Detailed Electrochemical Analysis of the Redox Chemistry of Tetrafluorotetracyanoquinodimethane TCNQF4, the Radical Anion [TCNQF4]•–, and the Dianion [TCNQF4]2–in the Presence of Trifluoroacetic Acid

2011 ◽  
Vol 83 (17) ◽  
pp. 6731-6737 ◽  
Author(s):  
Thanh Hai Le ◽  
Ayman Nafady ◽  
Xiaohu Qu ◽  
Lisandra L. Martin ◽  
Alan M. Bond
Keyword(s):  
Trifluoroacetic Acid ◽  
Radical Anion ◽  
Redox Chemistry ◽  
Electrochemical Analysis

Zinc catechin complexes in aprotic medium. Redox chemistry and interaction with superoxide radical anion

Polyhedron ◽  
2001 ◽  
Vol 20 (9-10) ◽  
pp. 1005-1009 ◽  
Author(s):  
Mario E. Bodini ◽  
M.A. del Valle ◽  
R. Tapia ◽  
F. Leighton ◽  
P. Berrios
Keyword(s):  
Radical Anion ◽  
Superoxide Radical ◽  
Redox Chemistry ◽  
Superoxide Radical Anion ◽  
Aprotic Medium

Formation and Trapping of the Thermodynamically Unfavoured Inverted-Hemicucurbit[6]uril

2019 ◽  
Author(s):  
Elena Prigorchenko ◽  
Sandra Kaabel ◽  
Triin Narva ◽  
Anastassia Baškir ◽  
Maria Fomitšenko ◽  
...  
Keyword(s):  
Complex Formation ◽  
Combinatorial Chemistry ◽  
Trifluoroacetic Acid ◽  
Chloride Anion ◽  
Binding Affinities ◽  
Dynamic Covalent Chemistry ◽  
Reaction Selectivity ◽  
Low Concentration ◽  
Dynamic Combinatorial Chemistry ◽  
First Time

Amplification of a thermodynamically unfavoured macrocyclic product through the directed shift of the equilibrium between dynamic covalent chemistry library members is difficult to achieve. We show for the first time that during condensation of formaldehyde and <i>cis</i>-<i>N,N'</i>-cyclohexa-1,2-diylurea formation of <i>inverted-cis</i>-cyclohexanohemicucurbit[6]uril (<i>i-cis</i>-cycHC[6]) can be induced at the expense of thermodynamically favoured <i>cis</i>-cyclohexanohemicucurbit[6]uril (<i>cis</i>-cycHC[6]). The formation of <i>i-cis-</i>cycHC[6] is enhanced in low concentration of the templating chloride anion and suppressed in excess of this template. We found that reaction selectivity is governed by the solution-based template-aided dynamic combinatorial chemistry and continuous removal of the formed cycHC[6] macrocycles from the equilibrating solution by precipitation. Notably, the <i>i-cis</i>-cycHC[6] was isolated with 33% yield. Different binding affinities of three diastereomeric <i>i-cis</i>-, <i>cis</i>-cycHC[6] and their chiral isomer (<i>R,R</i>)-cycHC[6] for trifluoroacetic acid demonstrate the influence of macrocycle geometry on complex formation.

ipso-Nitration of Arylboronic Acids with Copper Nitrate and Trifluoroacetic Acid

2018 ◽  
Vol 15 (10) ◽  
pp. 891-894 ◽  
Author(s):  
Zhu-Qing Wang ◽  
Meng-Ping Guo ◽  
Yong-Ju Wen ◽  
Xiu-Li Shen ◽  
Mei-Yun Lv ◽  
...  
Keyword(s):  
Trifluoroacetic Acid ◽  
Copper Nitrate ◽  
Arylboronic Acids
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