Sulfur trioxide pyridine complex

Identifiers

CAS Number

26412-87-3^Y

3D model (Jmol)

Interactive image

ChemSpider

147422^Y

ECHA InfoCard

InChI=1S/C5H5N.O3S/c1-2-4-6-5-3-1;1-4(2)3/h1-5H;^Y
Key: UDYFLDICVHJSOY-UHFFFAOYSA-N^Y
InChI=1/C5H5N.O3S/c1-2-4-6-5-3-1;1-4(2)3/h1-5H;
Key: UDYFLDICVHJSOY-UHFFFAOYAG

SMILES

O=S(=O)=O.n1ccccc1

Properties

Chemical formula

C₅H₅NSO₃

Molar mass

159.16 g/mol

Appearance

white solid

Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).

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Infobox references

Sulfur trioxide pyridine complex is the compound with the formula C₅H₅NSO₃. It is a colourless solid that dissolves in polar organic solvents. It is the adduct formed from the Lewis base pyridine and the Lewis acid sulfur trioxide. The compound is mainly used as a source of sulfur trioxide, for example in the synthesis of sulfate esters from alcohols:^[1]

ROH + C₅H₅NSO₃ → [C₅H₅NH]⁺[ROSO₃]⁻

It is also an activating electrophile in a Parikh-Doering oxidation.^[2]

References

↑ Thomas T. Tidwell "Sulfur Trioxide–Pyridine" Encyclopedia of Reagents for Organic Synthesis 2001, John Wiley & Sons. doi:10.1002/047084289X.rs139m. Article Online Posting Date: April 15, 2001
↑ Jekishan R. Parikh, William v. E. Doering (1967). "Sulfur trioxide in the oxidation of alcohols by dimethyl sulfoxide". J. Am. Chem. Soc. 89 (21): 5505–5507. doi:10.1021/ja00997a067.

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