Hoveyda–Grubbs II Catalyst: A Useful Catalyst for One-Pot Visible-Light-Promoted Ring Contraction and Olefin Metathesis Reactions

2018 ◽  
Vol 20 (9) ◽  
pp. 2774-2777 ◽  
Author(s):  
Yun Ge ◽  
Wangbin Sun ◽  
Bingbing Pei ◽  
Jia Ding ◽  
Yaojia Jiang ◽  
...  
Keyword(s):  
Visible Light ◽  
Olefin Metathesis ◽  
One Pot ◽  
Ring Contraction ◽  
Metathesis Reactions

scholarly journals Cover Feature: One‐pot Synthesis of 1,3‐Butadiene and 1,6‐Hexanediol Derivatives from Cyclopentadiene (CPD) via Tandem Olefin Metathesis Reactions (ChemCatChem 21/2018)

ChemCatChem ◽  
2018 ◽  
Vol 10 (21) ◽  
pp. 4780-4780
Author(s):  
Gábor Turczel ◽  
Ervin Kovács ◽  
Eszter Csizmadia ◽  
Tibor Nagy ◽  
Imre Tóth ◽  
...  
Keyword(s):  
Olefin Metathesis ◽  
One Pot ◽  
One Pot Synthesis ◽  
Metathesis Reactions

scholarly journals One‐pot Synthesis of 1,3‐Butadiene and 1,6‐Hexanediol Derivatives from Cyclopentadiene (CPD) via Tandem Olefin Metathesis Reactions

ChemCatChem ◽  
2018 ◽  
Vol 10 (21) ◽  
pp. 4870-4877 ◽  
Author(s):  
Gábor Turczel ◽  
Ervin Kovács ◽  
Eszter Csizmadia ◽  
Tibor Nagy ◽  
Imre Tóth ◽  
...  
Keyword(s):  
Olefin Metathesis ◽  
One Pot ◽  
One Pot Synthesis ◽  
Metathesis Reactions

Catalytic Carbonyl-Olefin Metathesis of Aliphatic Ketones: Iron(III) HomoDimers as Lewis Acidic Superelectrophiles

2018 ◽  
Author(s):  
Haley Albright ◽  
Paul S. Riehl ◽  
Christopher C. McAtee ◽  
Jolene P. Reid ◽  
Jacob R. Ludwig ◽  
...  
Keyword(s):  
Lewis Acid ◽  
Olefin Metathesis ◽  
Acid Activation ◽  
Lewis Acid Catalysts ◽  
Distinct Mode ◽  
Aliphatic Ketones ◽  
Carbon Carbon Bond ◽  
Metathesis Reactions ◽  
Acid Catalyzed

<div>Catalytic carbonyl-olefin metathesis reactions have recently been developed as a powerful tool for carbon-carbon bond</div><div>formation. However, currently available synthetic protocols rely exclusively on aryl ketone substrates while the corresponding aliphatic analogs remain elusive. We herein report the development of Lewis acid-catalyzed carbonyl-olefin ring-closing metathesis reactions for aliphatic ketones. Mechanistic investigations are consistent with a distinct mode of activation relying on the in situ formation of a homobimetallic singly-bridged iron(III)-dimer as the active catalytic species. These “superelectrophiles” function as more powerful Lewis acid catalysts that form upon association of individual iron(III)-monomers. While this mode of Lewis acid activation has previously been postulated to exist, it has not yet been applied in a catalytic setting. The insights presented are expected to enable further advancement in Lewis acid catalysis by building upon the activation principle of “superelectrophiles” and broaden the current scope of catalytic carbonyl-olefin metathesis reactions.</div>

scholarly journals Optical, electrochemical and photocatalytic properties of cobalt doped CsPbCl3 nanostructures: a one-pot synthesis approach

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Aadil Ahmad Bhat ◽  
Shakeel Ahmad Khandy ◽  
Ishtihadah Islam ◽  
Radha Tomar
Keyword(s):  
Optical Properties ◽  
Visible Light ◽  
Active Material ◽  
Blue Emission ◽  
Structural Features ◽  
Ion Concentration ◽  
Photocatalytic Properties ◽  
Charge Storage ◽  
Cobalt Doping ◽  
One Pot

AbstractThe present manuscript aims at the synthesis of cesium based halide perovskite nanostructures and the effect of cobalt doping on the structural, optical, lumnisent, charge storage and photocatalytic properties. In a very first attempt, we report the solvothermal synthesis of Co doped CsPbCl3 nanostructures under subcritical conditions. The structural features were demonstrated by X-ray diffraction (XRD) Surface morphology determined cubic shape of the synthesized particles. Doping is an excellent way to modify the properties of host material in particular to the electronic structure or optical properties. Incorporation of Co2+ ions in the perovskite structure tunes the optical properties of the nanostructures making this perovskite a visible light active material (Eg = 1.6 eV). This modification in the optical behaviour is the result of size effect, the crystallite size of the doped nanostructures increases with cobalt doping concentration. Photolumniscance (PL) study indicated that CsPbCl3 exhibited Blue emission. Thermogravametric analysis (TGA) revealed that the nanostructures are quite stable at elavated temperatures. The electrochemical performance depicts the pseudocapacative nature of the synthesized nanostructures and can used for charge storage devices. The charge storage capability showed direct proportionality with cobalt ion concentration. And Finally the photocatalytic performance of synthesized material shows superior catalytic ability degrading 90% of methylene blue (MB) dye in 180 min under visible light conditions.

scholarly journals Modification of proteins using olefin metathesis

2020 ◽  
Vol 4 (4) ◽  
pp. 1040-1051 ◽  
Author(s):  
Marco S. Messina ◽  
Heather D. Maynard
Keyword(s):  
Small Molecules ◽  
Olefin Metathesis ◽  
Aqueous Media ◽  
Metathesis Reactions ◽  
P Proteins

Proteins are modified with small molecules and polymers via olefin metathesis reactions in aqueous media.

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