نتایج جستجو برای: olefins

تعداد نتایج: 2875  

Journal: :Chemical communications 2011
Satoshi Minakata Junpei Hayakawa

An efficient, unique, and convenient method for the iodoamidation of olefins with chloramine salts and I(2) in aqueous media is described. This method was applicable to a wide range of olefins, including aromatic, aliphatic, and electron-deficient olefins.

Journal: :Organic & biomolecular chemistry 2009
Omar Boutureira Joanna F McGouran Robert L Stafford Daniel P G Emmerson Benjamin G Davis

A systematically varied series of conformationally restricted ketones, readily prepared from N-acetyl-D-glucosamine, were tested against representative olefins as asymmetric epoxidation catalysts showing useful selectivities against terminal olefins and, in particular, typically difficult 2,2-disubstituted terminal olefins.

2014
Graham E. Dobereiner Gulin Erdogan Casey R. Larsen Douglas B. Grotjahn Richard R. Schrock

A tandem catalytic reaction has been developed as part of a process to discover tungsten-based olefin metathesis catalysts that have a strong preference for terminal olefins over cis or trans internal isomers in olefin metathesis. This tandem isomerization/terminal olefin metathesis reaction (ISOMET) converts Cn trans internal olefins into C2n−2 cis olefins and ethylene. This reaction is made p...

Journal: :Journal of the American Chemical Society 2001
K Chiba T Miura S Kim Y Kitano M Tada

Electrochemical reactions have proven to be valuable means for reversing the polarity of alkenes and triggering radical anionor radical cation-based cyclizing reactions. Anodic olefin coupling initiated by oxidation of electronrich olefins can provide powerful tools for achieving intramolecular cyclization reactions and building new ring systems. In this case, several combinations of olefins ca...

2017
Soham Maity Pravas Dolui Rajesh Kancherla Debabrata Maiti

Unactivated acyclic internal aliphatic olefins are often found to be unreactive in conventional alkenylation reactions. To address this problem, a cobalt catalyzed allylic selective dehydrogenative Heck reaction with internal aliphatic olefins has been developed. The method is highly regioand stereoselective, the conditions are mild and a wide variety of functional groups can be tolerated. Rema...

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...

2017
Vasiliki Zacharopoulou Angeliki A. Lemonidou

Over the last decade, increasing demand for olefins and their valuable products has prompted research on novel processes and technologies for their selective production. As olefins are predominately dependent on fossil resources, their production is limited by the finite reserves and the associated economic and environmental concerns. The need for alternative routes for olefin production is imp...

Journal: :ChemSusChem 2012
Reiko Jennerjahn Ralf Jackstell Irene Piras Robert Franke Haijun Jiao Matthias Bauer Matthias Beller

The use of noble metal catalysts in homogeneous catalysis has been well established. Due to their price and limited availability, there is growing interest in the substitution of such precious metal complexes with readily available and bio-relevant catalysts. In particular, iron is a "rising star" in catalysis. Herein, we present a general and selective iron-catalyzed monoisomerization of olefi...

2016
Adi E. Nako Juzo Oyamada Masayoshi Nishiura Zhaomin Hou

A homoleptic scandium trialkyl complex in combination with a borate compound served as an excellent catalyst for the C–H addition of aliphatic tertiary amines to olefins. This highly regiospecific, 100% atom efficient C–H bond alkylation reaction was applicable to a wide variety of tertiary amines and olefins, including functionalised styrenes and unactivated a-olefins. This work represents the...

Journal: :Chemical science 2016
Adi E Nako Juzo Oyamada Masayoshi Nishiura Zhaomin Hou

A homoleptic scandium trialkyl complex in combination with a borate compound served as an excellent catalyst for the C-H addition of aliphatic tertiary amines to olefins. This highly regiospecific, 100% atom efficient C-H bond alkylation reaction was applicable to a wide variety of tertiary amines and olefins, including functionalised styrenes and unactivated α-olefins. This work represents the...

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