Aminoethylimidazole ionic liquid grafted MIL-101-NH2 heterogeneous catalyst for conversion of CO2 and epoxide without solvent and cocatalyst

2021 ◽  
Author(s):  
Chenglong Bao ◽  
Yichen Jiang ◽  
Liyan Zhao ◽  
Dazhi Li ◽  
Ping Xu ◽  
...  
Keyword(s):  
Hydrogen Bond ◽  
Ionic Liquid ◽  
Lewis Acid ◽  
Ring Opening ◽  
Synergistic Effects ◽  
Acid Sites ◽  
Epoxide Ring ◽  
Hydrogen Bond Donor ◽  
Lewis Acid Sites ◽  
Epoxide Ring Opening

Besides the activation of CO2 by Lewis basic groups, the synergistic effects of Lewis acid sites (or hydrogen bond donor) together with halogen nucleophilic anions to activate epoxide ring opening...

scholarly journals Correction: Epoxide ring-opening reaction promoted by ionic liquid reactivity: interplay of experimental and theoretical studies

2019 ◽  
Vol 9 (22) ◽  
pp. 6532-6532
Author(s):  
Shengxin Chen ◽  
Guixiang Zeng ◽  
Yingwei Li ◽  
Bin He ◽  
Ruixia Liu ◽  
...  
Keyword(s):  
Ionic Liquid ◽  
Ring Opening ◽  
Epoxide Ring ◽  
Theoretical Studies ◽  
Epoxide Ring Opening ◽  
Ring Opening Reaction ◽  
Experimental And Theoretical Studies

Correction for ‘Epoxide ring-opening reaction promoted by ionic liquid reactivity: interplay of experimental and theoretical studies’ by Shengxin Chen et al., Catal. Sci. Technol., 2019, DOI: 10.1039/c9cy00953a.

Direct synthesis of alkynylphosphonates from alkynes and phosphite esters catalyzed by Cu/Cu2O nanoparticles supported on Nb2O5

2018 ◽  
Vol 42 (16) ◽  
pp. 13957-13962 ◽  
Author(s):  
Tao Yuan ◽  
Fei Chen ◽  
Guo-ping Lu
Keyword(s):  
Lewis Acid ◽  
Synergistic Effects ◽  
Copper Catalyst ◽  
Direct Synthesis ◽  
Acid Sites ◽  
Lewis Acid Sites ◽  
Strong Lewis Acid ◽  
Cu2o Nanoparticles

A new, recyclable and efficient copper catalyst for cross-couplings of alkynes and phosphite esters has been disclosed, in which the synergistic effects of Nb2O5 on the catalyst are found owing to its strong Lewis acid sites.

scholarly journals Regenerable Acidity of Graphene Oxide in Promoting Multicomponent Organic Synthesis

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Virgilio D. Ebajo ◽  
Cybele Riesse L. Santos ◽  
Glenn V. Alea ◽  
Yuya A. Lin ◽  
Chun-Hu Chen
Keyword(s):  
Graphene Oxide ◽  
Organic Synthesis ◽  
Lewis Acid ◽  
Photoelectron Spectroscopy ◽  
Acid Sites ◽  
Lewis Acidity ◽  
Epoxide Ring ◽  
Multicomponent Synthesis ◽  
Lewis Acid Sites ◽  
Toxic Reaction

Abstract The Brønsted acidity of graphene oxide (GO) materials has shown promising activity in organic synthesis. However, roles and functionality of Lewis acid sites remain elusive. Herein, we reported a carbocatalytic approach utilizing both Brønsted and Lewis acid sites in GOs as heterogeneous promoters in a series of multicomponent synthesis of triazoloquinazolinone compounds. The GOs possessing the highest degree of oxidation, also having the highest amounts of Lewis acid sites, enable optimal yields (up to 95%) under mild and non-toxic reaction conditions (85 °C in EtOH). The results of FT-IR spectroscopy, temperature-programed decomposition mass spectrometry, and X-ray photoelectron spectroscopy identified that the apparent Lewis acidity via basal plane epoxide ring opening, on top of the saturated Brønsted acidic carboxylic groups, is responsible for the enhanced carbocatalytic activities involving Knoevenagel condensation pathway. Recycled GO can be effectively regenerated to reach 97% activity of fresh GO, supporting the recognition of GO as pseudocatalyst in organic synthesis.

ChemInform Abstract: Non-Lewis Acid Catalyzed Epoxide Ring Opening with Amino Acid Esters.

ChemInform ◽  
2009 ◽  
Vol 40 (40) ◽  
Author(s):  
Christine Philippe ◽  
Thierry Milcent ◽  
Benoit Crousse ◽  
Daniele Bonnet-Delpon
Keyword(s):  
Amino Acid ◽  
Lewis Acid ◽  
Ring Opening ◽  
Epoxide Ring ◽  
Amino Acid Esters ◽  
Epoxide Ring Opening ◽  
Acid Catalyzed ◽  
Acid Esters

Aluminium Oxide Supported on SBA-15 Molecular Sieves as Potential Lewis Acid Catalysts for Epoxide Ring Opening Using Aniline

2018 ◽  
Vol 148 (5) ◽  
pp. 1407-1415 ◽  
Author(s):  
Rekha Yadav ◽  
Akhila Muralidhar ◽  
A. Shamna ◽  
P. Aghila ◽  
Lakshmiprasad Gurrala ◽  
...  
Keyword(s):  
Lewis Acid ◽  
Molecular Sieves ◽  
Ring Opening ◽  
Aluminium Oxide ◽  
Epoxide Ring ◽  
Acid Catalysts ◽  
Lewis Acid Catalysts ◽  
Epoxide Ring Opening

Concerning Lewis Acid Promoted, Directing-Group-Free Epoxide-Ring-Opening Cascades

Synlett ◽  
2006 ◽  
Vol 2006 (14) ◽  
pp. 2329-2333
Author(s):  
Timothy Jamison ◽  
Timothy Heffron
Keyword(s):  
Lewis Acid ◽  
Ring Opening ◽  
Epoxide Ring ◽  
Epoxide Ring Opening ◽  
Directing Group

Epoxide ring-opening reaction promoted by ionic liquid reactivity: interplay of experimental and theoretical studies

2019 ◽  
Vol 9 (20) ◽  
pp. 5567-5571 ◽  
Author(s):  
Shengxin Chen ◽  
Guixiang Zeng ◽  
Yingwei Li ◽  
Bin He ◽  
Ruixia Liu ◽  
...  
Keyword(s):  
Ionic Liquid ◽  
Ionic Liquids ◽  
Propylene Oxide ◽  
Chemical Stability ◽  
Ring Opening ◽  
Epoxide Ring ◽  
Theoretical Studies ◽  
Epoxide Ring Opening ◽  
Ring Opening Reaction ◽  
Experimental And Theoretical Studies

Ionic liquids (ILs) have been widely introduced recently into the epoxide ring-opening reaction as catalysts or solvent without considering the chemical stability of ILs in propylene oxide (PO).

Epoxide ring opening with alcohols using heterogeneous Lewis acid catalysts: Regioselectivity and mechanism

2019 ◽  
Vol 370 ◽  
pp. 46-54 ◽  
Author(s):  
Nitish Deshpande ◽  
Aamena Parulkar ◽  
Rutuja Joshi ◽  
Brian Diep ◽  
Ambarish Kulkarni ◽  
...  
Keyword(s):  
Lewis Acid ◽  
Ring Opening ◽  
Epoxide Ring ◽  
Acid Catalysts ◽  
Lewis Acid Catalysts ◽  
Epoxide Ring Opening

scholarly journals STUDY OF EPOXIDE DECYCLISATION OF CARYOPHYLENE OXIDE WITH SYNTHETIC ZEOLITE AS CATALYSTS

2010 ◽  
Vol 4 (2) ◽  
pp. 94-98
Author(s):  
Winarto Haryadi ◽  
M. Muchalal
Keyword(s):  
Lewis Acid ◽  
Ring Opening ◽  
Secondary Alcohol ◽  
Synthetic Zeolite ◽  
Epoxide Ring ◽  
Bronsted Acid ◽  
Brønsted Acid ◽  
Epoxide Ring Opening ◽  
Brönsted Acid ◽  
Time Of Reaction

The reaction of epoxide ring opening of caryophillene oxide has been done using zeolite H-Y, H-sodalit, and H-ZSM-5 as catalysts. The reactions were done in two types, there were in dioxane solvent at temperature of 110 oC and without solvent at temperature of 175 oC. The catalyst weight was 10 % from caryophillene oxide weight, and the time of reaction was four hours. The product of reaction was analyzed using GC, FTIR, and GC-MS. The reactions of caryophillene oxide in dioxane solvent with the three kinds of zeolites did not give any targeted product. Whereas, the reactions without solvent gave three main products, there was one compound with one group of secondary hidroxyl (secondary alcohol), and two compounds of ketone from caryophillene. The reaction product of caryophillene oxide obtained without using solvent with the three type of catalysts were then compared. Conversion of three main products produced by H-ZSM-5 catalyst, H-sodalit catalyst and H-Y catalyst were 82.11 %, 54.92 % and 38.53 % respectively. For that reason, the transformation of caryophillene oxide using H-ZSM-5 catalyst was considered to be the best selective product. The alcohol product was resulted from reaction between caryophillene oxide and Bronsted acid, and  the ketone products was resulted from the reaction with Lewis acid in zeolite.   Keywords: Epoxide ring opening, HY, H-sodalit and HZSM-5

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