Alkylsulphonic acids

R2 and R4 are the same or different and each is a substituent selected from H, Cl, Q 4-alkylsulphonic acid radical or the salts thereof, sulphonamide, or C -alkyl-substituted sulphonamide radical... 

Insertions of carbon dioxide, sulfur dioxide, and sulfur trioxide yield aluminum carboxylates, sulfinates, and sulfonates, respectively. Treatment of the resulting complexes with aqueous acid yields the corresponding alkylcarboxylic, alkylsulphinic, and alkylsulphonic acids. High pressure and temperatures of 220-240°C are required for multiple insertions of CO2 to yield more than one equivalent of carboxylic acid per aluminum. Excess aluminum trialkyl must be avoided or the initially formed carboxylate is completely alkylated to a trialkylcarbinol. Reaction of EtsAl with CO2, for example, gives a 90% yield of triethylcarbinol. 

Electrochemical fluorination of carboxylic acid fluoride and chloride or alkylsulphonic acid fluoride/ chloride is carried out in anhydrous hydrofluoric acid medium at t < 19 C (or t<35°C for n-C8Hi5S02F) at a voltage of 5-12 V and electric current density of 0.02 A/m ... 

Alkylsulphonic acids, extremely reactive acids with an alkyl group... 

Recently conjugated polyelectrolytes containing alkylsulphonic and alkyl-phosphonic groups have received considerable interest [176-180]. Sulfonate-substituted poly(p-phenylene) was prepared [ 176] using Suzuki co-polymerisation of 1,4-benzenediboronic acid with sulfonate monomer in three steps starting from 1,4-dimethoxybenzene ... 

---