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Methanesulfonic acid


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Name Methanesulfonic acid EINECS 200-898-6
CAS No. 75-75-2 Density 1.511 g/cm3
Solubility Melting Point 19 °C
Formula CH4O3S Boiling Point 167 °C (10 torr)
Molecular Weight 96.10 Flash Point >230 °F
Transport Information UN 3265 8/PG 2 Appearance colourless or light yellow liquid
Safety 26-36-45-1/2-36/37/39 Risk Codes 34-22
Molecular Structure Molecular Structure of 75-75-2 (Methanesulfonic acid) Hazard Symbols CorrosiveC



Methanesulfonic acid is a colorless liquid with the chemical formula CH3SO3H. It is the simplest of the alkylsulfonic acids. Salts and esters of methanesulfonic acid are known as mesylates. It is also called  Methanesulphonic acid, methanesulphonic-acid-, Sulfomethane, CCRIS 2783, HSDB 5004.  Methanesulfonic acid is used as an acid catalyst in organic reactions because it is non-volatile, strong acid that is soluble in organic solvents.Methanesulfonic acid toxic is people .It shoule be Keeped  locked up and out of the reach of children.when you use it, you should  wear suitable protective clothing. In case of contact with eyes, rinse immediately with plenty of water and seek medical advice. In case of accident or if you feel unwell, seek medical advice immediately (show label where possible).

Physical properties about Methanesulfonic acid are:
(1)ACD/LogP: -2.087; (2)ACD/LogD (pH 5.5): -5.39; (3)ACD/LogD (pH 7.4): -5.58; (4)ACD/BCF (pH 5.5): 1.00; (5)ACD/BCF (pH 7.4): 1.00; (6)ACD/KOC (pH 5.5): 1.00 ; (7)ACD/KOC (pH 7.4): 1.00; (8)#H bond acceptors: 3 ; (9)#H bond donors: 1; (10)Index of Refraction: 1.448; (11)Molar Refractivity: 17.019 cm3; (12)Molar Volume: 63.581 cm3; (13)Polarizability: 6.747 10-24cm3; (14)Surface Tension: 53.3790016174316 dyne/cm; (15)Density: 1.512 g/cm3

Preparation of Methanesulfonic acid:
A process for the preparation of methanesulfonic acid comprising reacting sulfite ions within an aqueous system with dimethyl sulfate at an elevated temperature and, subsequently, adding a strong acid, wherein the molar ratio of sulfite ions to dimethyl sulfate is 1.5 to 2.5:1, and the reaction is maintained at said elevated temperature for at least 2 h.

Uses of Methanesulfonic acid:
Methanesulfonic acid may be considered an intermediate compound between sulfuric acid (H2SO4), and methylsulfonylmethane ((CH3)2SO2), effectively replacing an -OH group with a -CH3 group at each step. This pattern can extend no further in either direction without breaking down the -SO2 group. Methanesulfonic acid can be used in the generation of BH3. By reacting methanesulfonic acid with NaBH4 in an aprotic solvent such as THF or DMS, the complex of BH3 and the solvent is formed.

You can still convert the following datas into molecular structure:

The toxicity data of Methanesulfonic acid is as follows:

Organism Test Type Route Reported Dose (Normalized Dose) Effect Source
guinea pig LD50 skin > 2gm/kg (2000mg/kg)   Kodak Company Reports. Vol. 21MAY1971,
quail LD50 oral 1gm/kg (1000mg/kg)   Journal of Reproduction and Fertility. Vol. 48, Pg. 371, 1976.
rat LC inhalation > 330ppm/6H (330ppm)   Kodak Company Reports. Vol. 21MAY1971,
rat LD50 oral 200mg/kg (200mg/kg)   Kodak Company Reports. Vol. 21MAY1971,

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