Molekula
Sodium thiomethoxide (Sodium methyl mercaptide)
Supplying 4,500+ customers in over 80 countries
ISO 9001:2015 & ISO 14001:2015 certified · Supplying laboratories and industry since 1999 · Listed pack sizes are a starting point — we manufacture, source and repack to the quantity you need
Sodium thiomethoxide (sodium methyl mercaptide) is a reactive organosulfur compound used in organic synthesis, particularly in the preparation of thioethers and as a nucleophile in various reactions. It is available as a solid or in solution, typically stored at ambient temperature. CAS: 5188-07-8, Molecular formula: CH3NaS, Molecular weight: 70.09. Molekula supplies Sodium thiomethoxide 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
On backorder — expected to ship by 25 November 2026
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.
Need a different size? Add the nearest pack and change the size in your basket — we price it at the same rate per unit.
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5 g — £86.60 per pack ex VAT · £103.92 inc. VAT
Need a different quantity or pack?
Tell us how much you need and when — drums, IBCs, sacks or a one-off bulk lot. We'll manufacture or source it and come back with a price.
Prices exclude VAT/sales tax and shipping.
Specifications
Specifications available on request — see Documents below or contact our sales team.
Storage & handling
| Property | Value |
|---|---|
| Storage Temperature | Ambient |
| Flash Point | 27 °C |
| Transport Class | 8 (4.1) |
| Packing Group | II |
| Acidity | Base |
Literature values
Published physical properties of the substance, not batch specifications.
| Property | Value |
|---|---|
| Vapour Pressure | 0.00000108 mmHg |
Source: PubChem CID 4378561 (Haz-Map)
Identification
| Property | Value |
|---|---|
| SKU | 77969456 |
| CAS Number | 5188-07-8 |
| IUPAC Name | sodium methanethiolate |
| EC Number | 225-969-9 |
| Molecular Formula | CH3NaS |
| Molecular Weight | 70.09 |
| Exact Mass | 69.9853 |
| SMILES | C[S-].[Na+] |
| InChIKey | RMBAVIFYHOYIFM-UHFFFAOYSA-M |
| InChI | InChI=1S/CH4S.Na/c1-2;/h2H,1H3;/q;+1/p-1 |
| PubChem CID | 4378561 |
| UN Number | UN2921 |
| REACH Code | Y110 |
| TSCA Listed | Yes |
| HTS Code | 2930.90.9255 |
| Tariff Code | 2930909599 |
Safety & GHS
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Flammable
GHS02
-
Corrosive
GHS05
-
Toxic
GHS06
Hazard statements
- H228 Flammable solid
- H301 + H311 + H331 Toxic if swallowed, in contact with skin or if inhaled
- H314 (sub cat. 1A) Causes severe skin burns and eye damage
- H318 Causes serious eye damage
Precautionary statements
- P210 Keep away from heat/sparks/open flames/hot surfaces - No smoking
- P260 Do not breathe dust/fume/gas/mist/vapours/spray
- P280 Wear protective gloves/protective clothing/eye protection/face protection
- P301+310 IF SWALLOWED: Immediately call a POISON CENTER or doctor/physician
- P302+P334 IF ON SKIN: Immerse in cool water/wrap in wet bandages
- P304+P340 IF INHALED: Remove victim to fresh air and keep at rest in a position comfortable for breathing
- P305+351+338 IF IN EYES: Rinse with water for several minutes. Remove contact lenses if present and easy to do. Continue rinsing
- P308+313 IF exposed or concerned: Get medical advice/attention
Documents
Safety Data Sheets (SDS)
Available in English, German, Spanish, French, Italian, Portuguese, Arabic, Dutch.
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.
Quality certificates
Molekula Group is certified to ISO 9001:2015 (quality) and ISO 14001:2015 (environmental management), audited by a UKAS-accredited body. Both certificates are valid to 17 May 2028.
Synonyms
- Methanethiol sodium salt
- Methanethiol, sodium salt (1:1)
- methylsulfanylsodium
- sodium metanethiolate
- Sodium methanethiolate
- Sodium Methanethiolate (95per cent)
- sodium methanthiolat
- sodium methyl mercaptide
- Sodium thiomethoxide
- Sodium thiomethylate
Frequently asked questions
What is sodium thiomethoxide used for?
Sodium thiomethoxide is primarily used as a nucleophilic reagent in organic synthesis, particularly in the preparation of thioethers and other sulfur-containing compounds.
What is the chemical formula and molecular weight of sodium thiomethoxide?
The formula is CH3NaS with a molecular weight of 70.09 g/mol.
How should sodium thiomethoxide be stored?
It should be stored at ambient temperature, protected from moisture and air to prevent degradation.
What grade of sodium thiomethoxide does Molekula supply?
Molekula supplies sodium thiomethoxide in reagent grade.
Can Molekula supply sodium thiomethoxide in bulk?
Yes, Molekula can supply sodium thiomethoxide in bulk quantities; please contact our sales team for details.
What documentation comes with a purchase of sodium thiomethoxide?
Each order includes a Certificate of Analysis (CoA) and Safety Data Sheet (SDS) with the shipment.
Ready to order or need a custom pack?
Tell us the product, grade, and quantity — Molekula usually responds within one working day with pricing and lead time.