{{Chembox new
|   Name = 乙二硫醇
|   ImageFile = Ethanedithiol.png
|   ImageSize = 150px
|   ImageName = 乙二硫醇
|   ImageFile1 = Ethane-1,2-dithiol-3D-balls.png
|   ImageSize1 = 150px
|   ImageName1 = 乙二硫醇的球棍模型
|   ImageFile2 = Ethane-1,2-dithiol-3D-vdW.png
|   ImageSize2 = 150px
|   ImageName2 = 乙二硫醇的空间填充模型
|   IUPACName = Ethane-1,2-dithiol
|   OtherNames = 1,2-乙二硫醇、二硫代乙二醇<br />1,2-二巯基乙烷
| Section1 = {{Chembox Identifiers
|   SMILES = SCCS
|   CASNo = 540-63-6
|   RTECS = KI3325000
  }}
| Section2 = {{Chembox Properties
|   Formula = C<sub>2</sub>H<sub>6</sub>S<sub>2</sub>
|   MolarMass = 94.20 
|   Appearance = 无色液体
|   Density = 1.123 g/cm³ (液)
|   Solubility = 微溶
|   Solvent = 其他溶剂
|   SolubleOther = 可溶于多数有机溶剂
|   MeltingPt = -41 °C<br />
|   BoilingPt = 146 °C<br />63 °C, 46 mmHg
|   pKa = ~11
|   pKb = 
|   Viscosity =  
|   RefractIndex = 1.5589 (D-line, 25 °C) 
  }}
| Section3 = {{Chembox Structure
|   Dipole =
  }}
| Section7 = {{Chembox Hazards
|   ExternalMSDS = 
|   EUClass = 有毒 ('''T''')
|   NFPA-H = 2 
|   NFPA-F = 2 
|   NFPA-R =
|   FlashPt = 50 °C
|   RPhrases = , 
|   SPhrases = 
  }}
| Section8 = {{Chembox Related
|   Function = 硫醇
|   OtherFunctn = 乙硫醇、苯硫酚<br />1,3-丙二硫醇、邻苯二硫醇
  }}
}}

'''乙二硫醇'''、'''1,2-乙二硫醇'''，分子式为C<sub>2</sub>H<sub>4</sub>(SH)<sub>2</sub>，室温下为无色有气味的液体。可用于有机合成试剂和螯合配体。

==有机合成应用==
乙二硫醇比酮。后者是有机合成中的重要中间体，也可用于保护。<ref>R. E. Conrow "Ethanedithiol" in Encyclopedia of Reagents for Organic Synthesis (Ed: L. Paquette) 2004, J. Wiley & Sons, New York. DOI: 10.1002/047084289.</ref>

::C<sub>2</sub>H<sub>4</sub>(SH)<sub>2</sub>  +   RR'CO  →  C<sub>2</sub>H<sub>4</sub>S<sub>2</sub>CRR'  +  H<sub>2</sub>O

:400px|用乙二硫醇将其转变为缩硫醛/酮，保护羰基

{{Chembox new
|   Name = 1,2-Ethanedithiol
|   ImageFile = Ethanedithiol.png
|   ImageSize = 150px
|   ImageName = 1,2-Ethanedithiol
|   ImageFile1 = Ethane-1,2-dithiol-3D-balls.png
|   ImageSize1 = 150px
|   ImageName1 = Ball-and-stick model of ethane-1,2-dithiol
|   ImageFile2 = Ethane-1,2-dithiol-3D-vdW.png
|   ImageSize2 = 150px
|   ImageName2 = Space-filling model of ethane-1,2-dithiol
|   IUPACName = Ethane-1,2-dithiol
|   OtherNames = Dimercaptoethane<br />1,2-Ethanedithiol
| Section1 = {{Chembox Identifiers
|   SMILES = SCCS
|   CASNo = 540-63-6
|   RTECS = KI3325000
  }}
| Section2 = {{Chembox Properties
|   Formula = C<sub>2</sub>H<sub>6</sub>S<sub>2</sub>
|   MolarMass = 94.20 g/mol
|   Appearance = Colorless liquid
|   Density = 1.123 g/cm³, liquid
|   Solubility = Slightly sol 
|   Solvent = other solvents
|   SolubleOther = Good solubility in<br />most organic solvents
|   MeltingPt = -41 °C<br />
|   BoilingPt = 146 °C<br />63 °C @46 mmHg
|   pKa = ~11
|   pKb = 
|   Viscosity =  
|   RefractIndex = 1.5589 (D-line, 25 °C) 
  }}
| Section3 = {{Chembox Structure
|   Dipole =
  }}
| Section7 = {{Chembox Hazards
|   ExternalMSDS = 
|   EUClass = Toxic ('''T''')
|   NFPA-H = 2 
|   NFPA-F = 2 
|   NFPA-R =
|   FlashPt = 50 °C
|   RPhrases =  
|   SPhrases = 
  }}
| Section8 = {{Chembox Related
|   Function = thiols
|   OtherFunctn = Ethanethiol; 1,3-Propanedithiol; 1,2-Benzenedithiol; Thiophenol
  }}
}}

'''1,2-Ethanedithiol''' is an odorous, colorless liquid with the formula C<sub>2</sub>H<sub>4</sub>(SH)<sub>2</sub>.  It is a common building block in organic synthesis and an excellent ligand for metal ions.

==Preparation==
1,2-Ethanedithiol is commercially available. It can be prepared by the action of 1,2-dibromoethane on thiourea followed by hydrolysis.<ref></ref>

==Applications==
This compound is widely used in organic chemistry because it reacts with aldehydes and ketones to give 1,3-dithiolanes, which are useful intermediates.
<ref>R. E. Conrow "Ethanedithiol" in Encyclopedia of Reagents for Organic Synthesis (Ed: L. Paquette) 2004, J. Wiley & Sons, New York. DOI: 10.1002/047084289.</ref>

::C<sub>2</sub>H<sub>4</sub>(SH)<sub>2</sub>  +   RR'CO  →  C<sub>2</sub>H<sub>4</sub>S<sub>2</sub>CRR'  +  H<sub>2</sub>O