3-(Methylthio)propionaldehyde
3-(Methylthio)propionaldehyde (CAS 3268-49-3), with the chemical formula CH3SCH2CH2CHO and a molecular weight of 104.17 g/mol, is a key organic building block. This aldehyde is notable for its application as a biosynthetic precursor to ethylene. Tech Serve Solutions offers this compound, important in chemical synthesis, for research and development purposes.
- IUPAC
- 3-(Methylmercapto)propionaldehyde,3-(Methylthio)propanal,Methional,NSC 15874
- Synonyms
- Methional3-(Methylmercapto)propionaldehyde3-(Methylthio)propanalNSC 15874

Biosynthetic Precursor
3-(Methylthio)propionaldehyde is recognised for its role as a biosynthetic precursor to ethylene. This application is significant in biochemical research and studies of plant hormone synthesis.
Chemical Synthesis Intermediate
As a functionalised aldehyde with a thioether group, this compound serves as a versatile intermediate in organic synthesis. It can be utilised in the construction of more complex molecules within research laboratories.
Organic Building Block
The specific arrangement of functional groups in 3-(Methylthio)propionaldehyde makes it a valuable building block for chemists. It is suitable for creating novel compounds and exploring new synthetic pathways.
| Molecular weight | 104.17 |
|---|---|
| Linear formula | CH3SCH2CH2CHO |
| Boiling point | 165-166 °C(lit.) |
| Density | 1.043 g/mL at 25 °C(lit.) |
| Refractive index | n20/D 1.483(lit.) |
| Vapour pressure | 760 mmHg (165 °C) |
| Vapour density | >1 (vs air) |
| Storage temperature | 2-8°C |
| Application | 3-(Methylthio)propionaldehyde (3-methylthiopropanal) has been employed as biosynthetic precursor of ethylene1. |


Hazard statements
- H302Harmful if swallowed
- H314Causes severe skin burns and eye damage
- H331Toxic if inhaled
Precautionary statements
- P261Avoid breathing dust, fume, gas or vapours
- P280Wear protective gloves, clothing and eye/face protection
- P305IF IN EYES
- P310Immediately call a POISON CENTER or doctor
| Protective equipment | Faceshields, full-face respirator (US), Gloves, Goggles, multi-purpose combination respirator cartridge (US), type ABEK (EN14387) respirator filter |
|---|---|
| Flash point | 74 °C / 165.2 °F |
| Transport (UN / ADR) | UN 2785 6.1 / PGIII |
| Water hazard class (WGK, DE) | 1 |
| Hazard codes (EU) | C |
| Risk statements (R) | 20/22-34 |
| Safety statements (S) | 26-36/37/39-45 |
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 3-(Methylthio)propionaldehyde used for?
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3-(Methylthio)propionaldehyde is primarily used as a biosynthetic precursor to ethylene and as a versatile intermediate in chemical synthesis and organic building block applications.
What are the CAS number and chemical formula for 3-(Methylthio)propionaldehyde?
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The CAS number for 3-(Methylthio)propionaldehyde is 3268-49-3, and its chemical formula is CH3SCH2CH2CHO.
What grade and purity does Tech Serve Solutions supply?
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Tech Serve Solutions supplies 3-(Methylthio)propionaldehyde typically as a technical or research grade product. We do not represent this product as USP, BP, EP, or any other pharmacopoeia grade unless explicitly stated in the product documentation.
How should 3-(Methylthio)propionaldehyde be handled safely?
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3-(Methylthio)propionaldehyde is classified as dangerous. It is harmful if swallowed, causes severe skin burns and eye damage, and toxic if inhaled. Appropriate personal protective equipment, including gloves, eye protection, and respiratory protection, should be used. Handle in a well-ventilated area and store at 2-8°C.
How is 3-(Methylthio)propionaldehyde packed, shipped, and exported?
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Tech Serve Solutions ensures that 3-(Methylthio)propionaldehyde is appropriately packed and handled according to international shipping regulations for hazardous materials. We offer global export services.
How can I request a sample or a quote for 3-(Methylthio)propionaldehyde?
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To request a sample or a quote for 3-(Methylthio)propionaldehyde, please contact our sales department through the TSS website or via direct inquiry, providing your contact details and quantity requirements.
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