Product Description
1,3-Dimercaptopropane (CAS 109-80-8, HSCH₂CH₂CH₂SH), also called 1,3-propanedithiol, is a colorless to pale yellow liquid with a strong, unpleasant mercaptan odor. It is a bifunctional thiol used as a building block, chelating agent and protective group reagent in organic synthesis, electronics and specialty chemicals.
Key features:
Two terminal thiol groups, highly reactive toward alkyl halides, epoxides and aldehydes/ketones.
Forms 1,3-dithiane rings with carbonyl compounds — a classic carbonyl protective group.
Good chelating ability toward soft metals (Au, Ag, Hg, Pb).
Soluble in most organic solvents, slightly soluble in water.
High-purity grades available for electronic and pharmaceutical use.
Useful as chain transfer agent, crosslinker and sulfur source.
Product Parameters
| Item | Specification |
|---|---|
| Product Name | 1,3-Dimercaptopropane (1,3-Propanedithiol) |
| CAS No. | 109-80-8 |
| EINECS No. | 203-706-9 |
| Molecular Formula | C₃H₈S₂ (HSCH₂CH₂CH₂SH) |
| Molecular Weight | 108.23 |
| Appearance | Colorless to pale yellow liquid |
| Purity | ≥ 98.0% |
| Density (20 °C) | 1.070 – 1.078 g/cm³ |
| Boiling Point | 168 – 170 °C |
| Refractive Index (n20/D) | 1.530 – 1.535 |
| Solubility | Slightly soluble in water; miscible with organic solvents |
| Storage | Cool, dry, sealed; malodor, keep away from oxidizers |
| Packaging | 25 kg / 200 kg PE-lined drum |
Product Application
1,3-Dimercaptopropane is a specialty dithiol mainly used as a synthetic intermediate, chelating agent and electronic-grade sulfur reagent.
In organic synthesis, it is the standard reagent for converting aldehydes and ketones into 1,3-dithianes, a widely used carbonyl protective group in multi-step synthesis. It also reacts with alkyl halides and epoxides to build thioether and polythioether structures, and serves as a starting material for thioester and thiocarbamate compounds.
In electronics and materials, it is used as a sulfur source and ligand in the preparation of metal sulfide nanoparticles, quantum dots and thin-film materials, and as a chelator for gold, silver and other noble-metal surface treatment.
In industrial applications, it is used as an epoxy curing accelerator, a chain transfer agent in polymer synthesis, a crosslinker in rubber and adhesives, and a complexing agent in metal-finishing and wastewater treatment.
