p-Toluenesulfonic acid
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| p-Toluenesulfonic acid | |
|---|---|
| Image:Tosic acid.png Image:Tosic-acid-3D-balls.png | |
| Chemical name | 4-methylbenzenesulfonic acid |
| Other names | p-toluenesulfonic acid tosic acid |
| Chemical formula | C7H8O3S |
| Molecular mass | 172.20 g/mol |
| CAS number | [104-15-4] [6192-52-5] (monohydrate) |
| Melting point | 106-107 °C 103-106 °C (monohydrate) |
| Boiling point | 140 °C at 20 mmHg |
| SMILES | Cc1ccc(S(=O)(O)=O)cc1 |
| Appearance | colorless (white) solid |
| Properties | |
| Density and phase | ? g/cm³, ? |
| Solubility in water | 67g/100 ml |
| Acidity (pKa) | -2.8 |
| Structure | |
| Molecular shape | tetrahedral at S |
| Dipole moment | ? D |
| Hazards | |
| MSDS | External MSDS |
| Main hazards | skin irritant |
| NFPA 704 | |
| R/S statement | R: 36/37/38 S: 26 |
| RTECS number | ? |
| Supplementary data page | |
| Structure and properties | n, εr, etc. |
| Thermodynamic data | Phase behaviour Solid, liquid, gas |
| Spectral data | UV, IR, NMR, MS |
| Related compounds | |
| Other anions | ? |
| Other cations | ? |
| Related ? | ? |
| Related compounds | ? |
| Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa) Infobox disclaimer and references | |
p-Toluenesulfonic acid is an organic compound with the formula CH3C6H4SO3H. TsOH, as it is abbreviated, is a white solid that is soluble in water, alcohols, and other polar organic solvents. Most often, TsOH refers to the monohydrate, TsOH.H2O.
TsOH is a strong organic acid, about a million times stronger than benzoic acid. It is one of the few strong acids that is solid and, hence, conveniently weighed. Also, unlike some of the strong mineral acids (especially nitric acid, sulfuric acid, and perchloric acid), TsOH is non-oxidizing.
Preparation and handling
pTsOH is prepared on an industrial scale by the sulfonation of toluene. It hydrates readily. Common impurities include benzenesulfonic acid and sulfuric acid. Impurities can be removed by recrystallization from concentrated hydrochloric acid followed by azeotropic drying.[1]
Toluenesulfonic acid finds use in organic synthesis as an "organic-soluble" acid catalyst. Examples of uses:
- acetalization of an aldehyde.[1]
- Esterification of carboxylic acids.[1]
- Transesterification of an ester.[1]
See also
It is also used as a catalyst with 3,4 dihydro-2H pyran in alcohol protection.
Reference
- Merck Index, 11th Edition, 9459.
External links
fr:acide paratoluènesulfonique ja:パラトルエンスルホン酸
Acknowledgement and Attribution Regarding Sources of Content
Some of the initial content on this page may be incorporated in part from copyleft sources in the public domain including wikis such as Wikipedia and AskDrWiki. Drug information for patients came from the The National Library of Medicine. Infectious disease information may have come from the Centers for Disease Control (CDC). Differential Diagnoses are drawn from clinicians as well as an amalgamation of 3 sources: 1.The Disease Database; 2. Kahan, Scott, Smith, Ellen G. In A Page: Signs and Symptoms. Malden, Massachusetts: Blackwell Publishing, 2004:3; 3. Sailer, Christian, Wasner, Susanne. Differential Diagnosis Pocket. Hermosa Beach, CA: Borm Bruckmeir Publishing LLC, 2002:7 .
