(R)-Naproxen

Also known as: (R)-2-(6-Methoxynaphthalen-2-yl)propanoic acid, (R)-(-)-6-Methoxy-α-methyl-2-naphthaleneacetic acid, (R)-6-Methoxy-α-methyl-2-naphthaleneacetic acid, (R)-2-(6-Methoxy-2-naphthyl)propionic acid, (2R)-2-(6-Methoxynaphthalen-2-yl)propanoic acid, MFCD00870716, Naproxen EP Impurity G, Naproxen USP RC G

(R)-Naproxen (CAS 23979-41-1) is a compound in the Aromatic Hydrocarbons category listed in the Jingsj chemical database. It has the molecular formula C14H14O3 and a molecular weight of 230.259 g/mol. Key properties include a melting point of 156-158ºC(lit.), a boiling point of 403.9±20.0 °C at 760 mmHg, a density of 1.2±0.1 g/cm3 and a flash point of 154.5±15.3 °C. It is classified under GHS with signal word Warning and hazard statements H302 — Harmful if swallowed. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.

CAS No.: 23979-41-1
Jingsj CID: J-28917-8
Molecular Formula: C₁₄H₁₄O₃
Molecular Weight: 230.259 g/mol
Category: Aromatic Hydrocarbons
Last updated: 8/21/2026

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Physicochemical Properties

Melting Point	156-158ºC(lit.)
Boiling Point	403.9±20.0 °C at 760 mmHg
Density	1.2±0.1 g/cm3
Flash Point	154.5±15.3 °C
Exact Mass	230.094299
PSA	46.53000
LogP	3.00
Vapor Pressure	0.0±1.0 mmHg at 25°C
Refractive Index	1.609
Storage Conditions	2-8°C

GHS Safety & Compliance

IrritantSignal word: Warning

H302 — Harmful if swallowed

Activity & Biological Data

Additional Information	[1]. Sonika Batra, et al. Enantiomeric Resolution of (RS)-Naproxen and Application of (S)- Naproxen in the Direct and Indirect Enantioseparation of Racemic Compounds by Liquid Chromatography: A Review. Curr Med Chem. 2017;24(8):758-780. [2]. M Iwaki, et al. Stereoselective disposition of naproxen glucuronide in the rat. Drug Metab Dispos. 1995 Oct;23(10):1099-103. [3]. Tudor I Oprea, et al. Novel Activities of Select NSAID R-Enantiomers against Rac1 and Cdc42 GTPases. PLoS One. 2015 Nov 11;10(11):e0142182.

Additional Information

[1]. Sonika Batra, et al. Enantiomeric Resolution of (RS)-Naproxen and Application of (S)- Naproxen in the Direct and Indirect Enantioseparation of Racemic Compounds by Liquid Chromatography: A Review. Curr Med Chem. 2017;24(8):758-780. [2]. M Iwaki, et al. Stereoselective disposition of naproxen glucuronide in the rat. Drug Metab Dispos. 1995 Oct;23(10):1099-103. [3]. Tudor I Oprea, et al. Novel Activities of Select NSAID R-Enantiomers against Rac1 and Cdc42 GTPases. PLoS One. 2015 Nov 11;10(11):e0142182.

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 (R)-Naproxen?

The CAS number of (R)-Naproxen is 23979-41-1.

What are the molecular formula and molecular weight of (R)-Naproxen?

(R)-Naproxen has molecular formula C14H14O3 and molecular weight 230.259 g/mol.

Is (R)-Naproxen hazardous?

(R)-Naproxen has GHS signal word Warning and hazard statements H302 — Harmful if swallowed.

What are the upstream and downstream products of (R)-Naproxen?

For (R)-Naproxen, Upstream Products: 2-Methoxy-6-vinylnaphthalene, 2-Bromo-6-methoxynaphthalene; Downstream Products: (S)-Methyl 2-(6-methoxynaphthalen-2-yl)propanoate.

Data compiled from public chemical databases such as PubChem and supplier catalogs; supplier offers are provided by suppliers.

Last updated: 8/21/2026

How to cite: Jingsj. "(R)-Naproxen (CAS 23979-41-1)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-28917-8 (accessed 2026-11-09).

Data for reference only; verify product details with suppliers before purchase.