2,4-Diaminopyrimidine
Also known as: Pyrimidine-2,4-diamine, 2,4-Pyrimidinediamine, DAP, NSC 30856
2,4-Diaminopyrimidine (CAS 156-81-0) is a compound in the Pharma Intermediates category listed in the Jingsj chemical database. It has the molecular formula C4H6N4 and a molecular weight of 110.117 g/mol. Key properties include a melting point of 143-147 °C(lit.), a boiling point of 401.7±37.0 °C at 760 mmHg, a density of 1.4±0.1 g/cm3 and a flash point of 225.6±13.7 °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.
- 156-81-0
- Jingsj CID
- J-33251-4
- Molecular Formula
- C4H6N4
- Molecular Weight
- 110.117 g/mol
- Category
- Pharma Intermediates
- Last updated
- 8/21/2026
No offers for this compound yet.
Request a quotePhysicochemical Properties
| Melting Point | 143-147 °C(lit.) |
|---|---|
| Boiling Point | 401.7±37.0 °C at 760 mmHg |
| Density | 1.4±0.1 g/cm3 |
| Flash Point | 225.6±13.7 °C |
| Exact Mass | 110.059242 |
| PSA | 77.82000 |
| LogP | -0.64 |
| Vapor Pressure | 0.0±0.9 mmHg at 25°C |
| Refractive Index | 1.695 |
| Storage Conditions | Refrigerator (+4°C) |
| Additional Property | 840 g/L (25 ºC) |
GHS Safety & Compliance
- H315 — Causes skin irritation
- H319 — Causes serious eye irritation
- H335 — May cause respiratory irritation
Customs & Trade Information
| HS Code | 2933599090 |
|---|---|
| Summary | 2933599090. other compounds containing a pyrimidine ring (whether or not hydrogenated) or piperazine ring 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 2,4-Diaminopyrimidine?
The CAS number of 2,4-Diaminopyrimidine is 156-81-0.
What are the molecular formula and molecular weight of 2,4-Diaminopyrimidine?
2,4-Diaminopyrimidine has molecular formula C4H6N4 and molecular weight 110.117 g/mol.
Is 2,4-Diaminopyrimidine hazardous?
2,4-Diaminopyrimidine 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 2,4-Diaminopyrimidine?
For 2,4-Diaminopyrimidine, Upstream Products: Bis(pinacolato)diboron, (E)-3-Ethoxyacrylonitrile, Guanidine hydrochloride; Downstream Products: 4-Methyl-2-(methylsulfanyl)pyrimidine, 2,4-Diaminopyrimidine 3-oxide, imidazo[1,2-a]pyrimidin-7-amine.
Data compiled from public chemical databases such as PubChem and supplier catalogs; supplier offers are provided by suppliers.
Last updated:
How to cite: Jingsj. "2,4-Diaminopyrimidine (CAS 156-81-0)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-33251-4 (accessed 2026-11-09).
Data for reference only; verify product details with suppliers before purchase.