Sodium methylsulfinylmethylide
| Sodium methylsulfinylmethylide | |
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Sodium methylsulfinylmethylide |
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Other names
sodium dimsylate, dimsylsodium, NaDMSYL |
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| Identifiers | |
| Abbreviations | NaDMSO |
| CAS number | 15590-23-5  |
| ChemSpider | 8329518  |
| Jmol-3D images | Image 1 |
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| Properties | |
| Molecular formula | C2H5NaOS |
| Molar mass | 100.13 |
| Appearance | Colorless solid, may be apple-green or purple in solution [1] |
| Solubility in water | Reacts forming DMSO |
| Solubility | Very soluble in DMSO and many polar organic solvents |
| Hazards | |
| Main hazards | decomposes to corrosive NaOH |
| Related compounds | |
| Related compounds | Dimethyloxosulfonium methylide, dimethyl sulfoxide |
 (verify) (what is:  / ?)Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 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 several uses in organic chemistry as a base and nucleophile.
Since the first publication in 1965 by Corey et al.,[2] a large number of publications have described additional uses for this reagent.[3]
Contents |
[edit] Preparation
Sodium methylsulfinylmethylide is prepared by heating sodium hydride[4] or sodium amide[5] in DMSO.
- CH3SOCH3 + NaH → CH3SOCH2−Na+ + H2
- CH3SOCH3 + NaNH2 → CH3SOCH2−Na+ + NH3
[edit] Reactions
[edit] As a Base
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]
[edit] Reaction with esters
NaDMSO will condense with esters (1) to form β-ketosulfoxides (2), which have been shown to be very useful synthetic 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]
[edit] References
- ^ http://www.21chemnet.com/cas/15590-23-5.html
- ^ 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. doi:10.1021/ja01084a033.
- ^ Durst, T. (1969). Adv. Org. Chem. (review) 6: 285.
- ^ Iwai, I.; Ide, J. (1988), "2,3-Diphenyl-1,3-Butadiene", Org. Synth.; Coll. Vol. 6: 531
- ^ 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. doi:10.1016/S0022-328X(00)95020-4.
- ^ Romo, D.; Myers, A. I. (1992). "An asymmetric route to enantiomerically pure 1,2,3-trisubstituted cyclopropanes". J. Org. Chem. 57 (23): 6265. doi:10.1021/jo00049a038.
- ^ Trost, B. M.; Melvin, L. S., Jr. (1975). Sulfur Ylides: Emerging Synthetic Intermediates. New York: Academic Press. ISBN 0-12-701060-2.
- ^ 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. doi:10.1021/jo00284a043.
- ^ 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. doi:10.1021/jo00337a002.
- ^ Isibashi, H.; Okada, M.; Komatsu, H.; Ikeda, M. S. (1985). Synthesis: 643.
[edit] External links
- "The Dimethyl Sulfoxide (DMSO) Anion — Dimsyl Ion". Gaylord Chemical Corporation. October 2007.
- "Preparation of dimsyl sodium". June 2009.
