First Example of a Highly Enantioselective Catalytic Protonation of Silyl Enol Ethers Using a Novel Lewis Acid-Assisted Brønsted Acid System

1996 ◽  
Vol 118 (50) ◽  
pp. 12854-12855 ◽  
Author(s):  
Kazuaki Ishihara ◽  
Shingo Nakamura ◽  
Masanobu Kaneeda ◽  
Hisashi Yamamoto
Keyword(s):  
Lewis Acid ◽  
Bronsted Acid ◽  
Acid System ◽  
Brønsted Acid ◽  
Enol Ethers ◽  
Silyl Enol Ethers ◽  
Brönsted Acid

Brønsted acid mediated N–O bond cleavage for α-amination of ketones through the aromatic nitroso aldol reaction

2016 ◽  
Vol 52 (15) ◽  
pp. 3215-3218 ◽  
Author(s):  
Isai Ramakrishna ◽  
Harekrishna Sahoo ◽  
Mahiuddin Baidya
Keyword(s):  
Bond Cleavage ◽  
Aldol Reaction ◽  
Nitroso Compounds ◽  
Bronsted Acid ◽  
Brønsted Acid ◽  
Enol Ethers ◽  
Silyl Enol Ethers ◽  
Brönsted Acid ◽  
Aromatic Nitroso Compounds

A Brønsted acid mediated N–O bond cleavage for α-amination of ketones has been developed through the nitroso aldol reaction of less-reactive aromatic nitroso compounds and silyl enol ethers having a disilane (–SiMe2TMS) backbone.

Enantioselective Protonation of Silyl Enol Ethers Catalyzed by a Chiral Pentacarboxycyclopentadiene-Based Brønsted Acid

Synlett ◽  
2019 ◽  
Vol 30 (11) ◽  
pp. 1317-1320 ◽  
Author(s):  
Jun Li ◽  
Shaoyu An ◽  
Chao Yuan ◽  
Pingfan Li
Keyword(s):  
Acid Catalyst ◽  
Bronsted Acid ◽  
Brønsted Acid ◽  
Enol Ethers ◽  
Silyl Enol Ethers ◽  
Brönsted Acid ◽  
Brønsted Acid Catalyst ◽  
Proton Source ◽  
Aryl Ketones ◽  
Chiral Bronsted Acid

The enantioselective protonation of silyl enol ethers was realized in the presence of a pentacarboxycyclopenta-1,3-diene-based chiral Brønsted acid catalyst with water as an achiral proton source to give the corresponding α-aryl ketones in good yields and up to 75% ee.

scholarly journals Tailoring Lewis/Brønsted acid properties of MOF nodes via hydrothermal and solvothermal synthesis: simple approach with exceptional catalytic implications

2021 ◽  
Author(s):  
Sergio Rojas-Buzo ◽  
Benjamin Bohigues ◽  
Christian W. Lopes ◽  
Débora M. Meira ◽  
Mercedes Boronat ◽  
...  
Keyword(s):  
Lewis Acid ◽  
Active Site ◽  
Solvothermal Synthesis ◽  
Simple Approach ◽  
Organic Reactions ◽  
Bronsted Acid ◽  
Brønsted Acid ◽  
Acid Properties ◽  
Brönsted Acid

The Brønsted/Lewis acid properties of Hf-MOF-808 can be tuned by simply controlling the solvent employed in its synthesis, with direct catalytic implications on the activity and selectivity of organic reactions sensitive to the active site nature.

Study on the removal and depolymerization of lignin from corn stover through the synergistic effect of Brønsted acid, Lewis acid and hydrogenation sites

Fuel ◽  
2021 ◽  
Vol 305 ◽  
pp. 121509
Author(s):  
Baikai Zhang ◽  
Wenzhi Li ◽  
Tingwei Zhang ◽  
Xu Li ◽  
Ajibola T. Ogunbiyi ◽  
...  
Keyword(s):  
Synergistic Effect ◽  
Corn Stover ◽  
Lewis Acid ◽  
Bronsted Acid ◽  
Brønsted Acid ◽  
Brönsted Acid

Critical role of Bronsted acid in Lewis-acid-catalyzed synthesis of Amadori and Heyns compounds of β-amino acids

2021 ◽  
pp. 1-11
Author(s):  
Debasree Chanda ◽  
Gangothri M. Venkataswamy ◽  
Lagamawwa V. Hipparagi ◽  
Nanishankar V. Harohally
Keyword(s):  
Amino Acids ◽  
Lewis Acid ◽  
Critical Role ◽  
Bronsted Acid ◽  
Brønsted Acid ◽  
Brönsted Acid ◽  
Acid Catalyzed
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