Chemistry:Tetraethylammonium trichloride
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| Names | |
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| Other names
Mioskowski reagent
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| Identifiers | |
3D model (JSmol)
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PubChem CID
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| Properties | |
| C8H20Cl3N | |
| Molar mass | 236.61 g·mol−1 |
| Appearance | yellow solid |
| Solubility | Dichloromethane, ethanol, acetonitrile, pyridine[1] |
| log P | 3.95 |
| Related compounds | |
Related compounds
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Triethylmethylammonium trichloride |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). | |
| Infobox references | |
Tetraethylammonium trichloride (also known as Mioskowski reagent)[2] is a chemical compound with the formula [NEt4][Cl3] consisting of a tetraethylammonium cation and a trichloride as anion. The trichloride is also known as trichlorine monoanion representing one of the simplest polychlorine anions.[3] Tetraethylammonium trichloride is used as reagent for chlorinations and oxidation reactions.
Properties
At room temperature, tetraethylammonium trichloride is a yellow solid which is soluble in polar organic solvents (e.g., methylene chloride or acetonitrile). As it is a strong oxidant and chlorinating agent it is reacting with most organic solvents.[1] The trichloride can be considered as an symmetric anion as found in [NnPr4][Cl3], which is formed by a 3c-4e bond.[4]
Preparation
Commonly, tetraethylammonium trichloride is prepared by the reaction of tetraethylammonium chloride and elemental chlorine in methylene chloride at room temperature. After evaporation of the solvent, tetraethylammonium trichloride is obtained as a yellow solid.
[NEt4]Cl + Cl2 → [NEt4][Cl3]
Recently, an alternative preparation of tetraethylammonium trichloride has been described using tetraethylammonium chloride and potassium peroxymonosulfate as oxidant.[2]
Applications
In general, tetraethylammonium trichloride has a similar reactivity compared to elemental chlorine and other trichlorides, e.g., triethylmethylammonium trichloride. As tetraethylammonium trichloride is a solid and can be dissolved in methylene chloride or acetonitrile, it is used as an easier to handle alternative to elemental chlorine, in particular for the synthesis of intermediates in natural product synthesis.[5][6][7] Tetraethylammonium trichloride reacts with alkenes to the corresponding vicinal 1,2-dichlorinated alkanes and similarly with alkynes to the corresponding trans-dichlorinated alkenes. Electron rich arenes are chlorinated in para-position. While aldehydes are dichlorinated in alpha-position, ketones react to the monochlorinated alpha-chloroketones. In presence of 1,4-diazabicyclo[2.2.2]octane tetraethylammonium trichloride is a useful oxidant for the oxidation of primary alcohols to the corresponding aldehydes and of secondary alcohols to the corresponding ketones. For compounds bearing both a primary and a secondary alcohol, selective oxidation of the secondary alcohol is observed. Acetals undergo C-H chlorination of the tertiary C-H bond providing the corresponding chlorinated acetals.[1]
References
- ↑ 1.0 1.1 1.2 "Tetraethylammonium Trichloride: A Versatile Reagent for Chlorinations and Oxidations" (in German). Angewandte Chemie International Edition in English 36 (21): pp. 2342–2344. 1997-11-14. doi:10.1002/anie.199723421. ISSN 0570-0833.
- ↑ 2.0 2.1 "Convenient in situ generation of various dichlorinating agents from oxone and chloride: diastereoselective dichlorination of allylic and homoallylic alcohol derivatives". Organic & Biomolecular Chemistry 11 (26): 4312–5. July 2013. doi:10.1039/c3ob40670a. PMID 23715511.
- ↑ "Polyhalogen and Polyinterhalogen Anions from Fluorine to Iodine". Angewandte Chemie 59 (14): 5464–5493. March 2020. doi:10.1002/anie.201903197. PMID 31090163.
- ↑ "Insights into the Topology and the Formation of a Genuine ppσ Bond: Experimental and Computed Electron Densities in Monoanionic Trichlorine [Cl3 "]. Angewandte Chemie 60 (5): 2569–2573. February 2021. doi:10.1002/anie.202013727. PMID 33151006.
- ↑ "Synthesis of undecachlorosulfolipid A: re-evaluation of the nominal structure". Angewandte Chemie 50 (34): 7940–7943. August 2011. doi:10.1002/anie.201102521. PMID 21744447.
- ↑ "Total synthesis and stereochemical revision of the chlorinated sesquiterpene (±)-gomerone c". Angewandte Chemie International Edition in English 51 (52): 13066–9. December 2012. doi:10.1002/anie.201207203. PMID 23161813.
- ↑ "Asymmetric Total Synthesis of Clionastatins A and B". Journal of the American Chemical Society 143 (33): 13016–13021. August 2021. doi:10.1021/jacs.1c07511. PMID 34398601.
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