2,6,6-Trimethyl-2-cyclohexene-1,4-dione
Also known as: 4-Oxoisophorone, Ketoisophorone, 4-Ketoisophorone, 2-Cyclohexene-1,4-dione, 2,6,6-trimethyl-, FEMA 3421
2,6,6-Trimethyl-2-cyclohexene-1,4-dione (CAS 1125-21-9) is a compound in the Ketones category listed in the Jingsj chemical database. It has the molecular formula C9H12O2 and a molecular weight of 152.190 g/mol. Key properties include a melting point of 26-28 °C(lit.), a boiling point of 214.2±0.0 °C at 760 mmHg, a density of 1.0±0.1 g/cm3 and a flash point of 96.1±0.0 °C. It is classified under GHS with signal word Warning and hazard statements H302 — Harmful if swallowed and H317 — May cause an allergic skin reaction. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.
- CAS No.
- 1125-21-9
- Jingsj CID
- J-15631-6
- Molecular Formula
- C9H12O2
- Molecular Weight
- 152.190 g/mol
- Category
- Ketones
- Last updated
- 8/21/2026
No offers for this compound yet.
Request a quotePhysicochemical Properties
| Melting Point | 26-28 °C(lit.) |
|---|---|
| Boiling Point | 214.2±0.0 °C at 760 mmHg |
| Density | 1.0±0.1 g/cm3 |
| Flash Point | 96.1±0.0 °C |
| Exact Mass | 152.083725 |
| PSA | 34.14000 |
| LogP | 0.76 |
| Vapor Pressure | 0.2±0.4 mmHg at 25°C |
| Refractive Index | 1.469 |
GHS Safety & Compliance
- H302 — Harmful if swallowed
- H317 — May cause an allergic skin reaction
Activity & Biological Data
| Additional Information | [1]. Hegazy ME, et al. Ketoisophorone transformation by Marchantia polymorpha and Nicotiana tabacum cultured cells. Z Naturforsch C. 2008 May-Jun;63(5-6):403-8. |
|---|
Customs & Trade Information
| HS Code | 2914299000 |
|---|---|
| Summary | 2914299000. other cyclanic, cyclenic or cyclotherpenic ketones without other oxygen function. VAT:17.0%. Tax rebate rate:13.0%. . MFN tariff:5.5%. General tariff:30.0% |
Frequently Asked Questions
What is the CAS number of 2,6,6-Trimethyl-2-cyclohexene-1,4-dione?
The CAS number of 2,6,6-Trimethyl-2-cyclohexene-1,4-dione is 1125-21-9.
What are the molecular formula and molecular weight of 2,6,6-Trimethyl-2-cyclohexene-1,4-dione?
2,6,6-Trimethyl-2-cyclohexene-1,4-dione has molecular formula C9H12O2 and molecular weight 152.190 g/mol.
Is 2,6,6-Trimethyl-2-cyclohexene-1,4-dione hazardous?
2,6,6-Trimethyl-2-cyclohexene-1,4-dione has GHS signal word Warning and hazard statements H302 — Harmful if swallowed; H317 — May cause an allergic skin reaction.
What are the upstream and downstream products of 2,6,6-Trimethyl-2-cyclohexene-1,4-dione?
For 2,6,6-Trimethyl-2-cyclohexene-1,4-dione, Upstream Products: 3,5,5-trimethylcyclohex-3-en-1-one, Isophorone, alpha-Ionone; Downstream Products: 2,2,6-Trimethylcyclohexanone, 3,5,5-Trimethylcyclohexane-1,4-dione.
Data compiled from public chemical databases such as PubChem and supplier catalogs; supplier offers are provided by suppliers.
Last updated:
How to cite: Jingsj. "2,6,6-Trimethyl-2-cyclohexene-1,4-dione (CAS 1125-21-9)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-15631-6 (accessed 2026-11-06).
Data for reference only; verify product details with suppliers before purchase.