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1774-47-6 - Trimethylsulfoxonium iodide, 98+% - A14589 - Alfa Aesar

A14589 Trimethylsulfoxonium iodide, 98+%

CAS Number

Size Price ($) Quantity Availability
25g 15.84
100g 39.45
500g 133.90
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Trimethylsulfoxonium iodide, 98+%


Chemical Properties

Formula Weight
Melting point
ca 170° dec.
Light Sensitive
Soluble in water.


Trimethylsulfoxonium iodide reacts with sodium hydride to prepare dimethyloxosulfonium methylide, which is used as a methylene-transfer reagent in synthetic chemistry. It is used to prepare ylide, which reacts with carbonyl compounds to get epoxides. Further, it reacts with alfa,beta-unsaturated esters to get cyclopropyl esters.


Incompatible with strong oxidizing agents and strong bases. Light sensitive.

Literature References

The ylide, generated with strong base, is a methylene transfer reagent.

For an example (conversion of cyclohexanone to the epoxide), see: Org. Synth. Coll., 5, 755 (1973). In contrast to Trimethyl­sulfonium iodide, A12639, reaction with ɑß-unsaturated ketones occurs by 1,4-addition to give cyclopropanes: J. Am. Chem. Soc., 87, 1353 (1965):

Efficient addition to enones has been effected with a highly basic system consisting of KOH in DMSO with a phase-transfer catalyst: Synth. Commun., 26, 1785 (1996).

Reaction with epoxides gives oxetanes, unlike the sulfonium ylide which gives allylic alcohols: J. Org. Chem., 48, 5133 (1983); Synthesis, 1140 (1987); cf Tetrahedron Lett., 35, 5449 (1994):

Similarly, N-arenesulfonylaziridines undergo ring expansion to azetidines with inversion at one carbon. Thus, cis-substituted aziridines give trans-azetidines and vice versa: Tetrahedron, 45, 1851 (1989):

Review of the chemistry of sulfonium ylides: Russ. Chem. Rev., 50, 481 (1981). Extensive review of the synthetic applications of dimethylsulfoxonium methylide: Tetrahedron, 43, 2609 (1987).

Sathishkumar, S.; Mahasampathgowri, S.; Balasubramanian, K. K.; Saiganesh, R. A convenient synthesis of dialkyl 2-(2-haloethylidene)malonates, cyanoacetates and halocrotonates by one carbon extension. Tetrahedron Lett. 2015, 56 (26), 4031-4035.

Kagawa, N.; Suzuki, M.; Kogure, N.; Toume, K. Characterization of organic iodides with iodine-127 nuclear magnetic resonance spectroscopy. Tetrahedron Lett. 2015, 56 (42), 5795-5798.

GHS Hazard and Precautionary Statements

Hazard Statements: H315-H319-H335

Causes skin irritation. Causes serious eye irritation. May cause respiratory irritation.

Precautionary Statements: P261-P280-P305+P351+P338-P304+P340-P362-P312-P321-P405-P403+P233-P501a

Avoid breathing dust/fume/gas/mist/vapours/spray. Wear protective gloves/protective clothing/eye protection/face protection. IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing. IF INHALED: Remove to fresh air and keep at rest in a position comfortable for breathing. Take off contaminated clothing and wash before reuse. Call a POISON CENTER or doctor/physician if you feel unwell. Specific treatment (see label). Store locked up. Store in a well-ventilated place. Keep container tightly closed. Dispose of contents/container in accordance with local/regional/national/international regulations.

Other References

Harmonized Tariff Code


  • 43023

    Tetraethylammonium hydroxide, 35% w/w aq. soln., Reagent Grade
  • A11806

    Nitromethane, 98+%
  • A12646

    Triethylamine, 99%
  • 36292

    Acetic anhydride, ACS, 97+%
  • 36560

    Tetraethylammonium hydroxide, 35% w/w aq. soln.

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