scholarly journals Defluorosilylation of trifluoromethane: upgrading an environmentally damaging fluorocarbon

2020 ◽  
Vol 56 (85) ◽  
pp. 12929-12932
Author(s):  
Daniel J. Sheldon ◽  
Greg Coates ◽  
Mark R. Crimmin
Keyword(s):  
Greenhouse Gas ◽  
Room Temperature

The rapid, room-temperature defluorosilylation of trifluoromethane, a highly potent greenhouse gas, has been achieved using a simple silyl lithium reagent.

scholarly journals Defluorosilylation of Trifluoromethane: Upgrading an Environmentally Damaging Fluorocarbon

2020 ◽  
Author(s):  
Daniel Sheldon ◽  
Greg Coates ◽  
Mark Crimmin
Keyword(s):  
Greenhouse Gas ◽  
Building Block ◽  
Room Temperature ◽  
Reaction Pathway ◽  
Active Pharmaceutical Ingredients ◽  
Pharmaceutical Ingredients ◽  
Mechanistic Analysis

<p>The rapid, room-temperature defluorosilylation of trifluoromethane, a highly potent greenhouse gas, has been achieved using a simple silyl lithium reagent. An extensive computational mechanistic analysis provides a viable reaction pathway and demonstrates the unexpected electrophilic nature of LiCF<sub>3</sub>. The reaction generates a bench stable fluorinated building block that shows promise as an easy-to-use difluoromethylating agent. The difluoromethyl group is an increasingly important bioisostere in active pharmaceutical ingredients, and therefore our methodology creates value from waste. The potential scalability of the process has been demonstrated by achieving the reaction on a gram-scale.</p>

scholarly journals Electrochemically generated bimetallic reductive mediator Cu1+[Ni2+(CN)4]1− for the degradation of CF4 to ethanol by electro-scrubbing

2018 ◽  
Vol 36 (11) ◽  
pp. 1043-1048 ◽  
Author(s):  
G Muthuraman ◽  
AG Ramu ◽  
YH Cho ◽  
EJ McAdam ◽  
IS Moon
Keyword(s):  
Fourier Transform ◽  
Electron Spin Resonance ◽  
Greenhouse Gas ◽  
Electrochemical Reduction ◽  
Removal Efficiency ◽  
Electron Spin ◽  
Room Temperature ◽  
Solution Phase ◽  
Bimetallic Complex ◽  
Spin Resonance

Remediation of electronic gas CF4 using commercially available technologies results in another kind of greenhouse gas and corrosive side products. This investigation aimed to develop CF4 removal at room temperature with formation of useful product by attempting an electrogenerated Cu1+[Ni2+(CN)4]1− mediator. The initial electrolysis of the bimetallic complex at the anodized Ti cathode demonstrated Cu1+[Ni2+(CN)4]1− formation, which was confirmed by additional electron spin resonance results. The degradation of CF4 followed mediated electrochemical reduction by electrogenerated Cu1+[Ni2+(CN)4]1−. The removal efficiency of CF4 of 95% was achieved by this electroscrubbing process at room temperature. The spectral results of online and offline Fourier transform infrared analyzer, either in gas or in solution phase, demonstrated that the product formed during the removal of CF4 by electrogenerated Cu1+[Ni2+(CN)4]1− by electroscrubbing was ethanol (CH3CH2OH), with a small amount of trifluoroethane (CF3CH3) intermediate.

Highly selective sorption of CO2 and N2O and strong gas-framework interactions in a nickel(ii) organic material

2016 ◽  
Vol 4 (41) ◽  
pp. 16198-16204 ◽  
Author(s):  
Xiaoping Zhang ◽  
Wenjie Chen ◽  
Wei Shi ◽  
Peng Cheng
Keyword(s):  
Greenhouse Gas ◽  
Organic Material ◽  
Room Temperature ◽  
Gas Adsorption ◽  
Selective Sorption

A new robust microporous Ni MOF shows excellent greenhouse gas adsorption capabilities as well as high separations of CO2 and N2O over N2/O2/CH4/H2/Ar/He at room temperature.

scholarly journals Complete Deconstruction of SF6 by an Aluminium(I) Compound

2021 ◽  
Author(s):  
Daniel Sheldon ◽  
Mark Crimmin
Keyword(s):  
Greenhouse Gas ◽  
Room Temperature ◽  
Reaction Sequence ◽  
Organic Products ◽  
Temperature Activation ◽  
Net Transfer

<b>The room-temperature activation of SF<sub>6</sub>, a potent greenhouse gas, is reported using a monovalent aluminium(I) reagent to form well-defined aluminium(III) fluoride and aluminium(III) sulfide products. New reactions have been developed to utilise the aluminium(III) fluoride and aluminium(III) sulfide as a nucleophilic source of F<sup>–</sup> and S<sup>2– </sup>for a range of electrophiles. The overall reaction sequence results in the net transfer of fluorine or sulfur atoms from an environmentally detrimental gas to useful organic products.</b>

scholarly journals Complete Deconstruction of SF6 by an Aluminium(I) Compound

2021 ◽  
Author(s):  
Daniel James Sheldon ◽  
Mark Richard Crimmin
Keyword(s):  
Greenhouse Gas ◽  
Room Temperature ◽  
Temperature Activation

The room-temperature activation of SF6, a potent greenhouse gas, is reported using a monovalent aluminium(I) reagent to form well-defined aluminium(III) fluoride and aluminium(III) sulfide products. New reactions have been developed...

scholarly journals Complete Deconstruction of SF6 by an Aluminium(I) Compound

2021 ◽  
Author(s):  
Daniel Sheldon ◽  
Mark Crimmin
Keyword(s):  
Greenhouse Gas ◽  
Room Temperature ◽  
Reaction Sequence ◽  
Organic Products ◽  
Temperature Activation ◽  
Net Transfer

<b>The room-temperature activation of SF<sub>6</sub>, a potent greenhouse gas, is reported using a monovalent aluminium(I) reagent to form well-defined aluminium(III) fluoride and aluminium(III) sulfide products. New reactions have been developed to utilise the aluminium(III) fluoride and aluminium(III) sulfide as a nucleophilic source of F<sup>–</sup> and S<sup>2– </sup>for a range of electrophiles. The overall reaction sequence results in the net transfer of fluorine or sulfur atoms from an environmentally detrimental gas to useful organic products.</b>

scholarly journals Defluorosilylation of Trifluoromethane: Upgrading an Environmentally Damaging Fluorocarbon

2020 ◽  
Author(s):  
Daniel Sheldon ◽  
Greg Coates ◽  
Mark Crimmin
Keyword(s):  
Greenhouse Gas ◽  
Building Block ◽  
Room Temperature ◽  
Reaction Pathway ◽  
Active Pharmaceutical Ingredients ◽  
Pharmaceutical Ingredients ◽  
Mechanistic Analysis

<p>The rapid, room-temperature defluorosilylation of trifluoromethane, a highly potent greenhouse gas, has been achieved using a simple silyl lithium reagent. An extensive computational mechanistic analysis provides a viable reaction pathway and demonstrates the unexpected electrophilic nature of LiCF<sub>3</sub>. The reaction generates a bench stable fluorinated building block that shows promise as an easy-to-use difluoromethylating agent. The difluoromethyl group is an increasingly important bioisostere in active pharmaceutical ingredients, and therefore our methodology creates value from waste. The potential scalability of the process has been demonstrated by achieving the reaction on a gram-scale.</p>

Dependence of Intergranular Fracture on Boundary Topography and Cohesion

1973 ◽  
Vol 31 ◽  
pp. 150-151
Author(s):  
J. E. Doherty ◽  
A. F. Giamei ◽  
B. H. Kear ◽  
C. W. Steinke
Keyword(s):  
Grain Boundary ◽  
Room Temperature ◽  
Nickel Base Superalloy ◽  
Boundary Shear ◽  
Room Temperature Ductility ◽  
Solid Solution Matrix ◽  
Nickel Base ◽  
Solution Matrix ◽  
Different Levels ◽  
Base Superalloy

Recently we have been investigating a class of nickel-base superalloys which possess substantial room temperature ductility. This improvement in ductility is directly related to improvements in grain boundary strength due to increased boundary cohesion through control of detrimental impurities and improved boundary shear strength by controlled grain boundary micros true tures.For these investigations an experimental nickel-base superalloy was doped with different levels of sulphur impurity. The micros tructure after a heat treatment of 1360°C for 2 hr, 1200°C for 16 hr consists of coherent precipitates of γ’ Ni3(Al,X) in a nickel solid solution matrix.

Hepatocyte Alterations in Guinea Pigs FED Polychlorinated Biphenyls (PCBs), Dibenzodioxins (PCDD), AND DIBENZOFURANS (PCDF)

1982 ◽  
Vol 40 ◽  
pp. 56-57
Author(s):  
J. N. Turner ◽  
D. N. Collins
Keyword(s):  
Guinea Pigs ◽  
Room Temperature ◽  
Dose Group ◽  
Methyl Cellulose ◽  
Uranyl Acetate ◽  
Target Organ ◽  
Office Building ◽  
Lead Citrate ◽  
Control Groups ◽  
Cooling Fluid

A fire involving an electric service transformer and its cooling fluid, a mixture of PCBs and chlorinated benzenes, contaminated an office building with a fine soot. Chemical analysis showed PCDDs and PCDFs including the highly toxic tetra isomers. Guinea pigs were chosen as an experimental animal to test the soot's toxicity because of their sensitivity to these compounds, and the liver was examined because it is a target organ. The soot was suspended in 0.75% methyl cellulose and administered in a single dose by gavage at levels of 1,10,100, and 500mgm soot/kgm body weight. Each dose group was composed of 6 males and 6 females. Control groups included 12 (6 male, 6 female) animals fed activated carbon in methyl cellulose, 6 males fed methyl cellulose, and 16 males and 10 females untreated. The guinea pigs were sacrificed at 42 days by suffocation in CO2. Liver samples were immediately immersed and minced in 2% gluteraldehyde in cacadylate buffer at pH 7.4 and 4°C. After overnight fixation, samples were postfixed in 1% OsO4 in cacodylate for 1 hr at room temperature, embedded in epon, sectioned and stained with uranyl acetate and lead citrate.

Domain Formation in Synthetic Quartz

1971 ◽  
Vol 29 ◽  
pp. 156-157
Author(s):  
Joseph J. Comer
Keyword(s):  
Electron Beam ◽  
Room Temperature ◽  
Domain Formation ◽  
Synthetic Quartz ◽  
Transmission Electron ◽  
Black Spots ◽  
Diffraction Mode ◽  
Domain Boundaries ◽  
Kikuchi Lines ◽  
Straight Lines

Domains visible by transmission electron microscopy, believed to be Dauphiné inversion twins, were found in some specimens of synthetic quartz heated to 680°C and cooled to room temperature. With the electron beam close to parallel to the [0001] direction the domain boundaries appeared as straight lines normal to <100> and <410> or <510> directions. In the selected area diffraction mode, a shift of the Kikuchi lines was observed when the electron beam was made to traverse the specimen across a boundary. This shift indicates a change in orientation which accounts for the visibility of the domain by diffraction contrast when the specimen is tilted. Upon exposure to a 100 KV electron beam with a flux of 5x 1018 electrons/cm2sec the boundaries are rapidly decorated by radiation damage centers appearing as black spots. Similar crystallographio boundaries were sometimes found in unannealed (0001) quartz damaged by electrons.

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