(S)-(-)-α-Methoxy-α-(trifluoromethyl)phenylacetic acid
Also known as: Mosher's acid, (-)-Mosher's acid, (S)-(-)-MTPA, (S)-(-)-Mosher's acid, (S)-(-)-alpha-Methoxy-alpha-(trifluoromethyl)phenylacetic acid [Optical resolving], (-)-MTPA, (2S)-3,3,3-Trifluoro-2-methoxy-2-phenylpropanoic acid, S-(-)-alpha-Methoxy-alpha-trifluoromethylphenylacetic acid
(S)-(-)-α-Methoxy-α-(trifluoromethyl)phenylacetic acid (CAS 17257-71-5) is a compound in the Organic Acids category listed in the Jingsj chemical database. It has the molecular formula C10H9F3O3 and a molecular weight of 234.172 g/mol. Key properties include a melting point of 46-49ºC, a boiling point of 287.2±0.0 °C at 760 mmHg, a density of 1.4±0.1 g/cm3 and a flash point of 134.2±27.3 °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.
- 17257-71-5
- Jingsj CID
- J-17291-8
- Molecular Formula
- C10H9F3O3
- Molecular Weight
- 234.172 g/mol
- Category
- Organic Acids
- Last updated
- 8/21/2026
No offers for this compound yet.
Request a quotePhysicochemical Properties
| Melting Point | 46-49ºC |
|---|---|
| Boiling Point | 287.2±0.0 °C at 760 mmHg |
| Density | 1.4±0.1 g/cm3 |
| Flash Point | 134.2±27.3 °C |
| Exact Mass | 234.050385 |
| PSA | 46.53000 |
| LogP | 3.79 |
| Vapor Pressure | 0.0±0.6 mmHg at 25°C |
| Refractive Index | 1.470 |
GHS Safety & Compliance
- H315 — Causes skin irritation
- H319 — Causes serious eye irritation
- H335 — May cause respiratory irritation
Customs & Trade Information
| HS Code | 2918990090 |
|---|---|
| Summary | 2918990090. other carboxylic acids with additional oxygen function and their anhydrides, halides, peroxides and peroxyacids; their halogenated, sulphonated, nitrated or nitrosated derivatives. 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 (S)-(-)-α-Methoxy-α-(trifluoromethyl)phenylacetic acid?
The CAS number of (S)-(-)-α-Methoxy-α-(trifluoromethyl)phenylacetic acid is 17257-71-5.
What are the molecular formula and molecular weight of (S)-(-)-α-Methoxy-α-(trifluoromethyl)phenylacetic acid?
(S)-(-)-α-Methoxy-α-(trifluoromethyl)phenylacetic acid has molecular formula C10H9F3O3 and molecular weight 234.172 g/mol.
Is (S)-(-)-α-Methoxy-α-(trifluoromethyl)phenylacetic acid hazardous?
(S)-(-)-α-Methoxy-α-(trifluoromethyl)phenylacetic acid 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 (S)-(-)-α-Methoxy-α-(trifluoromethyl)phenylacetic acid?
For (S)-(-)-α-Methoxy-α-(trifluoromethyl)phenylacetic acid, Upstream Products: 2,2,2-Trifluoroacetophenone, (R)-(+)-α-Methoxy-α-(trifluoromethyl)phenylacetic acid; Downstream Products: (S)-(+)-α-Methoxy-α-(trifluoromethyl)phenylacetyl chloride, 1,3-Diisopropylurea.
Data compiled from public chemical databases such as PubChem and supplier catalogs; supplier offers are provided by suppliers.
Last updated:
How to cite: Jingsj. "(S)-(-)-α-Methoxy-α-(trifluoromethyl)phenylacetic acid (CAS 17257-71-5)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-17291-8 (accessed 2026-11-09).
Data for reference only; verify product details with suppliers before purchase.