1,2-Benzenedithiol | |
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Benzene-1,2-dithiol |
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Other names
1,2-Dimercaptobenzene |
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Identifiers | |
CAS number | 17534-15-5 |
PubChem | 69370 |
ChemSpider | 13840080 |
Jmol-3D images | Image 1 Image 2 |
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Properties | |
Molecular formula | C6H6S2 |
Molar mass | 142.24 g/mol |
Appearance | colourless liquid |
Density | 1.236 g/mL |
Melting point |
22-24 °C |
Boiling point |
119-120 °C/17 mmHg |
Solubility in water | Soluble in basic water |
Hazards | |
Main hazards | stench |
Flash point | 219.2 °F (104 °C) |
(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 |
1,2-Benzenedithiol is the organosulfur compound with the formula C6H4(SH)2. This colourless viscous liquid consists of a benzene ring with a pair of adjacent thiol groups. The conjugate base of this diprotic compound serves as chelating agent in coordination chemistry and a building block for the synthesis of other organosulfur compounds.[1]
Contents |
The compound is prepared by ortho-lithiation of benzenethiol using butyl lithium (BuLi) followed by sulfidation:[2]
The compound was first prepared from 2-aminobenzenethiol via diazotization.[3] Alternatively, it forms from 1,2-dibromobenzene.[4]
Oxidation mainly affords the polymeric disulfide. Reaction with metal dihalides and metal oxides gives the dithiolate complexes of the formula LnM(S2C6H4) where LnM represents a variety of metal centers, e.g. (C5H5)2Ti. Ketones and aldehydes condense to give the heterocycles called dithianes:
3,4-Toluenedithiol, also called dimercaptotoluene (CAS#496-74-2), behaves similarly to 1,2-benzenedithiol but is a solid at ambient temperatures (m.p. 135-137 °C).
Alkene-1,2-dithiols are unstable, although metal complexes of alkene-1,2-dithiolates, called dithiolene complexes, are well known.[1]