S-Methylisothiourea hemisulfate salt
S-Methylisothiourea hemisulfate salt (CAS: 867-44-7) is a chemical compound with the formula HN=C(NH2)SCH3 · 1/2H2SO4 and a molecular weight of 139.19 g/mol. This sulfur-containing thiourea derivative serves as a versatile building block in organic synthesis. It is primarily utilised in chemical synthesis and for the preparation of various organic compounds, functioning as a key intermediate.
- IUPAC
- 2-Methyl-2-thiopseudourea hemisulfate salt,S-Methyl-ITU,S-Methylthiuronium sulfate,SMT
- Synonyms
- 2-Methyl-2-thiopseudourea hemisulfate saltS-Methyl-ITUS-Methylthiuronium sulfateSMT

Organic Synthesis Intermediate
S-Methylisothiourea hemisulfate salt is employed as a crucial intermediate in the synthesis of more complex organic molecules. Its reactive functional groups allow for diverse chemical transformations.
Building Block for Heterocycles
This compound can be utilised as a structural motif for the construction of various heterocyclic compounds, which are important in medicinal chemistry and materials science.
Reagent in Chemical Research
It serves as a reagent in laboratory settings for research and development purposes, enabling chemists to explore novel reaction pathways and develop new chemical entities.
| Molecular weight | 139.19 |
|---|---|
| Linear formula | HN=C(NH2)SCH3 · 1/2H2SO4 |
| Assay | ≥98.0% (T) |
| Solubility | H2O: soluble0.1 g/mL, clear, colorless |
| Melting point | 240-241 °C (dec.)(lit.) |

Hazard statements
- H302Harmful if swallowed
| Protective equipment | dust mask type N95 (US), Eyeshields, Gloves |
|---|---|
| Water hazard class (WGK, DE) | 3 |
| Hazard codes (EU) | Xn |
| Risk statements (R) | 22 |
Hazard information is provided for guidance. Always consult the product Safety Data Sheet (SDS), available on request, before handling.
Documentation
Every batch ships with a Certificate of Analysis covering assay, identity and purity; the grade is confirmed against your enquiry. Safety Data Sheets and technical data sheets are available on request.
Supply & logistics
Samples for technical evaluation; bulk MOQ by grade and packaging. In-stock material ships in 7–10 working days, worldwide, with full export documentation.
What is S-Methylisothiourea hemisulfate salt used for?
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S-Methylisothiourea hemisulfate salt is primarily used as a building block and intermediate in organic synthesis and chemical research.
What are the CAS number and chemical formula for S-Methylisothiourea hemisulfate salt?
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The CAS number is 867-44-7, and the chemical formula is HN=C(NH2)SCH3 · 1/2H2SO4.
What grade and purity does Tech Serve Solutions supply?
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Tech Serve Solutions supplies S-Methylisothiourea hemisulfate salt with an assay of ≥98.0% (T). We do not represent this product as USP, BP, or EP grade.
How should S-Methylisothiourea hemisulfate salt be handled safely?
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This compound is harmful if swallowed (H302). Handle with appropriate personal protective equipment including a dust mask (type N95), eyeshields, and gloves. Avoid ingestion and dust formation.
Does TSS export S-Methylisothiourea hemisulfate salt?
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Yes, Tech Serve Solutions is a specialist global supplier and exporter of fine chemicals, including S-Methylisothiourea hemisulfate salt.
How can I request a quote or sample for S-Methylisothiourea hemisulfate salt?
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To request a quote or a sample, please contact our sales team through the website or via direct enquiry, providing your specific requirements.
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