نتایج جستجو برای: olefin

تعداد نتایج: 2960  

Journal: :Journal of Japan Oil Chemists' Society 1976

2017
Yifei Michelle Liu Berend Smit

In this work, a theoretical framework is developed to explain and predict changes in the product distribution of the propene dimerization reaction, which yields a mixture of C6 olefin isomers, resulting from the use of different porous materials as catalysts. The MOF-74 class of materials has shown promise in catalyzing the dimerization of propene with high selectivity for valuable linear olefi...

2011
Qing-Zhen Han He-Zhen Zhang Yue-Hong Zhao Hao Wen

Economic and powerful olefins separation is the most important technology for the energy optimisation and reduction of fossil fuel in petrochemical industry. On account of that the specific structures of olefins will make some influences on the separation, in this work, by means of density functional theory, we perform a theoretical estimation of the olefin-structure-induced effects on the reac...

Journal: :Dalton transactions 2017
Yan Choi Lam Robert J Nielsen William A Goddard Aswini K Dash

Density functional theory (DFT, B3LYP-D3 with implicit solvation in toluene) was used to investigate the mechanisms of olefin hydrosilylation catalyzed by PDI(Fe) (bis(imino)pyridine iron) complexes, where PDI = 2,6-(ArN[double bond, length as m-dash]CMe)2(C5H3N) with Ar = 2,6-R2-C6H3. We find that the rate-determining step for hydrosilylation is hydride migration from Et3SiH onto the Fe-bound ...

Journal: :Journal of the American Chemical Society 2002
Choon Woo Lee Tae-Lim Choi Robert H Grubbs

Various macrocycles were prepared in one step by a novel ring-expansion method using olefin metathesis.

Journal: :Journal of Japan Oil Chemists' Society 1975

Journal: :Chemical communications 2008
Volodymyr Sashuk Cezary Samojłowicz Anna Szadkowska Karol Grela

The first successful example of olefin cross-metathesis with chloroalkenes is reported.

Journal: :Journal of the American Chemical Society 2004
Jonas Oxgaard Richard P Muller William A Goddard Roy A Periana

The mechanism of hydroarylation of olefins by a homogeneous Ph-Ir(acac)(2)(L) catalyst is elucidated by first principles quantum mechanical methods (DFT), with particular emphasis on activation of the catalyst, catalytic cycle, and interpretation of experimental observations. On the basis of this mechanism, we suggest new catalysts expected to have improved activity. Initiation of the catalyst ...

Journal: :The Journal of the Society of Chemical Industry, Japan 1970

Journal: :Journal of the American Chemical Society 2015
Ho-Keun Lee Ki-Taek Bang Andreas Hess Robert H Grubbs Tae-Lim Choi

We demonstrated tandem ring-opening/ring-closing metathesis (RO/RCM) polymerization of monomers containing two cyclopentene moieties and postmodification via insertion polymerization. In this system, well-defined polymers were efficiently formed by tandem cascade RO/RCM reaction pathway. Furthermore, these polymers could be transformed to new A,B-alternating copolymers via a sequential cross me...

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