1-Octylphosphonic acid

Also known as: 1-Octanephosphonic acid, octylphosphonic acid, n-Octylphosphonic acid, Octylphosphonic acid, Phosphonic acid, octyl-, n-Octylphosphonicacid, Octanephosphonic acid, Octylphosphonsure, Phosphonic acid, octyl- (6CI,7CI,8CI,9CI), N-OCTYLPHOSPHONIC ACID, MFCD00015841, EINECS 225-218-5, n-Octylphosphonic acid, min. 97%, n-octane phosphonic acid, octyl-Phosphonicacid, 1-Octylphosphonicacid, 1-Octylphosphonicacid,98%, octyl-phosphonic acid, n-Octyl-1-phosphonic acid

1-Octylphosphonic acid (CAS 4724-48-5) is a compound in the Organic Acids category listed in the Jingsj chemical database. It has the molecular formula C8H19O3P and a molecular weight of 194.208 g/mol. Key properties include a melting point of 100-102ºC, a boiling point of 327.5±25.0 °C at 760 mmHg, a density of 1.1±0.1 g/cm3 and a flash point of 151.8±23.2 °C. It is classified under GHS with signal word Danger and hazard statements H302 — Harmful if swallowed, H314 — Causes severe skin burns and eye damage and H373 — May cause damage to organs through prolonged exposure. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.

CAS No.: 4724-48-5
Jingsj CID: J-1409856-7
Molecular Formula: C₈H₁₉O₃P
Molecular Weight: 194.208 g/mol
Category: Organic Acids
Last updated: 8/21/2026

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Physicochemical Properties

Melting Point	100-102ºC
Boiling Point	327.5±25.0 °C at 760 mmHg
Density	1.1±0.1 g/cm3
Flash Point	151.8±23.2 °C
Exact Mass	194.107178
PSA	67.34000
LogP	1.70
Appearance	Powder \| white to off-white
Vapor Pressure	0.0±1.5 mmHg at 25°C
Refractive Index	1.458
Additional Property	Slightly soluble in organic solvents and water.

GHS Safety & Compliance

Corrosion / Irritant / Health HazardSignal word: Danger

H302 — Harmful if swallowed
H314 — Causes severe skin burns and eye damage
H373 — May cause damage to organs through prolonged exposure

Frequently Asked Questions

What is the CAS number of 1-Octylphosphonic acid?

The CAS number of 1-Octylphosphonic acid is 4724-48-5.

What are the molecular formula and molecular weight of 1-Octylphosphonic acid?

1-Octylphosphonic acid has molecular formula C8H19O3P and molecular weight 194.208 g/mol.

Is 1-Octylphosphonic acid hazardous?

1-Octylphosphonic acid has GHS signal word Danger and hazard statements H302 — Harmful if swallowed; H314 — Causes severe skin burns and eye damage; H373 — May cause damage to organs through prolonged exposure.

What are the upstream and downstream products of 1-Octylphosphonic acid?

For 1-Octylphosphonic acid, Upstream Products: octene, Diethyl 1-octylphosphonate, 1-Bromooctane; Downstream Products: 1-Octylphosphonic dichloride.

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. "1-Octylphosphonic acid (CAS 4724-48-5)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-1409856-7 (accessed 2026-11-09).

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