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IUPAC name 1,3-Propanedithiol
Other names 1,3-dimercaptopropane
CAS number 109-80-8
RTECS number TZ2585500
Molecular formula C3H8S
Molar mass 108.23 g/mol
Appearance colourless liquid, stench
Density 1.078 g/cm³
Melting point

-79 °C

Boiling point

169 °C

Solubility in water slight
Solubility in solvents all organic solvents
Refractive index (nD) 1.539
Dipole moment 0 D
Main hazards stench
R-phrases 36/37/38
S-phrases 26
Flash point 138 °F
Related Compounds
Related compounds 1,2-ethanedithiol
lipoic acid
Except where noted otherwise, data are given for
materials in their standard state
(at 25 °C, 100 kPa)

Infobox disclaimer and references

1,3-Propanedithiol is the chemical compound with the formula HSCH2CH2CH2SH. This dithiol is a useful reagent in organic synthesis. This liquid, which is readily available commercially, has an intense stench.


Use in organic synthesis

1,3-Propanedithiol is mainly used for the protection of aldehydes and ketones via their reversible formation of dithianes.[1] A prototypical reaction is its formation of 1,3-dithiane from from formaldehyde.[2] The reactivity of this dithiane illustrates the concept of umpolung.

The unpleasant odour of 1,3-propanedithiol has encouraged the development of alternative reagents that generate similar derivatives.[3]

Use in inorganic synthesis

1,3-Propanedithiol reacts with metal ions to form chelate rings. Illustrative is the synthesis of the diiron derivative:[4]

Fe3(CO)12 + C3H6(SH)2 → Fe2(S2C3H6)(CO)6 + H2 + Fe(CO)5 + CO


The stench of 1,3-propanedithiol can be neutralized with bleach.

See also

  • 1,2-Propanedithiol


  1. ^ Conrow, R. E.; Le Huérou, Y. (2004). "1,3-Propanedithiol".. J. Wiley & Sons, New York. DOI:10.1002/047084289. 
  2. ^ Corey, E. J.; Seebach, D. (1988). "1,3-Dithiane". Org. Synth.; Coll. Vol. 6: 556. 
  3. ^ Liu, Q.; Che, G. Yu, H.; Liu, Y.; Zhang, J. Zhang, Q.; Dong, D. (2003). "The First Nonthiolic, Odorless 1,3-Propanedithiol Equivalent and Its Application in Thioacetalization". Journal of Organic Chemistry 68: 9148 - 9150. doi:10.1021/jo034702t.
  4. ^ Winter, A.; Zsolnai, L. and Huttner, G. (1982). "Zweikernige und dreikernige Carbonyleisenkomplexe mit 1,2- und 1,3-Dithiolatobrückenliganden". Zeitschrift für Naturforschung 37b: 1430-1436.
This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "1,3-Propanedithiol". A list of authors is available in Wikipedia.
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