2-Butanethiol
2-Butanethiol (CAS: 513-53-1), with the molecular formula CH3CH2CH(SH)CH3 and a molar mass of 90.19 g/mol, is a volatile organosulfur compound. It belongs to the alkyl thiol family and is characterised by its strong, pungent odour. This chemical serves as a valuable building block in organic synthesis, finding applications in materials science and micro/nanoelectronics due to its unique chemical properties.
- IUPAC
- sec-Butyl mercaptan,Mercaptan C4
- Synonyms
- sec-Butyl mercaptanMercaptan C4

Organic Synthesis
2-Butanethiol is employed as a key intermediate and building block in the synthesis of various organic compounds. Its thiol group allows for diverse chemical transformations, making it useful for creating more complex molecules.
Materials Science
This compound can be utilised in the development of novel materials. Its incorporation into polymers or surfaces can impart specific properties, such as altered surface energy or chemical reactivity, relevant to advanced material applications.
Micro/Nanoelectronics
2-Butanethiol has potential applications in micro and nanoelectronics, particularly in areas like self-assembly and surface functionalisation for creating patterned surfaces or modifying electronic components.
Self-Assembly
As a thiol, it can participate in self-assembly processes, forming ordered monolayers on surfaces like gold. This property is crucial for applications in nanotechnology and surface patterning.
| Molecular weight | 90.19 |
|---|---|
| Linear formula | CH3CH2CH(SH)CH3 |
| Assay | 98% |
| Boiling point | 84.6-85.2 °C(lit.) |
| Density | 0.83 g/mL at 25 °C(lit.) |
| Refractive index | n20/D 1.436(lit.) |
| Vapour pressure | 142 mmHg (37.7 °C) |


Hazard statements
- H225Highly flammable liquid and vapour
- H315Causes skin irritation
- H319Causes serious eye irritation
- H335May cause respiratory irritation
Precautionary statements
- P210Keep away from heat, sparks and open flames. No smoking
- P261Avoid breathing dust, fume, gas or vapours
- P305IF IN EYES
| Protective equipment | Eyeshields, Faceshields, full-face respirator (US), Gloves, multi-purpose combination respirator cartridge (US), type ABEK (EN14387) respirator filter |
|---|---|
| Flash point | -23 °C / -9.4 °F |
| Transport (UN / ADR) | UN 2347 3 / PGII |
| Water hazard class (WGK, DE) | 3 |
| Hazard codes (EU) | F,Xi |
| Risk statements (R) | 11-36/37/38 |
| Safety statements (S) | 16-26-36 |
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 2-Butanethiol used for?
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2-Butanethiol is primarily used as a building block in organic synthesis, for applications in materials science, micro/nanoelectronics, and self-assembly processes.
What is the CAS number and formula for 2-Butanethiol?
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The CAS number for 2-Butanethiol is 513-53-1, and its molecular formula is CH3CH2CH(SH)CH3.
What grade and purity does Tech Serve Solutions supply?
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Tech Serve Solutions supplies 2-Butanethiol at an assay of 98%. We do not represent this product as USP, BP, EP, or any other pharmacopoeia grade.
What are the safety and handling considerations for 2-Butanethiol?
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2-Butanethiol is a Dangerously flammable liquid and vapour (H225). It causes skin irritation (H315), serious eye irritation (H319), and may cause respiratory irritation (H335). Appropriate personal protective equipment, including eyeshields, gloves, and suitable respiratory protection, must be used. It should be handled in a well-ventilated area away from ignition sources.
How is 2-Butanethiol packed, shipped, and exported?
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2-Butanethiol is packed and shipped according to international regulations for hazardous materials, including UN 2347, Class 3, Packing Group II. Tech Serve Solutions is experienced in global export.
How can I request a sample or quote for 2-Butanethiol?
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To request a sample or a quote for 2-Butanethiol, please contact our sales team through the website or by phone, specifying your requirements.
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