Diphenhydramine
Also known as: 2-benzhydryloxy-N,N-dimethylethanamine, N-[2-(BENZHYDRYLOXY)ETHYL]-N,N-DIMETHYLAMINE, n,n-dimethyl-4,4-diphenyl-3-oxabutylamine, Benzhydramine, DPH, Diphenhydramine Base
Diphenhydramine (CAS 58-73-1) is a compound in the Aromatic Hydrocarbons category listed in the Jingsj chemical database. It has the molecular formula C17H21NO and a molecular weight of 255.36100 g/mol. Key properties include a melting point of 167-172°C, a boiling point of 343.7±27.0 °C at 760 mmHg, a density of 1.0±0.1 g/cm3 and a flash point of 101.5±26.0 °C. No supplier offers are currently listed; request a quote. Record last updated Nov 4, 2026.
- CAS No.
- 58-73-1
- Jingsj CID
- J-35623-9
- Molecular Formula
- C17H21NO
- Molecular Weight
- 255.36100 g/mol
- Category
- Aromatic Hydrocarbons
- Last updated
- 11/4/2026
No offers for this compound yet.
Request a quotePhysicochemical Properties
| Melting Point | 167-172°C |
|---|---|
| Boiling Point | 343.7±27.0 °C at 760 mmHg |
| Density | 1.0±0.1 g/cm3 |
| Flash Point | 101.5±26.0 °C |
| Exact Mass | 255.162308 |
| PSA | 12.47000 |
| LogP | 3.66 |
| Vapor Pressure | 0.0±0.8 mmHg at 25°C |
| Refractive Index | 1.551 |
Activity & Biological Data
| Additional Information | [1]. Jason P Berninger, et al. Effects of the antihistamine diphenhydramine on selected aquatic organisms. Environ Toxicol Chem. 2011 Sep;30(9):2065-72. |
|---|
Customs & Trade Information
| HS Code | 2922199090 |
|---|---|
| Summary | 2922199090. other amino-alcohols, other than those containing more than one kind of oxygen function, their ethers and esters; salts thereof. VAT:17.0%. Tax rebate rate:13.0%. . MFN tariff:6.5%. General tariff:30.0% |
Frequently Asked Questions
What is the CAS number of Diphenhydramine?
The CAS number of Diphenhydramine is 58-73-1.
What are the molecular formula and molecular weight of Diphenhydramine?
Diphenhydramine has molecular formula C17H21NO and molecular weight 255.36100 g/mol.
What are the upstream and downstream products of Diphenhydramine?
For Diphenhydramine, Upstream Products: N,N-Dimethylethanolamine, Chlorodiphenylmethane, Dimethylamine; Downstream Products: 2-(Diphenylmethoxy)-N-methylethylamine, Benzhydrol.
Data compiled from public chemical databases such as PubChem and supplier catalogs; supplier offers are provided by suppliers.
Last updated:
How to cite: Jingsj. "Diphenhydramine (CAS 58-73-1)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-35623-9 (accessed 2026-11-06).
Data for reference only; verify product details with suppliers before purchase.