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3-Hydroxy-4-methoxybenzoic acid

3-羟基-4-甲氧基苯甲酸

Also known as: Isovanillic acid, 4-Methoxy-3-hydroxybenzoic acid, 3-Hydroxyanisic acid, 3-Hydroxy-p-anisic acid, 4-Methoxy-protocatechuic acid, Acide isovanillique

3-Hydroxy-4-methoxybenzoic acid (CAS 645-08-9) is a compound in the Organic Acids category listed in the Jingsj chemical database. It has the molecular formula C8H8O4 and a molecular weight of 168.147 g/mol. It is also known as Isovanillic acid, 4-Methoxy-3-hydroxybenzoic acid and 3-Hydroxyanisic acid. Key properties include a melting point of 250-253 °C(lit.), a boiling point of 344.3±27.0 °C at 760 mmHg, a density of 1.4±0.1 g/cm3 and a flash point of 145.2±17.2 °C. GHS signal word: Warning. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.

CAS No.
645-08-9
Jingsj CID
J-44857-8
Molecular Formula
C8H8O4
Chinese Name
3-羟基-4-甲氧基苯甲酸
Molecular Weight
168.147 g/mol
Category
Organic Acids
Last updated
8/21/2026

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Physicochemical Properties

Melting Point250-253 °C(lit.)
Boiling Point344.3±27.0 °C at 760 mmHg
Density1.4±0.1 g/cm3
Flash Point145.2±17.2 °C

GHS Safety & Compliance

IrritantSignal word: Warning

Frequently Asked Questions

What is the CAS number of 3-Hydroxy-4-methoxybenzoic acid?

The CAS number of 3-Hydroxy-4-methoxybenzoic acid is 645-08-9.

What are the molecular formula and molecular weight of 3-Hydroxy-4-methoxybenzoic acid?

3-Hydroxy-4-methoxybenzoic acid has molecular formula C8H8O4 and molecular weight 168.147 g/mol.

Is 3-Hydroxy-4-methoxybenzoic acid hazardous?

3-Hydroxy-4-methoxybenzoic acid has GHS signal word Warning.

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

Last updated:

How to cite: Jingsj. "3-Hydroxy-4-methoxybenzoic acid (CAS 645-08-9)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-44857-8 (accessed 2026-10-23).

Data for reference only; verify specifications, grades and regulatory status with suppliers before purchase.