Trimethyl orthoformate
Also known as: Trimethoxymethane, Methyl orthoformate, Orthoformic acid trimethyl ester, Trimethyl orthoformate, Methane, trimethoxy-, TMOF
Trimethyl orthoformate (CAS 149-73-5) is a compound in the Organic Acids category listed in the Jingsj chemical database. It has the molecular formula C4H10O3 and a molecular weight of 106.120 g/mol. Key properties include a melting point of -53 °C, a boiling point of 104.0±0.0 °C at 760 mmHg, a density of 0.9±0.1 g/cm3 and a flash point of 15.6±0.0 °C. It is classified under GHS with signal word Danger and hazard statements H225 — Highly flammable liquid and vapour and H319 — Causes serious eye irritation. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.
- CAS No.
- 149-73-5
- Jingsj CID
- J-1370126-3
- Molecular Formula
- C4H10O3
- Molecular Weight
- 106.120 g/mol
- Category
- Organic Acids
- Last updated
- 8/21/2026
No offers for this compound yet.
Request a quotePhysicochemical Properties
| Melting Point | -53 °C |
|---|---|
| Boiling Point | 104.0±0.0 °C at 760 mmHg |
| Density | 0.9±0.1 g/cm3 |
| Flash Point | 15.6±0.0 °C |
| Exact Mass | 106.062996 |
| PSA | 27.69000 |
| LogP | 0.55 |
| Additional Property | 3.67 (vs air) |
| Vapor Pressure | 36.5±0.1 mmHg at 25°C |
| Refractive Index | 1.370 |
| Additional Property | 10 g/L (hydrolysis) |
GHS Safety & Compliance
- H225 — Highly flammable liquid and vapour
- H319 — Causes serious eye irritation
Customs & Trade Information
| HS Code | 2909199090 |
|---|---|
| Summary | 2909199090. other acyclic ethers and their halogenated, sulphonated, nitrated or nitrosated derivatives. 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 Trimethyl orthoformate?
The CAS number of Trimethyl orthoformate is 149-73-5.
What are the molecular formula and molecular weight of Trimethyl orthoformate?
Trimethyl orthoformate has molecular formula C4H10O3 and molecular weight 106.120 g/mol.
Is Trimethyl orthoformate hazardous?
Trimethyl orthoformate has GHS signal word Danger and hazard statements H225 — Highly flammable liquid and vapour; H319 — Causes serious eye irritation.
What are the upstream and downstream products of Trimethyl orthoformate?
For Trimethyl orthoformate, Upstream Products: 1'-Acetonaphthone, 4'-Methoxyacetophenone, Methanol; Downstream Products: Methyl perfluorooctanoate, 2,3-Dimethoxy-1,3-butadiene, (1,1-Dimethoxyethyl)benzene.
Data compiled from public chemical databases such as PubChem and supplier catalogs; supplier offers are provided by suppliers.
Last updated:
How to cite: Jingsj. "Trimethyl orthoformate (CAS 149-73-5)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-1370126-3 (accessed 2026-11-09).
Data for reference only; verify product details with suppliers before purchase.