A new catalytic method for ecofriendly synthesis of bis- and trisindolylmethanes by zirconyldodecylsulfate under mild conditions

2009 ◽  
Vol 46 (3) ◽  
pp. 535-539 ◽  
Author(s):  
Maasoumeh Jafarpour ◽  
Abdolreza Rezaeifard ◽  
Tayebeh Golshani
Keyword(s):  
Catalytic Method ◽  
Mild Conditions

scholarly journals Enantioenriched Quaternary α-Pentafluoroethyl Derivatives of Alkyl 1-Indanone-2-Carboxylates

2020 ◽  
Author(s):  
Albert Granados ◽  
Anna Balleteros ◽  
Adelina Vallribera
Keyword(s):  
Hypervalent Iodine ◽  
Catalytic Method ◽  
Quaternary Centers ◽  
Mild Conditions ◽  
Reaction Proceeds ◽  
Mechanistic Investigations ◽  
Derivatives Of

An electrophilic enantioselective catalytic method for the a-pentafluoroethylation of alkyl 1-indanone-2-carboxylates is described. Under the use of La(OTf)<sub>3</sub> in combination with (<i>S,R</i>)-indanyl-<i>pybox</i> ligand good results in terms of yield and enantioselectivities were achieved (up to 89% <i>ee</i>). The reaction proceeds under mild conditions leading to the formation of enantioenriched quaternary centers. This methodology uses an hypervalent iodine(III)-CF<sub>2</sub>CF<sub>3</sub> reagent and mechanistic investigations are consistent with the involvement of a radical pathway.

Experimental and mathematical optimization of the peroxide delignification of larch in the presence of MnSO4 catalyst

2020 ◽  
Vol 20 (1) ◽  
pp. 67-75
Author(s):  
I. G. Sudakova ◽  
N. V. Garyntseva ◽  
A. I. Chudina ◽  
B. N. Kuznetsov
Keyword(s):  
Mathematical Optimization ◽  
Single Step ◽  
High Yield ◽  
Optimal Conditions ◽  
Optimal Parameters ◽  
Mathematical Methods ◽  
Catalytic Method ◽  
Mild Conditions ◽  
Xrd Studies ◽  
Peroxide Delignification

Experimental and mathematical methods were used to obtain the optimal parameters of peroxide delignification of larch in the presence of MnSO4 catalyst, which provide a high yield of cellulose (44.3 wt.%) with a low content of residual lignin: temperature 100 °C, content of H2O2 6 wt.%, CH3COOH 25 wt.%, hydromodulus 15, and duration 3 h. The cellulose produced under optimal conditions had the following chemical composition: cellulose 92.7 wt.%, lignin 0.6 wt.%, and hemicellulose 5.7 wt.%. IR spectroscopy and XRD studies revealed that the structure of cellulose produced from larch is similar to that of industrial microcrystalline cellulose. The proposed catalytic method allows obtaining larch-derived cellulose with a minimum content of lignin under mild conditions in a single step with a high yield, crystallinity 0.8 and crystallite size 3.0 nm.

Efficient Construction of 4-hydroxy-4-arylbutan-2-ones through an Enantioselective Aldol Reaction Mediated by a Recoverable Proline-Based Chiral Ionic Liquid

2020 ◽  
Vol 42 (2) ◽  
pp. 243-243
Author(s):  
Dao Cai Wang Dao Cai Wang ◽  
Cong Wu Cong Wu ◽  
Chi Zhang Chi Zhang ◽  
Fang Zhen Zhou Fang Zhen Zhou ◽  
Hang Song and Xiao Peng Liu Hang Song and Xiao Peng Liu
Keyword(s):  
Ionic Liquid ◽  
Column Chromatography ◽  
Aldol Reaction ◽  
Reaction Medium ◽  
Aromatic Aldehydes ◽  
Catalytic Method ◽  
Mild Conditions ◽  
Satisfactory Performance ◽  
Efficient Construction ◽  
Chiral Ionic Liquid

Chiral ionic liquid derived from L-proline worked as an excellent organocatalyst for the enantioselective aldol reaction of aromatic aldehydes and acetone. The reaction was conducted in the presence of [BMIM][BF4] as reaction medium. The substrate scope of aldol reaction was successfully explored for various aromatic aldehydes under the mild conditions. The generated aldol products were separated by column chromatography with moderate to good yields as well as enantioselectivities. The main advantage of this catalytic method was that the catalyst and solvent could be recovered at the same time and reused for at least five times with satisfactory performance.

Convenient Semihydrogenation of Azoarenes to Hydrazoarenes Using H2

2021 ◽  
Author(s):  
Manoj Kumar Sahoo ◽  
Ganesan Sivakumar ◽  
Sanjay Jadhav ◽  
Samrin Shaikh ◽  
Balaraman Ekambaram
Keyword(s):  
Selective Hydrogenation ◽  
Molecular Hydrogen ◽  
Catalytic Method ◽  
Mild Conditions

Convenient and highly selective hydrogenation of azoarenes using molecular hydrogen to access diverse hydrazoarenes is reported. The present catalytic method is general, operationally simple, and operates under exceedingly mild conditions...

scholarly journals Rhodium-catalyzed reductive carbonylation of aryl iodides to arylaldehydes with syngas

2020 ◽  
Vol 16 ◽  
pp. 645-656 ◽  
Author(s):  
Zhenghui Liu ◽  
Peng Wang ◽  
Zhenzhong Yan ◽  
Suqing Chen ◽  
Dongkun Yu ◽  
...  
Keyword(s):  
Reaction Mechanism ◽  
Industrial Applications ◽  
Catalytic Method ◽  
Broad Application ◽  
Aryl Aldehydes ◽  
Mild Conditions ◽  
Aryl Iodides ◽  
Reductive Carbonylation ◽  
Experimental Parameters ◽  
Application Prospects

The reductive carbonylation of aryl iodides to aryl aldehydes possesses broad application prospects. We present an efficient and facile Rh-based catalytic system composed of the commercially available Rh salt RhCl3·3H2O, PPh3 as phosphine ligand, and Et3N as the base, for the synthesis of arylaldehydes via the reductive carbonylation of aryl iodides with CO and H2 under relatively mild conditions with a broad substrate range affording the products in good to excellent yields. Systematic investigations were carried out to study the experimental parameters. We explored the optimal ratio of Rh salt and PPh3 ligand, substrate scope, carbonyl source and hydrogen source, and the reaction mechanism. Particularly, a scaled-up experiment indicated that the catalytic method could find valuable applications in industrial productions. The low gas pressure, cheap ligand and low metal dosage could significantly improve the practicability in both chemical researches and industrial applications.

scholarly journals Enantioenriched Quaternary α-Pentafluoroethyl Derivatives of Alkyl 1-Indanone-2-Carboxylates

2020 ◽  
Author(s):  
Albert Granados ◽  
Anna Balleteros ◽  
Adelina Vallribera
Keyword(s):  
Hypervalent Iodine ◽  
Catalytic Method ◽  
Quaternary Centers ◽  
Mild Conditions ◽  
Reaction Proceeds ◽  
Mechanistic Investigations ◽  
Derivatives Of

An electrophilic enantioselective catalytic method for the a-pentafluoroethylation of alkyl 1-indanone-2-carboxylates is described. Under the use of La(OTf)<sub>3</sub> in combination with (<i>S,R</i>)-indanyl-<i>pybox</i> ligand good results in terms of yield and enantioselectivities were achieved (up to 89% <i>ee</i>). The reaction proceeds under mild conditions leading to the formation of enantioenriched quaternary centers. This methodology uses an hypervalent iodine(III)-CF<sub>2</sub>CF<sub>3</sub> reagent and mechanistic investigations are consistent with the involvement of a radical pathway.

The Diorgano Dichalcogenides Addition to Benzyne under Mild Conditions

2007 ◽  
Author(s):  
Fabiano Toledo ◽  
Henrique Marques ◽  
João Comasseto ◽  
Cristiano Raminelli
Keyword(s):  
Mild Conditions
Sign in / Sign up

Export Citation Format

Share Document