Dimethyl sulfite

Structural formula
General
Surname	Dimethyl sulfite
other names	Methyl sulfite Dimethoxy sulfoxide Sulfurous acid dimethyl ester
Molecular formula	C 2 H 6 O 3 S
Brief description	colorless liquid
External identifiers / databases
CAS number 616-42-2 EC number 210-481-0 ECHA InfoCard 100.009.529 PubChem 69223 ChemSpider 62436 Wikidata Q418463
properties
Molar mass	110.13 g · mol -1
Physical state	liquid
density	1.21 g cm −3 (20 ° C)
boiling point	126-127 ° C
solubility	Decomposes in water
Refractive index	1.4083 (20 ° C, 589 nm)
safety instructions
GHS labeling of hazardous substances Caution H and P phrases H: 226-315-319-335 P: 210-302 + 352-304 + 340-305 + 351 + 338
Thermodynamic properties
ΔH f 0	−523.6 kJ / mol
As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions . Refractive index: Na-D line , 20 ° C

Dimethyl sulfite is the Di -methyl ester of the sulfur dioxide . Dimethyl sulfite is the simplest organic sulfite and is used as an antioxidant in polymers.

Extraction and presentation

Although dimethyl sulfite is formally derived from sulfurous acid, it is produced by the reaction of thionyl chloride and methanol .

${\displaystyle \mathrm {OSCl_{2}+2\;CH_{3}OH\rightarrow OS(OCH_{3})_{2}+2\;HCl} }$

Individual evidence

1. ↑ ^{a b c d e f g} Data sheet dimethyl sulfite (PDF) from Merck , accessed on March 25, 2011.
2. ↑ David R. Lide (Ed.): CRC Handbook of Chemistry and Physics . 90th edition. (Internet version: 2010), CRC Press / Taylor and Francis, Boca Raton, FL, Standard Thermodynamic Properties of Chemical Substances, pp. 5-23.