Sodium methylsulfinylmethylide

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Sodium methylsulfinylmethylide
NaDMSO Structure.png
IUPAC name
Sodium methylsulfinylmethylide
Other names
sodium dimsylate, dimsylsodium, NaDMSYL
3D model (JSmol)
Abbreviations NaDMSO
Molar mass 100.13
Appearance White solid, may be apple-green or purple in solution [1]
Reacts forming DMSO
Solubility Very soluble in DMSO and many polar organic solvents
Main hazards decomposes to corrosive NaOH
Related compounds
Related compounds
Dimethyloxosulfonium methylide, dimethyl sulfoxide
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

Sodium methylsulfinylmethylide (also called NaDMSO or dimsyl sodium) is the sodium salt of the conjugate base of dimethyl sulfoxide. This unusual salt has some uses in organic chemistry as a base and nucleophile.

Since the first publication in 1965 by Corey et al.,[2] a number of additional uses for this reagent have been identified.[3]


Sodium methylsulfinylmethylide is prepared by heating sodium hydride[4] or sodium amide[5] in DMSO.

CH3SOCH3 + NaH → CH3SOCH2Na+ + H2
CH3SOCH3 + NaNH2 → CH3SOCH2Na+ + NH3


As a Base[edit]

The pKa of DMSO is 35, which leads NaDMSO to be a powerful Brønsted base. NaDMSO is used in the generation of phosphorus and sulfur ylides.[6] NaDMSO in DMSO is especially convenient in the generation of dimethyloxosulfonium methylide and dimethylsulfonium methylide.[2][7]

Reaction with esters[edit]

NaDMSO condenses with esters (1) to form β-ketosulfoxides (2), which can be useful intermediates.[8] Reduction of β-ketosulfoxides with aluminium amalgam gives methyl ketones (3).[9] Reaction with alkyl halides followed by elimination gives α,β-unsaturated ketones (4). Interestingly, β-ketosulfoxides can also be used in the Pummerer rearrangement to introduce nucleophiles alpha to a carbonyl (5).[10]

Reactions of b-ketosulfoxides


  1. ^
  2. ^ a b Corey, E. J.; Chaykovsky, M. (1965). "Methylsulfinyl Carbanion (CH3-SO-CH2). Formation and Applications to Organic Synthesis". J. Am. Chem. Soc. 87 (6): 1345–1353. doi:10.1021/ja01084a033. 
  3. ^ , Mukulesh Mondal "Sodium methylsulfinylmethylide: A versatile reagent" Synlett 2005, vol. 17, 2697-2698. doi:10.1055/s-2005-917075
  4. ^ Iwai, I.; Ide, J. (1988). "2,3-Diphenyl-1,3-Butadiene". Org. Synth. ; Coll. Vol., 6, p. 531 
  5. ^ Kaiser, E. M.; Beard, R. D.; Hauser, C. R. (1973). "Preparation and reactions of the mono- and dialkali salts of dimethyl sulfone, dimethyl sulfoxide, and related compounds". J. Organomet. Chem. 59: 53–64. doi:10.1016/S0022-328X(00)95020-4. 
  6. ^ Romo, D.; Myers, A. I. (1992). "An asymmetric route to enantiomerically pure 1,2,3-trisubstituted cyclopropanes". J. Org. Chem. 57 (23): 6265–6270. doi:10.1021/jo00049a038. 
  7. ^ Trost, B. M.; Melvin, L. S., Jr. (1975). Sulfur Ylides: Emerging Synthetic Intermediates. New York: Academic Press. ISBN 0-12-701060-2. 
  8. ^ Ibarra, C. A; Rodgríguez, R. C; Monreal, M. C. F; Navarro, F. J. G.; Tesoreo, J. M. (1989). "One-pot synthesis of β-keto sulfones and β-keto sulfoxides from carboxylic acids". J. Org. Chem. 54 (23): 5620–5623. doi:10.1021/jo00284a043. 
  9. ^ Swenton, J. S.; Anderson, D. K.; Jackson, D. K.; Narasimhan, L. (1981). "1,4-Dipole-metalated quinone strategy to (±)-4-demethoxydaunomycinone and (±)-daunomycinone. Annelation of benzocyclobutenedione monoketals with lithioquinone bisketals". J. Org. Chem. 46 (24): 4825–4836. doi:10.1021/jo00337a002. 
  10. ^ Isibashi, H.; Okada, M.; Komatsu, H.; Ikeda, M. S. (1985). "A New Synthesis of Substituted Cyclopentenones by Olefin Cyclization Initiated by Pummerer Reaction Intermediates". Synthesis. 1985: 643–645. doi:10.1055/s-1985-31290. 

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