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.

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 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

Metal-free pincer ligand chemistry polycationic phosphonium Lewis acids

2017 ◽  
Vol 46 (12) ◽  
pp. 3921-3928 ◽  
Author(s):  
Kevin M. Szkop ◽  
Douglas W. Stephan
Keyword(s):  
Lewis Acid ◽  
Lewis Acids ◽  
Acid Catalysts ◽  
Phosphonium Salts ◽  
Lewis Acid Catalysts ◽  
Pincer Ligand ◽  
Metal Free ◽  
Methyl Pyridine

Oxidation with or without subsequent methylation of the pyridine of 2,6-bis(diphenylphosphine)methyl pyridine affords di- and tricationic phosphonium salts. These species are used as Lewis acid catalysts for the dimerization of 1,1-diphenylethylene, the hydrodefluorination of 1-fluoroadamantane, and the dehydrocoupling of phenol and silane.

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.

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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