Phenolphthalin
Also known as: 2-[bis(4-hydroxyphenyl)methyl]benzoic acid, 2-(4,4'-dihydroxybenzhydryl)benzoic acid, alpha,alpha-bis(4-hydroxyphenyl)-o-toluic acid, dihydrophenolphthalein, PHENOLTHALEIN, Phenolphthalin [for redox indicator]
Phenolphthalin (CAS 81-90-3) is a compound in the Alcohols category listed in the Jingsj chemical database. It has the molecular formula C20H16O4 and a molecular weight of 320.33900 g/mol. Key properties include a melting point of 238ºC, a boiling point of 548.7ºC at 760 mmHg, a density of 1.323g/cm3 and a flash point of 299.7ºC. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.
- CAS No.
- 81-90-3
- Jingsj CID
- J-9176-3
- Molecular Formula
- C20H16O4
- Molecular Weight
- 320.33900 g/mol
- Category
- Alcohols
- Last updated
- 8/21/2026
No offers for this compound yet.
Request a quotePhysicochemical Properties
| Melting Point | 238ºC |
|---|---|
| Boiling Point | 548.7ºC at 760 mmHg |
| Density | 1.323g/cm3 |
| Flash Point | 299.7ºC |
| Exact Mass | 320.10500 |
| PSA | 77.76000 |
| LogP | 3.97620 |
| Refractive Index | 1.5400 (estimate) |
Frequently Asked Questions
What is the CAS number of Phenolphthalin?
The CAS number of Phenolphthalin is 81-90-3.
What are the molecular formula and molecular weight of Phenolphthalin?
Phenolphthalin has molecular formula C20H16O4 and molecular weight 320.33900 g/mol.
What are the upstream and downstream products of Phenolphthalin?
For Phenolphthalin, Upstream Products: Phenolphthalein, Phthalic anhydride, Phenol; Downstream Products: Tetraiodophenolphthalein, 1,1,2,2-Tetrakis(4-hydroxyphenyl)ethane, 4,4'-Dihydroxybenzophenone.
Data compiled from public chemical databases such as PubChem and supplier catalogs; supplier offers are provided by suppliers.
Last updated:
How to cite: Jingsj. "Phenolphthalin (CAS 81-90-3)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-9176-3 (accessed 2026-11-06).
Data for reference only; verify product details with suppliers before purchase.