Difference between revisions of "Trichloroacetic acid"
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Latest revision as of 09:59, 20 September 2010
| Trichloroacetic acid | |
|---|---|
| File:Trichloroacetic-acid-elpot.png | |
| Trichloroacetic acid | |
| style="background: #F8EABA; text-align: center;" colspan="2" | Identifiers | |
| CAS number | 76-03-9 
|
| RTECS number | AJ7875000 |
| SMILES | Script error: No such module "collapsible list". |
| style="background: #F8EABA; text-align: center;" colspan="2" | Properties | |
| Molecular formula | C2HCl3O2 |
| Molar mass | 163.4 g/mol |
| Appearance | white solid |
| Density | 1.63 g/cm³, solid |
| Melting point |
57 °C |
| Boiling point |
196 °C |
| Solubility in water | very good |
| Solubility in methanol | methanol 9.91 M [1] |
| Acidity (pKa) | 0.77[2] |
| style="background: #F8EABA; text-align: center;" colspan="2" | Structure | |
| Dipole moment | 3.23 D |
| style="background: #F8EABA; text-align: center;" colspan="2" | Hazards | |
| EU classification | Corrosive C) Dangerous for the environment (N) |
| R-phrases | R35, R50/53 |
| S-phrases | (S1/2), S26, S36/37/39, S45, S60, S61 |
| NFPA 704 | |
| style="background: #F8EABA; text-align: center;" colspan="2" | Related compounds | |
| Related chloroacetic acids | Chloroacetic acid Dichloroacetic acid |
| Related compounds | Acetic acid Trifluoroacetic acid Tribromoacetic acid |
 (what is this?) (verify)Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa) | |
| Infobox references | |
Trichloroacetic acid (also known as trichloroethanoic acid) is an analogue of acetic acid in which the three hydrogen atoms of the methyl group have all been replaced by chlorine atoms.
It is prepared by the reaction of chlorine with acetic acid in the presence of a suitable catalyst.
- CH3COOH + 3Cl2 → CCl3COOH + 3HCl
It is widely used in biochemistry for the precipitation of macromolecules such as proteins, DNA and RNA. Its sodium salt is used as a weedkiller. Solutions containing trichloroacetic acid as an ingredient are used for cosmetic treatments such as chemical peels and tattoo removal and the treatment of warts, including genital warts. It can kill normal cells as well. It is considered safe for use for this purpose during pregnancy[3].
Salts of trichloroacetic acid are called trichloroacetates. Reduction of trichloroacetic acid results in dichloroacetic acid, a pharmacologically active compound that shows promise for the treatment of cancer[4].
Contents
History
The discovery of trichloroacetic acid by Jean-Baptiste Dumas in 1840 delivered a striking example to the slowly evolving theory of organic radicals and valences.[5] The theory was contrary to the beliefs of Jöns Jakob Berzelius, starting a long dispute between Dumas and Berzelius.[6]
See also
References
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de:Trichloressigsäure es:Ácido tricloroacético fa:اسید تری کلرواستیک اسید fr:Acide trichloroacétique ko:트라이클로로아세트산 id:Asam trikloroasetat it:Acido tricloroacetico hu:Triklórecetsav nl:Trichloorazijnzuur ja:トリクロロ酢酸 pl:Kwas trichlorooctowy pt:Ácido tricloroacético ru:Трихлоруксусная кислота sv:Triklorättiksyra
zh:三氯乙酸- ↑ Solubility of trichloroacetic acid in methanol
- ↑ Ionization Constants of Heteroatom Organic Acids
- ↑ Wiley DJ, et al. (2002). External genital warts: Diagnosis, treatment, and prevention. Clinical Infectious Diseases, 35(Suppl 2): S210–S224
- ↑ The Carcinogenic Potency Database (CPDB)
- ↑ Dumas (1840). "Trichloroacetic acid". Annalen der Chemie. XXXII: 101.
- ↑ William Albert Noyes (1927). "Valence". Proceedings of the American Philosophical Society. 66: 287–308.
