Studies on Cosolvency. V. Lewis Acid Character of Iodo Compounds in Enhancing the Solubility of Anthracene.in Hydrocarbon Solvents

1954 ◽  
Vol 58 (5) ◽  
pp. 417-421 ◽  
Author(s):  
G. R. Somayajulu ◽  
Santi R. Palit
Keyword(s):  
Lewis Acid ◽  
Hydrocarbon Solvents ◽  
Acid Character

Dimethylboric anhydride: a convenient preparation and full characterization

1969 ◽  
Vol 47 (4) ◽  
pp. 569-575 ◽  
Author(s):  
G. F. Lanthier ◽  
W. A. G. Graham
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Complex Formation ◽  
Lewis Acid ◽  
Complete Characterization ◽  
Full Characterization ◽  
Hydrolysis Of ◽  
Convenient Preparation ◽  
Reference Acid ◽  
Acid Character

Dimethylboric anhydride, (CH3)2BOB(CH3)2, has been prepared by limited hydrolysis of dimethylboron chloride and complete characterization has been carried out. The Lewis acid character of boron and the donor strength of oxygen have been studied using tensimetric and nuclear magnetic resonance techniques.Evidence for boron–oxygen π-bonding obtained from complex formation studies, using trimethylboron as a reference acid, is presented and discussed. The reduced acidity of the boron atoms, in comparison with trimethylboron, is discussed in terms of boron–oxygen π-bonding.

scholarly journals Alkaline-assisted stannation of beta zeolite as a scalable route to Lewis-acid catalysts for the valorisation of renewables

2016 ◽  
Vol 40 (5) ◽  
pp. 4136-4139 ◽  
Author(s):  
Pierre Y. Dapsens ◽  
Cecilia Mondelli ◽  
Javier Pérez-Ramírez
Keyword(s):  
Lewis Acid ◽  
Beta Zeolite ◽  
Acid Catalysts ◽  
Lewis Acid Catalysts ◽  
One Pot ◽  
Acid Character

Alkaline-assisted stannation comprises a scalable one-pot method to incorporate tin centres with a Lewis-acid character in beta zeolite for the isomerisation of renewables.

Macrotricyclic Borane—Amine Adducts: The First Uncharged Synthetic Host Compounds Without Lewis Acid Character, for Anionic Guests

1994 ◽  
Vol 33 (3) ◽  
pp. 327-329 ◽  
Author(s):  
Karin Worm ◽  
Franz P. Schmidtchen ◽  
Annette Schier ◽  
Andrea Schäfer ◽  
Manfred Hesse
Keyword(s):  
Lewis Acid ◽  
Amine Adducts ◽  
Acid Character

ChemInform Abstract: Preparation of n-Butyl(isopropyl)tin Dichloride and Its Lewis Acid Character.

ChemInform ◽  
2010 ◽  
Vol 22 (7) ◽  
pp. no-no
Author(s):  
V. BHUSHAN ◽  
K. L. GUPTA ◽  
G. C. SAXENA
Keyword(s):  
Lewis Acid ◽  
Acid Character

Switch‐On Diketopyrrolopyrrole‐Based Chemosensors for Cations Possessing Lewis Acid Character

2021 ◽  
Vol 16 (4) ◽  
pp. 355-362
Author(s):  
G. Dinesh Kumar ◽  
Marzena Banasiewicz ◽  
Denis Jacquemin ◽  
Daniel T. Gryko
Keyword(s):  
Lewis Acid ◽  
Acid Character

A combined kinetic and computational study of the reactions of transient germylenes with oxiranes and thiiranes in solution

2015 ◽  
Vol 93 (4) ◽  
pp. 435-444 ◽  
Author(s):  
Svetlana S. Kostina ◽  
William J. Leigh
Keyword(s):  
Steady State ◽  
Lewis Acid ◽  
Density Functional ◽  
Computational Study ◽  
Equilibrium Constants ◽  
Density Functional Theory Calculations ◽  
Laser Flash ◽  
Acid Base ◽  
Hydrocarbon Solvents ◽  
Complexation Reactions

The reactions of dimethyl- and diphenylgermylene (GeMe2 and GePh2, respectively) with cyclohexene oxide (CHO) and propylene sulfide (PrS) have been studied in hydrocarbon solvents at 25 °C by laser flash and steady-state photolysis methods using appropriately substituted germacyclopent-3-ene derivatives as germylene precursors. GeMe2 reacts with CHO and PrS with rate constants in the range of 1.2–1.7 × 1010 M−1 s−1 in hexanes at 25 °C to form new transient products that are assigned to the corresponding Lewis acid-base complexes of the germylene with the substrates. The complexation reactions were found to be reversible and are characterized by equilibrium constants of KC = (3.7 ± 0.8) × 103 M−1 and (3 ± 1) × 104 M−1 for complexation of GeMe2 with CHO and PrS, respectively. The complexes decay over approximately 10 μs with the concomitant formation of tetramethyldigermene (Ge2Me4), identifiable by its characteristic UV-vis spectrum centered at λmax = 370 nm. Diphenylgermylene behaves analogously, reacting rapidly and reversibly with the two substrates to form the corresponding Lewis acid-base complexes (λmax ≈ 355 nm) that decay over several tens of microseconds with the concomitant growth of the characteristic UV-vis spectrum of tetraphenyldigermene (Ge2Ph4) (λmax = 440 nm). Steady-state photolysis of the germylene precursors in the presence of CHO afforded germanium-containing oligomers but showed no evidence of oxygen abstraction or the formation of substrate-derived product(s). Similar photolyses in the presence of PrS also afforded germanium-containing oligomers, but as well yielded propene in 20%–30% yield and (in the case of the GePh2 precursor) minor amounts of low molecular weight compounds that appear to be derived from the corresponding germanethione. Density functional theory calculations of the chalcogen abstraction reactions of GeMe2 with oxirane and thiirane in the gas phase have been carried out at the B3LYP/6-311+G(d,p) level of theory and are in good qualitative agreement with the experimental data.

Lewis Acid Character of Zero-Valent Gold Nanoclusters under Aerobic Conditions: Intramolecular Hydroalkoxylation of Alkenes.

ChemInform ◽  
2007 ◽  
Vol 38 (42) ◽  
Author(s):  
Ikuyo Kamiya ◽  
Hironori Tsunoyama ◽  
Tatsuya Tsukuda ◽  
Hidehiro Sakurai
Keyword(s):  
Lewis Acid ◽  
Gold Nanoclusters ◽  
Aerobic Conditions ◽  
Acid Character
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