Lewis acid strength and nuclear magnetic resonance measurements

1969 ◽  
pp. 110 ◽  
Author(s):  
D. P. N. Satchell ◽  
R. S. Satchell
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Lewis Acid ◽  
Acid Strength ◽  
Nuclear Magnetic

Polar trifluoromethylation reactions: the formation of bis(trifluoromethyl)iodine(III) compounds and trifluoromethyl iodine(III) cations and anions

1991 ◽  
Vol 69 (2) ◽  
pp. 327-333 ◽  
Author(s):  
Wieland Tyrra ◽  
Dieter Naumann
Keyword(s):  
Nuclear Magnetic Resonance ◽  
New Species ◽  
Magnetic Resonance ◽  
Magnetic Resonance Spectroscopy ◽  
Key Words ◽  
Lewis Acid ◽  
Group Formation ◽  
Resonance Spectroscopy ◽  
By Products ◽  
Nuclear Magnetic

IX3 (X = Cl, OCOCF3, ONO2) reacts with Cd(CF3)2 complexes or Bi(CF3)3 to yield the corresponding CF3IX2 derivatives. 19F nuclear magnetic resonance spectroscopic evidence is found for [I(CF3)2]+ and I(CF3)2X (X = Cl, OCOCF3) in the reactions of CF3IX2 with Cd(CF3)2 complexes. During the reaction of CF3IF2 and Hg(CF3)2 the new species I(CF3)2F and cis-[I(CF3)2F2]− are identified by nuclear magnetic resonance spectroscopy. The reactions proceed under polar conditions and can be accelerated by the addition of a Lewis acid such as BF3, B(OCOCF3)3, or Sb(V) compounds. Difluoromethyl compounds are formed as by-products. Key words: polar trifluoromethylations, trifluoromethyl iodine(III) compounds, difluoromethyl group formation.

Réactions dans le sulfolane. VI. Etude de solutions des acides perchlonque, fluorosulfurique, pyrosulfurique et hexachloroantimonique

1970 ◽  
Vol 48 (15) ◽  
pp. 2353-2359 ◽  
Author(s):  
R. L. Benoit ◽  
C. Buisson ◽  
G. Choux
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Aprotic Solvent ◽  
Strong Acid ◽  
Acid Strength ◽  
Protic Solvent ◽  
Dilute Solution ◽  
Conductivity Data ◽  
Dipolar Aprotic Solvent ◽  
Nuclear Magnetic

Nuclear magnetic resonance and certain conductivity data are reported for solutions of perchloric and fluorosulfuric acids in sulfolane. Additional measurements were made on solutions of disulfuric and hexachloroantimony (V) acids. HSbCl6 is a strong acid in this weakly basic dipolar aprotic solvent. HClO4, HSO3F, and H2S2O7 are incompletely dissociated with K = 10−2.7, 10−3.3, and ~ 10−5, respectively. The acid strength in dilute solution in sulfolane follows the order HClO4 > HSO3F > H2S2O7, which differs from that known in H2SO4 which is a strongly associated polar protic solvent.

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