THE REACTION OF METHANESULFONIC ACID WITH SULFUR TRIOXIDE

1966 ◽  
Vol 44 (12) ◽  
pp. 1437-1444 ◽  
Author(s):  
E. A. Robinson ◽  
V. Silberberg
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Raman Spectra ◽  
Sulfonic Acid ◽  
Sulfur Trioxide ◽  
Methanesulfonic Acid ◽  
Resonance Peak ◽  
Methane Sulfonic Acid ◽  
Low Concentrations ◽  
Rapid Equilibrium

The reaction of sulfur trioxide with methanesulfonic acid has been studied by examination of the nuclear magnetic resonance (n.m.r.) and Raman spectra of solutions containing up to 0.8 stoichiometric mole fraction of SO3.At relatively low SO3 concentrations the polysulfonic acid CH3S2O6H is formed initially and reacts with excess methane sulfonic acid to give methanesulfonic anhydride.[Formula: see text]CH3S2O6H and CH3SO3H exchange protons and SO3 rapidly and a single methyl resonance peak only is observed for these species in the n.m.r. spectrum. A separate methyl resonance is observed for (CH3)2S2O5 at relatively low concentrations of SO3, but at higher concentrations the peak merges with that due to CH3SO3H and CH3S2O6H because of the rapid equilibration of (CH3)2S2O5 with H2S2O7.[Formula: see text]At higher concentrations of SO3 it is likely that the system contains polymers of the three series CH3Sn+1O3n+3H, (CH3)2Sn+2O3n+5, and H2Sn+1O3n+4 in rapid equilibrium. Free SO3 is not found in the system at concentrations less than 60 mole %.

Hydration of Some Acids in Sulfolane

1975 ◽  
Vol 53 (18) ◽  
pp. 2683-2688 ◽  
Author(s):  
R. L. Benoit ◽  
S. Y. Lam
Keyword(s):  
Acetic Acid ◽  
Sulfonic Acid ◽  
Picric Acid ◽  
Methanesulfonic Acid ◽  
Pressure Measurements ◽  
Methane Sulfonic Acid ◽  
Enthalpy Changes ◽  
Low Concentrations ◽  
Vapor Pressure Measurements ◽  
And Calorimetry

Interaction between water at low concentrations and some carboxylic acids, methane-sulfonic acid and picric acid, HA, have been studied in Sulfolane at 30 °C. Vapor pressure measurements and calorimetry were used. Results are interpreted in terms of hydration constants K1 and enthalpy changes ΔH1, for the 1:1 complexes [Formula: see text] The values of K1 are low and generally increase slightly with the strength of the acid HA from ∼0.4 for acetic acid to 5.7 for methanesulfonic acid.

scholarly journals Einfache Darstellungsmethode des Zwischenprodukts 2.3-Dihydroxy-6.7-dimethylnaphtalin / Synthesis of 6′,7′-Dimethyl-naphto- (2′,3′) -imidazole-4,5. A Convenient Method for the Preparation of the Intermediate 2,3-Dihydroxy-6,7-dimethyl-naphtalene

1971 ◽  
Vol 26 (7) ◽  
pp. 701-703 ◽  
Author(s):  
Paul Renz
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Magnetic Resonance Spectroscopy ◽  
Nuclear Magnetic Resonance Spectroscopy ◽  
Convenient Method ◽  
Sulfonic Acid ◽  
Potassium Hydroxide ◽  
Starting Material ◽  
Resonance Spectroscopy ◽  
Vitamin B

2-Hydroxy-6,7-dimethyl-naphtalene is sulfonated to 2-Hydroxy-6,7-dimethyl-naphtalene 3-sulfonic acid at 100°. On fusion of this sulfonic acid with potassium hydroxide 2,3-Dihydroxy-6,7-dimethylnaphtalene is obtained. The structure of this compound was proved by nuclear magnetic resonance spectroscopy. The latter compound is a good starting material for the synthesis of 6′,7′-Dimethylnaphto- (2′,3′) -imidazole-4,5 the base of a new vitamin B12-analogue, which was biosynthetically prepared recently.

Nuclear Magnetic Resonance Studies of 43Ca

1973 ◽  
Vol 28 (9) ◽  
pp. 1534-1536 ◽  
Author(s):  
O. Lutz ◽  
A. Schwenk ◽  
A. Uhl
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Magnetic Moment ◽  
Calcium Salt ◽  
Chemical Shifts ◽  
Biological Systems ◽  
Natural Abundance ◽  
Salt Solutions ◽  
Magnetic Resonance Studies ◽  
Low Concentrations

The ratio of the Larmor frequencies of 43Ca and 37Cl has been measured and a magnetic moment for 43Ca of μ(43Ca2+ in D2O) = -1.315645 (7) μN; has been calculated. 43Ca chemical shifts have been determined in aqueous calcium salt solutions with 43Ca in natural abundance, also at low concentrations. The latter result is interesting for 43Ca studies in biological systems.

Amination of tetrazoles with hydroxylamine-O-sulfonic acid: 1- and 2-aminotetrazoles

1969 ◽  
Vol 47 (19) ◽  
pp. 3677-3681 ◽  
Author(s):  
R. Raap
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Aqueous Solutions ◽  
Sulfonic Acid ◽  
Weakly Alkaline ◽  
Nuclear Magnetic Resonance Spectra ◽  
Magnetic Resonance Spectra ◽  
Nuclear Magnetic

1-Aminotetrazoles and 2-aminotetrazoles can be prepared by reacting tetrazoles with hydroxylamine-O-sulfonic acid in weakly alkaline aqueous solutions. The nuclear magnetic resonance spectra and some of the properties of these aminotetrazoles are described.

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