Molekula
Methyl p-toluenesulfonate
Supplying 4,500+ customers in over 80 countries
ISO 9001:2015 & ISO 14001:2015 certified · Supplying laboratories and industry since 2000 · Listed pack sizes are a starting point — we manufacture, source and repack to the quantity you need
Methyl p-toluenesulfonate (MeOTs) is a sulfonate ester widely used as a methylating agent in organic synthesis, particularly for converting alcohols to methyl ethers and in the preparation of quaternary ammonium salts. It is also employed in pharmaceutical and agrochemical intermediate production due to its high reactivity and selectivity. Industrially, it also serves as a catalyst and accelerator for alkyd resins and as an intermediate in the manufacture of basic dyes. This chemical has a CAS number of 80-48-8, with the molecular formula CH3C6H4SO3CH3 and a molecular weight of 186.23. It must be stored between 2 to 8°C and is classified with the signal word "Danger." Molekula supplies Methyl p-toluenesulfonate from research to bulk quantities with full documentation and ISO 9001:2015 traceability.
Example image for illustration only. Other packaging and pack sizes are available.
Pricing & pack sizes
These pack sizes aren't a limit. Molekula manufactures, sources and repacks to order — if you need 500 kg and only see 1 kg listed, . We quote from grams to multi-tonne.
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500 g — $144.70 per pack
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Specifications
| Property | Value |
|---|---|
| Appearance | Clear to off white to yellow solid (melt) |
| Melting Point | 24-29 °C (lit.) |
| Ash | ≤ 0.1% |
| Purity | ≥ 98% |
| Moisture | ≤ 0.5% |
| p-toluenesulfonic acid | ≤ 0.5% |
Storage & handling
| Property | Value |
|---|---|
| Storage Temperature | 2 to 8 °C |
| Transport Class | 8 |
| Packing Group | II |
| Acidity | Acid |
Literature values
Published physical properties of the substance, not batch specifications.
| Property | Value |
|---|---|
| Appearance | Light brown crystals |
| Melting Point | 28-29 °C |
| Boiling Point | 292 °C at 760 mmHg |
Source: PubChem CID 6645 (HSDB)
Identification
| Property | Value |
|---|---|
| SKU | 22186798 |
| CAS Number | 80-48-8 |
| IUPAC Name | methyl 4-methylbenzenesulfonate |
| EC Number | 201-283-5 |
| Molecular Formula | CH3C6H4SO3CH3 |
| Molecular Weight | 186.23 |
| Exact Mass | 186.0351 |
| SMILES | CC1=CC=C(C=C1)S(=O)(=O)OC |
| InChIKey | VUQUOGPMUUJORT-UHFFFAOYSA-N |
| InChI | InChI=1S/C8H10O3S/c1-7-3-5-8(6-4-7)12(9,10)11-2/h3-6H,1-2H3 |
| PubChem CID | 6645 |
| UN Number | UN3261 |
| REACH Code | Y110 |
| TSCA Listed | Yes |
| HTS Code | 29051990 |
| Tariff Code | 2905190098 |
Safety & GHS
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Corrosive
GHS05
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Health Hazard
GHS07
Hazard statements
- H302 Harmful if swallowed
- H314 (sub cat. 1B) Causes severe skin burns and eye damage
- H317 May cause an allergic skin reaction
Precautionary statements
- P280 Wear protective gloves/protective clothing/eye protection/face protection
- P301+312 IF SWALLOWED: Call a POISON CENTER or doctor/physician if you feel unwell
- P302+352 IF ON SKIN: Wash with soap and water
- P305+351+338 IF IN EYES: Rinse with water for several minutes. Remove contact lenses if present and easy to do. Continue rinsing
Documents
Safety Data Sheets (SDS)
Available in English, French, German, Italian, Russian, Spanish.
Certificate of Analysis (CoA) by batch
Enter a lot or batch number to retrieve the CoA for that specific batch. We can generate one from spec data if no PDF is on file.
Synonyms
- Benzenesulfonic acid, 4-methyl-, methyl ester
- Methyl 4-methylbenzenesulfonate
- METHYL P-METHYLBENZENESULFONATE
- Methyl p-tosylate
- Methyl toluene-4-sulfonate
- Methyl toluene-4-sulphonate
- Methyl toluenesulfonate
- Methyl tosylate
- p-Methylbenzenesulfonate methyl ester
- p-Toluenesulfonic acid, methyl ester
Frequently asked questions
What is methyl p-toluenesulfonate commonly used for?
Methyl p-toluenesulfonate is primarily used as an alkylating agent in organic synthesis, including the preparation of quaternary ammonium salts and pharmaceutical intermediates.
What is the chemical formula and molecular weight of methyl p-toluenesulfonate?
The chemical formula is **CH₃C₆H₄SO₃CH₃**, and the molecular weight is **186.23 g/mol**.
How should methyl p-toluenesulfonate be stored?
Store at **2–8°C** in a cool, dry place, away from incompatible substances, and ensure proper ventilation.
What grades of methyl p-toluenesulfonate does Molekula supply?
Molekula supplies **analytical and synthesis-grade** methyl p-toluenesulfonate, meeting high-purity standards for research and development.
Can Molekula supply methyl p-toluenesulfonate in bulk quantities?
Yes, Molekula can provide bulk quantities of methyl p-toluenesulfonate upon request, subject to availability and order specifications.
What documentation comes with an order of methyl p-toluenesulfonate?
Each order includes a **Certificate of Analysis (CoA)**, Material Safety Data Sheet (MSDS), and a product specification sheet.
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