scholarly journals Strong Affinity of Triazolium-Appended Dipyrromethenes (TADs) for BF4−

Molecules ◽  
2020 ◽  
Vol 25 (19) ◽  
pp. 4555
Author(s):  
Charles Guérin ◽  
Zhan Zhang ◽  
Ludivine Jean-Gérard ◽  
Stephan Steinmann ◽  
Carine Michel ◽  
...  
Keyword(s):  
Dft Calculations ◽  
Special Care ◽  
Strong Affinity ◽  
Weakly Coordinating ◽  
Weakly Coordinating Anion

Because BF4− is a labile, non- or weakly coordinating anion, it is generally chosen by chemists who do not want the anion to interfere with the associated cation. Herein, we demonstrate that BF4− actually strongly binds to triazole-appended dipyrromethenes (TADs). In particular, HETCOR NMR experiments and DFT calculations were used to rationalize the results observed with anion titrations. Hence, special care should be taken when considering that BF4− is innocent.

Mono(arene) Complexes of Thallium(I) Supported by a Weakly Coordinating Anion

2007 ◽  
Vol 26 (7) ◽  
pp. 1811-1815 ◽  
Author(s):  
Yann Sarazin ◽  
Nikolas Kaltsoyannis ◽  
Joseph A. Wright ◽  
Manfred Bochmann
Keyword(s):  
Arene Complexes ◽  
Weakly Coordinating ◽  
Weakly Coordinating Anion

C–H Functionalization Reactions of Phenyl and Vinyl Carbocations Paired with Weakly Coordinating Anions

Synlett ◽  
2020 ◽  
Vol 31 (19) ◽  
pp. 1851-1856
Author(s):  
Hosea M. Nelson ◽  
Stasik Popov ◽  
Brian Shao ◽  
Alex L. Bagdasarian ◽  
Benjamin Wigman
Keyword(s):  
High Energy ◽  
Mechanistic Studies ◽  
Insertion Reactions ◽  
Weakly Coordinating Anions ◽  
Recent Developments ◽  
Weakly Coordinating ◽  
Weakly Coordinating Anion

Carbocations have played a central role in the chemical sciences for over a century. In a synthetic setting, most methods utilize stabilized tricoordinate carbocations, while there are far fewer examples of reactions featuring nonstabilized dicoordinate cations. Here, we provide an overview of recent developments in the generation of high-energy carbocations mediated by weakly coordinating anions and the C–H insertion reactions of such carbocations. Moreover, we discuss mechanistic studies of these catalytic C–H insertion reactions aimed at furthering our understanding of the reactive nature of these rarely invoked cationic intermediates.1 Introduction2 Background: Phenyl Carbocations3 Silylium/Carborane-Catalyzed C–H Insertion Reactions of Phenyl Carbocations4 Silane-Fueled, Weakly Coordinating Anion-Catalyzed, Reductive C–H Insertion Reactions of Vinyl Carbocations5 C–H Insertion Reactivity of Vinyl Carbocations under Basic Conditions6 Conclusion and Outlook

Two phosphaalkene radical cations with inverse spin density distributions

2015 ◽  
Vol 44 (34) ◽  
pp. 15099-15102 ◽  
Author(s):  
Xiaobo Pan ◽  
Xingyong Wang ◽  
Zaichao Zhang ◽  
Xinping Wang
Keyword(s):  
Spin Density ◽  
Radical Cations ◽  
Density Distributions ◽  
Weakly Coordinating ◽  
Weakly Coordinating Anion

Two phosphaalkene radical cations have been made by using a weakly coordinating anion, and they exhibit inverse spin density distributions.

Crystallographic evidence for structural diversity in cationic (tripyrrinato)cobalt(II) complexes

2005 ◽  
Vol 09 (10) ◽  
pp. 683-690 ◽  
Author(s):  
Martin Bröring ◽  
Carsten D. Brandt ◽  
Silke Köhler ◽  
Maximilian Sieber
Keyword(s):  
Single Crystals ◽  
Anion Exchange ◽  
Structural Diversity ◽  
Complete Characterization ◽  
Donor Ligands ◽  
Highly Sensitive ◽  
Weakly Coordinating ◽  
Weakly Coordinating Anion ◽  
Coordinate Structures

Cobalt(II) complexes of tripyrrin ligands can be transformed into cations by anion exchange using NaBAr F , a salt of a weakly coordinating anion. The complete characterization of these highly sensitive cations (probably solvate complexes) could not be achieved, but the coordination to donor ligands like nitriles or trialkylphosphanes stabilizes the cations sufficiently for the isolation of some single crystals. As the structural analyses of these donor-stabilized cobalt(II) tripyrrins reveal, either four- or five coordinate structures are formed depending on the type and size of ligand used.

scholarly journals Al(ORF)3 (RF = C(CF3)3) activated silica: a well-defined weakly coordinating surface anion

2020 ◽  
Vol 11 (6) ◽  
pp. 1510-1517 ◽  
Author(s):  
Damien B. Culver ◽  
Amrit Venkatesh ◽  
Winn Huynh ◽  
Aaron J. Rossini ◽  
Matthew P. Conley
Keyword(s):  
Lewis Acid ◽  
Strong Acid ◽  
Strong Lewis Acid ◽  
Weakly Coordinating ◽  
Weakly Coordinating Anion

A strong Lewis acid coordinates to silanols on silica to form a strong acid, which acts as a weakly coordinating anion when deprotonated.

Strong Bases and Weak Anions in Catalytic C–H Insertion Reactions of Vinyl Carbocations

2018 ◽  
Author(s):  
Benjamin Wigman ◽  
Stasik Popov ◽  
Alex L. Bagdasarian ◽  
Brian Shao ◽  
Tyler R. Benton ◽  
...  
Keyword(s):  
High Energy ◽  
Insertion Reactions ◽  
Catalytically Active ◽  
Vinyl Cation ◽  
Lithium Hexamethyldisilazide ◽  
Weakly Coordinating ◽  
Weakly Coordinating Anion ◽  
Surprising Discovery

<p>Here we report the surprising discovery that high-energy vinyl carbocations can be generated under strongly basic conditions, and that they engage in intramolecular sp3 C–H insertion reactions through the catalysis of commercially available weakly coordinating anion salts. This approach relies on the unconventional combination of lithium hexamethyldisilazide base and the commercially available catalyst, triphenylmethylium tetrakis(pentafluorophenyl)borate. These reagents form a catalytically active lithium species that enables the application of vinyl cation C–H insertion reactions to heteroatomcontaining substrates.</p>

Formation and stabilization of five-coordinate iron(II) verdoheme analogues by axial weakly coordinating anion ligation. X-ray crystal structures of [(OEOPFe)2O](X)2 (X=AsF6, SbF6)

2007 ◽  
Vol 360 (7) ◽  
pp. 2331-2338 ◽  
Author(s):  
Mozhgan Khorasani-Motlagh ◽  
Nasser Safari ◽  
Meissam Noroozifar ◽  
Hashem Shahroosvand ◽  
Zohreh Parsaii ◽  
...  
Keyword(s):  
Crystal Structures ◽  
X Ray ◽  
Weakly Coordinating ◽  
Weakly Coordinating Anion
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