Chlorosulphuric acid

The Wallach rearrangement has been reported for perfluoro derivatives36. Reactions are much slower, as expected, and in sulphuric acid the octafluoro compound 35 gave no rearrangement product, but in chlorosulphuric acid rearrangement did occur to give the 4-chlorosulphonate ester. 

Diphenylselenophene tetrasulphonic acid, C16H12012S4Se occurs when the selenophene is suspended in petroleum ether an< sulphonated at 0° C. by the addition of chlorosulphuric acid. It i isolated as the barium salt, and the free acid liberated by the aid o sulphuric acid. The acid crystallises from alcohol as colourless, long glassy prisms, freely soluble in water and melting above 300° C. Th yield is very poor. 

The formation of sulphuric and chlorosulphuric acids by the union of sulphur trioxide with water and hydrogen chloride respectively is brought about by the secondary valencies as indicated in the schemes 03S+0H2=03S. . . OH2 and 03S+C1H=03S. . . C1H. When one of the reacting molecules contains douhle-linked atoms, the auxiliary valencies may not he sufficiently strong to preserve the integrity of the new mol., and, the atoms of the addition product may be rearranged. For example, this is the case with sulphur trioxide. Thus ... 

When dry HCl is passed into fuming HgSO, which contains SO3, the compound HOSO2CI, chlorosulphuric acid, is formed. Its relation to H2SO4 and SOgClg is shown diagrammatically ... 

Acid of Fordos and Gelis H Chlorosulphuric Acid. H Nitrosulphuric Acid. . II... 

Some thermodynamic functions at saturation of several metal sulphates in H2SO4 and D28O4 have been calculated from solubility data. The kinetics of dissolutionof iron(ii) sulphide in aqueous sulphuric acid have been measured/ The behaviour of various solutes in chlorosulphuric acid has been investigated conductometrically. A potentiometric study of the system (32) in sulfolane has enabled the dissociation constant of the reaction (33) to be determined. The rate of decomposition of trifluoromethanesulphonic acid in water and its reactivity towards various metals have been investigated. ... 

The S-PEEK polymers can be synthesized by means of a direct electrophilic sulfonation via concentrated sulphuric acid or via chlorosulphuric acid. 

Fluorosulphuric Acid, Chlorosulphuric Acid, Difluprophosphoric Acid... 

Table 341 Physical Properties of Fluorosulphuric Acid Chlorosulphuric Acid, Difluxyrophosphoric...

In general chlorosulphuric acid is a good solvent for chlorides. Boron(III) chloride as well as antimony(V) chloride show acidic properties according to the reaction... 

The molecular models and Newman projections of two conformers of fluorosulphuric acid methyl ester and chlorosulphuric acid methyl ester... 

Radial distributions of chlorosulphuric acid methyl ester. The positions of the most important rotation-dependent distances are shown... 

This phenomenon has, in fact, been utilized in several structure analyses, e.g. those on chlorosulphuric acid methyl ester (Hargittai, Schultz and Kolonits, 1977) divinyl sulphone (Hargittai, Rozsondai, Nagel, Bulcke, Robinet and Labarre, 1977)> sulphonyl chloride isocyanate (Brunvoll, Hargittai and Seip,... 

Fluorosulphuric acid and chlorosulphuric acid are weaker than H2S2O7 and consequently cause a slower increase in the acidity than is caused by H2S2O7 (Figure 4). However, as the composition HSO3F is approached the value of Hq rises rapidly, and the acidity of 100 per cent HSO3F exceeds that of H2S2O7. This is to be attributed to the fact that the autoprotolysis constant of HSO3F is considerably smaller... 

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