Sulfite ester

Short description: Class of chemical compounds

Dimethyl sulfite, the simplest sulfite ester

A sulfite ester (also known as an organosulfite) is a functional group with the structure (RO)(R'O)SO. They are in principle the esters of sulfurous acid, however as the acid cannot be produced they are in practice made via other routes.

They adopt a trigonal pyramidal molecular geometry due to the presence of lone pairs on the sulphur atom. When substituents R and R' differ, the compound is chiral owing to the stereogenic sulphur centre; when the R groups are the same the compound will have idealised Cs molecular symmetry.

They are commonly prepared by the reaction of thionyl chloride with alcohols.[1] The reaction is typically performed at room temperature to prevent the alcohol being converted into a chloroalkane. Bases such as pyridine can also be used to promote the reaction:

2 ROH + SOCl2 → (RO)2SO + 2 HCl

The pesticides endosulfan and propargite are sulfite esters. Other simple members include ethylene sulfite, dimethyl sulfite, and diphenylsulfite. Many examples have been prepared from diols, such as sugars. Sulfite esters can be powerful alkylation and hydroxyalkylation reagents.[2]

## Mono-esters

Mono-esters, with the general structure (RO)(HO)S=O are a rare subclass. Bufothionine is an example

## References

1. ↑ McCormack, W. B.; Lawes, B. C. "Sulfuric and sulfurous esters" Kirk-Othmer Encycl. Chem. Technol., 3rd Ed. (1983), 22, 233-54.doi:10.1002/0471238961.1921120613030315.a01
2. ↑ van Woerden, H. F. (1963). "Organic Sulfites.". Chemical Reviews 63 (6): 557–571. doi:10.1021/cr60226a001.

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Functional groups

| Only carbon,
hydrogen,
and oxygen|

| Hydrocarbons|

* Allene
* Alkene (Allyl group

|

Other|

* Acetoxy
* Acetyl
* Acryloyl
* Acyl
* Aldehyde
* Alkoxy (Methoxy)
* Benzoyl
* Carbonyl
* Carboxyl
* Carboxylic anhydride
* Dioxirane
* Epoxide
* Ester
* Ether
* Ethylenedioxy
* Hydroxy
* Ketone
* Methylenedioxy
* Peroxide (Organic)
* Ynone

Only one
element
apart from
C, H, O|

| Nitrogen|

* Amine
* Azo compound
* Cyanate
* Hydrazone
* Imide
* Imine
* Isocyanate
* Isonitrile
* Nitrene
* Nitrile
* Nitro compound
* Nitroso compound
* Organic amide
* Oxime

|

Phosphorus|

* Phosphonate
* Phosphonous

Sulfur|

* Disulfide
* Sulfone
* Sulfonic acid
* Sulfoxide
* Thial
* Thioester
* Thioether
* Thioketone
* Thiol

Selenium|

* Selenol
* Selenonic acid
* Seleninic acid
* Selenenic acid
* Selone

Tellurium|

* Tellurol
* Telluroketone

Other|

* Isothiocyanate
* Phosphoramide
* Sulfenyl chloride
* Sulfonamide
* Thiocyanate

See also chemical classification, chemical nomenclature ([[Chemistry:IUPAC nomenclature of inorganic, IUPAC nomenclature of organic chemistry|organic]])

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