domains 1 and 2 representing intracellular pattern recognition receptors that sense motifs derived from bacterial peptidog...

2001
Feimeng Zhou

A long-sought goal in electrochemistry has been the observation of the intermediate, presumably the anion radical, produced in the electrohydrodimerization (EHD) of acrylonitrile (AN). The EHD of activated olefins is an important class of electroorganic reactions, especially because a commercial process for adiponitrile synthesis is based upon the EHD of a~rylonitrile.l-~ A number of studies of...

Journal: :Journal of the American Chemical Society 2016
Duyi Shen Claudio Saracini Yong-Min Lee Wei Sun Shunichi Fukuzumi Wonwoo Nam

Photocatalytic enantioselective epoxidation of terminal olefins using a mononuclear non-heme chiral manganese catalyst, [(R,R-BQCN)MnII]2+, and water as an oxygen source yields epoxides with relatively high enantioselectivities (e.g., up to 60% enantiomeric excess). A synthetic mononuclear non-heme chiral Mn(IV)-oxo complex, [(R,R-BQCN)MnIV(O)]2+, affords similar enantioselectivities in the epo...

Journal: :Science 2003
Keigo Kamata Koji Yonehara Yasutaka Sumida Kazuya Yamaguchi Shiro Hikichi Noritaka Mizuno

Epoxides are an important class of industrial chemicals that have been used as chemical intermediates. Catalytic epoxidation of olefins affords an interesting production technology. We found a widely usable green route to the production of epoxides: A silicotungstate compound, [gamma-SiW10O34(H2O)2]4-, is synthesized by protonation of a divacant, lacunary, Keggin-type polyoxometalate of [gamma-...

2014
Santiago Zolezzi Sergio A. Moya Gonzalo Valdebenito Gabriel Abarca Jose Parada Pedro Aguirre

Palladium(II) complexes containing phosphine donor ligands derived from naphthyl(diphenyl)phosphine were synthesized and characterized by NMR and elemental analysis. The complexes were studied as catalyst precursors in the methoxycarbonylation reaction of several aromatic and aliphatic olefins under mild conditions. The catalysts reported high chemoselectivities (over 96%) and regioselectivitie...

2014
Marzena BIAŁEK Wioletta OCHĘDZAN-SIODŁAK Katarzyna DZIUBEK Krystyna CZAJA

Introduction Middle 1950s may be treated as the beginning of the age of plastics – their global production in last 60 years have increased from approx. 1.5 mln to almost 290 mln tons. The dominating position in production and consumption of these materials for many years has been occupied by polyolefins (in Europe 48% from 57 mln tons of plastics) [1]. Forecasters predict that in coming years t...

2004
Ivan M. Lorkovic Aysen Yilmaz Gurkan A. Yilmaz Xiao-Ping Zhou Leroy E. Laverman Shouli Sun Dieter J. Schaefer Michael Weiss Maria L. Noy C. Ian Cutler Jeffrey H. Sherman Eric W. McFarland Galen D. Stucky Peter C. Ford I. M. Lorkovic

We describe a novel, integrated multi-step process for the partial oxidation of alkanes to alcohols, ethers or olefins using O2 as oxidant. The sequential transformations are (1) alkane bromination to alkyl bromide(s) and HBr, (2) reaction of this mixture with solid metal oxide (MO) to neutralize the HBr and to generate oxygenated products or olefins plus solid metal bromide, and (3) oxidation ...

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