Highly Porous Pt2Ir Alloy Nanocrystals as a Superior Catalyst with High-Efficiency C–C Bond Cleavage for Ethanol Electrooxidation

2021 ◽  
pp. 6773-6780
Author(s):  
Yan Fang ◽  
Dongjie Cao ◽  
Yan Shi ◽  
Shiyu Guo ◽  
Qi Wang ◽  
...  
Keyword(s):  
High Efficiency ◽  
Bond Cleavage ◽  
Ethanol Electrooxidation ◽  
Alloy Nanocrystals ◽  
Highly Porous

scholarly journals Difluorocarbene enables to access 2-fluoroindoles from ortho-vinylanilines

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Jianke Su ◽  
Xinyuan Hu ◽  
Hua Huang ◽  
Yu Guo ◽  
Qiuling Song
Keyword(s):  
Fluorine Atom ◽  
High Efficiency ◽  
Addition Reaction ◽  
Bond Cleavage ◽  
Therapeutic Agents ◽  
Bioactive Molecules ◽  
General Strategy ◽  
Michael Addition Reaction ◽  
Fundamental Properties ◽  
Synthetic Approaches

Abstract2-Fluoroindoles as an important structural scaffold are widely existing in many bioactive or therapeutic agents. Despite their potential usefulness, efficient constructions of 2-fluoroindole derivatives are very sparce. The development of straightforward synthetic approaches to access 2-fluoroindoles is highly desirable for studying their fundamental properties and applications. Herein, we report an efficient and general strategy for the construction of 2-fluoroindoles in which a wide variety of 2-fluoroindoles were accessed with high efficiency and chemoselectivity. Instead of starting from indole skeletons, our strategy constructs indole scaffolds alongside the incorporation of fluorine atom on C2 position in a formal [4+1] cyclization from readily accessible ortho-vinylanilines and difluorocarbene. In our protocol, commercially accessible halodifluoroalkylative reagents provide one carbon and one fluorine atom by cleaving one C-N tertiary bond and forming one C-N bond and one C-C double bond with ortho-vinylanilines. Downstream transformations on 2-fluoroindoles lead to various valuable bioactive molecules which demonstrated significant synthetic advantages over previous reports. And mechanistic studies suggest that the reaction undergoes a cascade difluorocarbene-trapping and intramolecular Michael addition reaction followed by Csp3-F bond cleavage.

Facilitating the C–C bond cleavage on sub-10 nm concavity-tunable Rh@Pt core–shell nanocubes for efficient ethanol electrooxidation

2019 ◽  
Vol 7 (30) ◽  
pp. 17987-17994 ◽  
Author(s):  
Pingting Li ◽  
Kai Liu ◽  
Jinyu Ye ◽  
Fei Xue ◽  
Yong Cheng ◽  
...  
Keyword(s):  
Bond Cleavage ◽  
Core Shell ◽  
Ethanol Electrooxidation ◽  
Atomic Steps

Concavity-tunable Rh@Pt core–shell nanocubes with an engineered Rh–Pt interface and Pt atomic steps facilitate C–C bond cleavage in the EOR.

Novel three-dimensional macroporous PbO2 foam electrode for efficient electrocatalytic decolorization of dyes

RSC Advances ◽  
2015 ◽  
Vol 5 (109) ◽  
pp. 89363-89367 ◽  
Author(s):  
Tigang Duan ◽  
Ye Chen ◽  
Qing Wen ◽  
Yupeng Cong ◽  
Ying Duan ◽  
...  
Keyword(s):  
Organic Contaminants ◽  
High Efficiency ◽  
Three Dimensional ◽  
Porous Architecture ◽  
Binder Free ◽  
Highly Porous ◽  
Decolorization Of Dyes

3D macroporous PbO2 foam electrode possesses a binder-free and highly-porous architecture, and ensures a high efficiency for degrading organic contaminants.

Silver(i) NHC mediated C–C bond activation of alkyl nitriles and catalytic efficiency in oxazoline synthesis

2015 ◽  
Vol 51 (41) ◽  
pp. 8699-8701 ◽  
Author(s):  
Rachael Heath ◽  
Helge Müller-Bunz ◽  
Martin Albrecht
Keyword(s):  
High Efficiency ◽  
Bond Activation ◽  
Aldol Condensation ◽  
Bond Cleavage ◽  
Catalytic Efficiency ◽  
Carbene Complexes ◽  
Ambient Temperatures ◽  
Mild Conditions ◽  
New Applications

C–C bond cleavage is achieved with silver carbene species under relatively mild conditions (80 °C) stoichiometrically, and aldol condensation is catalyzed at ambient temperatures in high efficiency, with turnover numbers up to 5000 h−1, thus disclosing new applications and synthetic opportunities based on easily accessible silver carbene complexes.

On the Lack of Beneficial Role of Rh Towards C-C Bond Cleavage During Low Temperature Ethanol Electrooxidation on Pt-Rh Nanoalloys

2018 ◽  
Author(s):  
Justyna Piwowar ◽  
Adam Lewera
Keyword(s):  
Low Temperature ◽  
Electrode Potential ◽  
Ethanol Oxidation ◽  
Bond Cleavage ◽  
Ethanol Electrooxidation ◽  
Co Stripping ◽  
Beneficial Role ◽  
Bond Scission ◽  
Oxidation Of Ethanol

Numerous reports in scientific literature claim the increased activity of Rh-containing systems towards C-C bond scission in electrocatalytic oxidation of ethanol at ambient temperatures. Due to the claimed C-C bond breaking ability, Rh-containing systems are intensively investigated and widely recognized as the most promising candidates as anode materials for ethanol-feed low temperature fuel cells. This study aims at verifying the claim of beneficial role of Rh towards C-C bond scission during low temperature ethanol electrooxidation on Pt-Rh nanoparticles. We determined that the surface-normalized amounts of CO<sub>2 </sub>produced during ethanol oxidation are comparable on Pt, Rh and Pt-Rh nanoalloys, and smaller than CO<sub>2</sub> amounts obtained on exactly the same electrode from oxidation of monolayer of adsorbed CO. The whole amount of CO<sub>2</sub> detected during ethanol oxidation, regardless of Rh presence, or lack of thereof, seems to come exclusively from oxidation of submonolayer of CO<sub>ads</sub> produced during dissociative adsorption of ethanol at low electrode potential, and its subsequent oxidation at sufficiently high electrode potential. Our work suggest that Rh-containing alloys are not more active towards C-C bond scission than pure Pt, and on both metals the mechanism of oxidation of ethanol to CO<sub>2</sub> proceeds via the submonolayer of CO<sub>ads</sub>, which limits the quantity of CO<sub>2</sub> produced from ethanol at room temperature to negligible amount. The higher activity of Rh-containing materials towards C-C bond scission claimed in literature was determined to be due to overinterpretation of selectivity data.<br>To characterized the samples we used techniques like XPS, TEM, and cyclic voltammetry. For drove a conclusions we compere amount of CO<sub>2</sub> detected in DEMS during ethanol oxidation reaction and so called CO stripping experiment. <br><br>

Highly porous carbon from a natural cellulose fiber as high efficiency sorbent for lead in waste water

2017 ◽  
Vol 245 ◽  
pp. 296-299 ◽  
Author(s):  
Manikandan Ilangovan ◽  
Vijaykumar Guna ◽  
Sharon Olivera ◽  
Ashwini Ravi ◽  
H.B. Muralidhara ◽  
...  
Keyword(s):  
Waste Water ◽  
Porous Carbon ◽  
High Efficiency ◽  
Cellulose Fiber ◽  
Natural Cellulose ◽  
Highly Porous

Sulfuryl Fluoride Promoted Thiocyanation of Alcohols: A Practical Method for Preparing Thiocyanates

Synlett ◽  
2020 ◽  
Vol 31 (14) ◽  
pp. 1413-1417
Author(s):  
Chengrong Ding ◽  
Guofu Zhang ◽  
Lidi Xuan ◽  
Yiyong Zhao
Keyword(s):  
Ethyl Acetate ◽  
Functional Group ◽  
High Efficiency ◽  
Bond Cleavage ◽  
Ammonium Thiocyanate ◽  
Practical Method ◽  
Sulfuryl Fluoride ◽  
Mild Conditions ◽  
One Step ◽  
The One

A novel SO2F2-promoted thiocyanation method for the one-step synthesis of thiocyanates through C–O bond cleavage of readily available alcohols with ammonium thiocyanate as the thiocyanating agent was developed. The method avoids the use of additional catalyst, and a variety of (hetero)arene, alkene and aliphatic alcohols reacted with high efficiency in ethyl acetate under mild conditions to afford the corresponding thiocyanates in excellent to quantitative yields with broad functional-group compatibility.

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