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Methanesulfonic acid (MsOH, MSA) or methanesulphonic acid (in British English) is an organosulfuric, colorless liquid with the molecular formula CH 3 SO 3 H and structure H 3 C−S(=O) 2 −OH. It is the simplest of the alkylsulfonic acids ( R−S(=O) 2 −OH ).
Methanesulfonyl azide melts at 18 °C and decomposes from 120 °C. [1] Like many other azides, it is explosive. [3] At low temperature, methanesulfonyl azide crystallizes in the triclinic crystal system in the space group P1 with the lattice parameters a = 5.6240 Å; b = 5.9498 Å, c = 7.6329 Å, α = 72.216°, β = 70.897°, and γ = 88.601°, and two molecules per unit cell.
Sulfonic acids are strong acids. They are commonly cited as being around a million times stronger than the corresponding carboxylic acid. For example, p-Toluenesulfonic acid and methanesulfonic acid have pK a values of −2.8 and −1.9, respectively, while those of benzoic acid and acetic acid are 4.20 and 4.76, respectively
This definition was refined by Ronald Gillespie in 1971, as any acid with an H 0 value lower than that of 100% sulfuric acid (−11.93). [3] George A. Olah prepared the so-called " magic acid ", so named for its ability to attack hydrocarbons , by mixing antimony pentafluoride (SbF 5 ) and fluorosulfonic acid (FSO 3 H). [ 4 ]
Methanedisulfonic acid is the organosulfur compound with the formula CH 2 (SO 3 H) 2. It is the di sulfonic acid of methane . It is prepared by treatment of methanesulfonic acid with oleum .
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Ms 2 O may be prepared by the dehydration of methanesulfonic acid with phosphorus pentoxide. [2] P 2 O 5 + 6 CH 3 SO 3 H → 3 (CH 3 SO 2) 2 O + 2 H 3 PO 4. Ms 2 O can be purified by distillation under vacuum (distillation of a solid) or by recrystallization from Methyl tert-butyl ether/toluene.
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