4-Mercaptopyridine
Also known as: 4-Pyridinethiol, Pyridine-4-thiol, 4-thiopyridine, 4(1H)-Pyridinethione, 4-Pyridyl Mercaptan, Mercaptopyridine
4-Mercaptopyridine (CAS 4556-23-4) is a compound in the Pharma Intermediates category listed in the Jingsj chemical database. It has the molecular formula C5H5NS and a molecular weight of 111.165 g/mol. Key properties include a melting point of 182-189 °C, a boiling point of 194.0±13.0 °C at 760 mmHg, a density of 1.2±0.1 g/cm3 and a flash point of 71.1±19.8 °C. It is classified under GHS with signal word Warning and hazard statements H315 — Causes skin irritation, H319 — Causes serious eye irritation and H335 — May cause respiratory irritation. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.
- CAS No.
- 4556-23-4
- Jingsj CID
- J-1088888-7
- Molecular Formula
- C5H5NS
- Molecular Weight
- 111.165 g/mol
- Category
- Pharma Intermediates
- Last updated
- 8/21/2026
No offers for this compound yet.
Request a quotePhysicochemical Properties
| Melting Point | 182-189 °C |
|---|---|
| Boiling Point | 194.0±13.0 °C at 760 mmHg |
| Density | 1.2±0.1 g/cm3 |
| Flash Point | 71.1±19.8 °C |
| Exact Mass | 111.014267 |
| PSA | 51.69000 |
| LogP | 1.03 |
| Vapor Pressure | 0.6±0.4 mmHg at 25°C |
| Refractive Index | 1.598 |
GHS Safety & Compliance
- H315 — Causes skin irritation
- H319 — Causes serious eye irritation
- H335 — May cause respiratory irritation
Customs & Trade Information
| HS Code | 2933399090 |
|---|---|
| Summary | 2933399090. other compounds containing an unfused pyridine ring (whether or not hydrogenated) in the structure. VAT:17.0%. Tax rebate rate:13.0%. . MFN tariff:6.5%. General tariff:20.0% |
Frequently Asked Questions
What is the CAS number of 4-Mercaptopyridine?
The CAS number of 4-Mercaptopyridine is 4556-23-4.
What are the molecular formula and molecular weight of 4-Mercaptopyridine?
4-Mercaptopyridine has molecular formula C5H5NS and molecular weight 111.165 g/mol.
Is 4-Mercaptopyridine hazardous?
4-Mercaptopyridine has GHS signal word Warning and hazard statements H315 — Causes skin irritation; H319 — Causes serious eye irritation; H335 — May cause respiratory irritation.
What are the upstream and downstream products of 4-Mercaptopyridine?
For 4-Mercaptopyridine, Upstream Products: 4-chloropyridine, 4-Hydroxypyridine, 4(1H)-Pyridinone; Downstream Products: 4,4'-Thiodipyridine, 4-chloropyridine, 4-Phenylpyridine.
Data compiled from public chemical databases such as PubChem and supplier catalogs; supplier offers are provided by suppliers.
Last updated:
How to cite: Jingsj. "4-Mercaptopyridine (CAS 4556-23-4)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-1088888-7 (accessed 2026-11-09).
Data for reference only; verify product details with suppliers before purchase.