An Acidity Scale for Brönsted Acids Including H3PW12O40

1997 ◽  
Vol 119 (33) ◽  
pp. 7702-7710 ◽  
Author(s):  
Russell S. Drago ◽  
José A. Dias ◽  
Thomas O. Maier
Keyword(s):  
Bronsted Acids ◽  
Acidity Scale

A Comprehensive Self-Consistent Spectrophotometric Acidity Scale of Neutral Brønsted Acids in Acetonitrile

2006 ◽  
Vol 71 (7) ◽  
pp. 2829-2838 ◽  
Author(s):  
Agnes Kütt ◽  
Ivo Leito ◽  
Ivari Kaljurand ◽  
Lilli Sooväli ◽  
Vladislav M. Vlasov ◽  
...  
Keyword(s):  
Bronsted Acids ◽  
Self Consistent ◽  
Acidity Scale

Spectrophotometric Acidity Scale of Strong Neutral Brønsted Acids in Acetonitrile

1998 ◽  
Vol 63 (22) ◽  
pp. 7868-7874 ◽  
Author(s):  
Ivo Leito ◽  
Ivari Kaljurand ◽  
Ilmar A. Koppel ◽  
Lev M. Yagupolskii ◽  
Vladislav M. Vlasov
Keyword(s):  
Bronsted Acids ◽  
Acidity Scale

Acidity scale for strong Bronsted acids referred to their complexes with water and in the Gaseous phase

1976 ◽  
Vol 42 (3) ◽  
pp. 213-222 ◽  
Author(s):  
Michel Fournier ◽  
Antoine Potier ◽  
Marcel Allavena
Keyword(s):  
Gaseous Phase ◽  
Bronsted Acids ◽  
Acidity Scale

One-Pot Synthesis and Conformational Analysis of 6-Membered Cyclic Iodonium Salts

2020 ◽  
Author(s):  
Lucien Caspers ◽  
Julian Spils ◽  
Mattis Damrath ◽  
Enno Lork ◽  
Boris Nachtsheim
Keyword(s):  
Conformational Analysis ◽  
Bronsted Acids ◽  
One Pot ◽  
Benzyl Alcohols ◽  
Iodonium Salts ◽  
Efficient Approach ◽  
One Pot Synthesis ◽  
Diaryliodonium Salts

In this article we describe an efficient approach for the synthesis of cyclic diaryliodonium salts. The method is based on benzyl alcohols as starting materials and consists of an Friedel-Crafts-arylation/oxidation sequence. Besides a deep optimization, particluar focusing on the choice and ratios of the utilized Bronsted-acids and oxidants, we explore the substrate scope of this transformation. We also discuss an interesting isomerism of cyclic iodonium salts substituted with aliphatic substituents at the bridge head carbon. <br>

scholarly journals Recent Advances in Transition-Metal-Free (4+3)-Annulations

Synthesis ◽  
2021 ◽  
Author(s):  
Heather Lam ◽  
Mark Lautens ◽  
Xavier Abel-Snape ◽  
Martin F. Köllen
Keyword(s):  
Transition Metal ◽  
Boronic Acid ◽  
Lewis Acids ◽  
Acid Catalysis ◽  
Heterocyclic Carbenes ◽  
Bronsted Acids ◽  
Metal Free ◽  
Previous Review ◽  
Dual Activation ◽  
Metal Catalyzed

Abstract(4+3)-Annulations are incredibly versatile reactions which combine a 4-atom synthon and a 3-atom synthon to form both 7-membered carbocycles as well as heterocycles. We have previously reviewed transition-metal-catalyzed (4+3)-annulations. In this review, we will cover examples involving bases, NHCs, phosphines, Lewis and Brønsted acids as well as some rare examples of boronic acid catalysis and photocatalysis. In analogy to our previous review, we exclude annulations involving cyclic dienes like furan, pyrrole, cyclohexadiene or cyclopentadiene, as Chiu, Harmata, Fernándes and others have recently published reviews encompassing such substrates. We will however discuss the recent additions (2010–2020) to the literature on (4+3)-annulations involving other types of 4-atom-synthons.1 Introduction2 Bases3 Annulations Using N-Heterocyclic Carbenes3.1 N-Heterocyclic Carbenes (NHCs)3.2 N-Heterocyclic Carbenes and Base Dual-Activation4 Phosphines5 Acids5.1 Lewis Acids5.2 Brønsted Acids6 Boronic Acid Catalysis and Photocatalysis7 Conclusion

Enantioselective Bromocyclization of Tryptamines Induced by Chiral Co(III)-Complex-Templated Brønsted Acids under an Air Atmosphere

2018 ◽  
Vol 83 (12) ◽  
pp. 6815-6823 ◽  
Author(s):  
Kun Liu ◽  
Hua-Jie Jiang ◽  
Na Li ◽  
Hui Li ◽  
Jing Wang ◽  
...  
Keyword(s):  
Bronsted Acids ◽  
Air Atmosphere

An acidity scale, [H+]hv, for proton quenching of excited states

1989 ◽  
Vol 67 (2) ◽  
pp. 227-238 ◽  
Author(s):  
J. A. Pincock ◽  
P. R. Redden
Keyword(s):  
Excited State ◽  
Fluorescence Quenching ◽  
Excited States ◽  
Benzyl Alcohols ◽  
Fluorescent Indicator ◽  
Quenching Of Fluorescence ◽  
Acidity Scale

An acidity scale for excited state protonation kinetics in 20% ethanol:80% aqueous sulfuric has been developed using 1-cyano-naphthalene as a fluorescent indicator. The utility of this new scale is demonstrated using the proton quenching of fluorescence of a variety of chromophores. These include 1- and 2-cyanonaphthalenes, 1- and 2-methoxynaphthalenes, benzyl alcohols, toluenes, and 2-vinylnaphthalene. Keywords: acidity scale, fluorescence quenching, excited state basicity.

Enantioselective oxysulfenylation and oxyselenenylation of olefins catalyzed by chiral Brønsted acids

Tetrahedron ◽  
2012 ◽  
Vol 68 (12) ◽  
pp. 2728-2735 ◽  
Author(s):  
Huan Guan ◽  
Haining Wang ◽  
Deshun Huang ◽  
Yian Shi
Keyword(s):  
Bronsted Acids ◽  
Chiral Brønsted Acids
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