5-Methylsalicylic acid
Synonym(s):p-Cresotic acid;2-Hydroxy-5-methylbenzoic acid
- CAS NO.：89-56-5
- Empirical Formula: C8H8O3
- Molecular Weight: 152.15
- MDL number: MFCD00002461
- EINECS: 201-918-6
- SAFETY DATA SHEET (SDS)
- Update Date: 2026-05-28 04:22:58
What is 5-Methylsalicylic acid?
Chemical properties
5-Methylsalicylic acid is a white to beige powder that is soluble in basic water and in polar organic solvents. At neutral pH, the acid exists as 5-methylsalicylate Its functional groups include a carboxylic acid and a phenol group. It is one of four isomers of methylsalicylic acid.
The Uses of 5-Methylsalicylic acid
Toxicity is similar to salicylic acid. 5-Methylsalicylic acid is used in manufacturing of dyes.
The Uses of 5-Methylsalicylic acid
5-Methylsalicylic acid was used in generation of o-sulfate conjugates in situ and their analysis by ultra-performance liquid chromatography-time-of-flight mass spectrometry.
Preparation
5-Methylsalicylic acid can be prepared by hydroxylation of 3-methylbenzoic acid.
General Description
5-Methylsalicylic acid exhibits a significant cross-reactivity during fluorescent polarization immunoassay for salicylates in serum.
Purification Methods
Crystallise the acid from H2O. [Beilstein 10 H 227, 10 II 134, 10 III 516, 10 IV 610.]
Properties of 5-Methylsalicylic acid
| Melting point: | 150-154 °C (lit.) |
| Boiling point: | 234.6°C (rough estimate) |
| Density | 1.2143 (rough estimate) |
| refractive index | 1.4945 (estimate) |
| storage temp. | Sealed in dry,Room Temperature |
| form | Powder |
| pka | pK1:4.08 (25°C) |
| color | White to beige |
| Water Solubility | 21.9g/L(100 ºC) |
| Merck | 14,2582 |
| BRN | 1909076 |
| CAS DataBase Reference | 89-56-5(CAS DataBase Reference) |
| NIST Chemistry Reference | 5-Methylsalicylic acid(89-56-5) |
Safety information for 5-Methylsalicylic acid
| Signal word | Warning |
| Pictogram(s) |
 Exclamation Mark Irritant GHS07 |
| GHS Hazard Statements |
H302:Acute toxicity,oral H315:Skin corrosion/irritation H319:Serious eye damage/eye irritation H335:Specific target organ toxicity, single exposure;Respiratory tract irritation |
| Precautionary Statement Codes |
P261:Avoid breathing dust/fume/gas/mist/vapours/spray. P264:Wash hands thoroughly after handling. P264:Wash skin thouroughly after handling. P270:Do not eat, drink or smoke when using this product. P301+P312:IF SWALLOWED: call a POISON CENTER or doctor/physician IF you feel unwell. P302+P352:IF ON SKIN: wash with plenty of soap and water. P305+P351+P338:IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continuerinsing. |
Computed Descriptors for 5-Methylsalicylic acid
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