Pyridinium–phosphonium dications: highly electrophilic phosphorus-based Lewis acid catalysts

2016 ◽  
Vol 45 (14) ◽  
pp. 5949-5957 ◽  
Author(s):  
Julia M. Bayne ◽  
Michael H. Holthausen ◽  
Douglas W. Stephan
Keyword(s):  
Lewis Acid ◽  
Acid Catalysts ◽  
Lewis Acid Catalysts ◽  
Phosphonium Cations

Using commercially available 2-pyridyldiphenylphosphine (o-NC5H4)PPh2, a family of electrophilic phosphonium cations [(o-NC5H4)PFPh2]+ (2) and dications [(o-MeNC5H4)PRPh2]2+ (R = F (4); Me (5)) were prepared.

Air- and water-stable Lewis acids: synthesis and reactivity of P-trifluoromethyl electrophilic phosphonium cations

2018 ◽  
Vol 54 (6) ◽  
pp. 662-665 ◽  
Author(s):  
V. Fasano ◽  
J. H. W. LaFortune ◽  
J. M. Bayne ◽  
M. J. Ingleson ◽  
D. W. Stephan
Keyword(s):  
Lewis Acid ◽  
Lewis Acids ◽  
Acid Catalysts ◽  
Bronsted Acid ◽  
Lewis Acid Catalysts ◽  
Reaction Conditions ◽  
Brönsted Acid ◽  
And Function ◽  
Water Alcohol ◽  
Phosphonium Cations

Electrophilic phosphonium cations (EPCs) containing a –CF3 group are stable to air, water, alcohol and strong Brønsted acid and function as Lewis acid catalysts without requiring anhydrous reaction conditions.

Electrophilic phenoxy-substituted phosphonium cations

2016 ◽  
Vol 45 (45) ◽  
pp. 18156-18162 ◽  
Author(s):  
James H. W. LaFortune ◽  
Timothy C. Johnstone ◽  
Manuel Pérez ◽  
Daniel Winkelhaus ◽  
Vitali Podgorny ◽  
...  
Keyword(s):  
Lewis Acid ◽  
Acid Catalysts ◽  
Phosphonium Salts ◽  
Lewis Acid Catalysts ◽  
Phosphonium Cations

A family of electrophilic phenoxy-substituted phosphonium salts [(RO)P(C6F5)3][B(C6F5)4] (R = C6H5, 4-FC6H4, 2,4-F2C6H3, C6F5) have been synthesized, used as Lewis acid catalysts and their air stability was evaluated.

Electrophilic Phosphonium Cations as Lewis Acid Catalysts in Diels–Alder Reactions and Nazarov Cyclizations

2018 ◽  
Vol 37 (19) ◽  
pp. 3303-3313 ◽  
Author(s):  
Maria Vogler ◽  
Lars Süsse ◽  
James H. W. LaFortune ◽  
Douglas W. Stephan ◽  
Martin Oestreich
Keyword(s):  
Lewis Acid ◽  
Diels Alder ◽  
Acid Catalysts ◽  
Lewis Acid Catalysts ◽  
Nazarov Cyclizations ◽  
Phosphonium Cations

Ferrocenyl-derived electrophilic phosphonium cations (EPCs) as Lewis acid catalysts

2016 ◽  
Vol 45 (13) ◽  
pp. 5568-5574 ◽  
Author(s):  
Ian Mallov ◽  
Douglas W. Stephan
Keyword(s):  
Lewis Acid ◽  
Acid Catalysts ◽  
Lewis Acid Catalysts ◽  
Phosphonium Cations

Ferrocenyl-derived electrophilic phosphonium cations are catalysts for a series of reactions including the deoxygenation of a series of ketones.

Electrophilic phosphonium cations (EPCs) with perchlorinated-aryl substituents: towards air-stable phosphorus-based Lewis acid catalysts

2016 ◽  
Vol 45 (37) ◽  
pp. 14651-14657 ◽  
Author(s):  
Shawn Postle ◽  
Vitali Podgorny ◽  
Douglas W. Stephan
Keyword(s):  
Catalytic Activity ◽  
Lewis Acid ◽  
Acid Catalysts ◽  
Lewis Acid Catalysts ◽  
Phosphonium Cations

A series of fluorophosphonium cations incorporating (C6Cl5) substituents, [Ph2PF(C6Cl5)][B(C6F5)4] 8, [PhPF(C6Cl5)2][B(C6F5)4] 9, and [(C6F5)PF(C6Cl5)2][B(C6F5)4] 10, were prepared and tested for air stability and catalytic activity.

Hydrothermal synthesis of Sn-Beta zeolites in F−-free medium

2018 ◽  
Vol 5 (11) ◽  
pp. 2763-2771 ◽  
Author(s):  
Hao Xu ◽  
Xudong Wang ◽  
Peng Ji ◽  
Haihong Wu ◽  
Yejun Guan ◽  
...  
Keyword(s):  
Hydrothermal Synthesis ◽  
Lewis Acid ◽  
Crystal Size ◽  
Acid Catalysts ◽  
Free Medium ◽  
Lewis Acid Catalysts ◽  
Structure Directing Agent ◽  
Highly Active ◽  
Beta Zeolites

Sn-Beta zeolites, with high Sn content and smaller crystal size, hydrothermally synthesized in F−-free medium using N-cyclohexyl-N,N-dimethylcyclohexanaminium hydroxide as the structure-directing agent with the assistance of Na+ and seed, are highly active as Lewis acid catalysts.

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