2-Butynyl p-toluenesulfonate
2-Butynyl p-toluenesulfonate (CAS: 56563-37-2), with the molecular formula C11H12O3S and a molecular weight of 224.28 g/mol, is a chemical compound utilised in organic synthesis. It serves as a useful building block in the creation of more complex molecules within research and development settings. Its tosylate group makes it a reactive intermediate for various chemical transformations.
- IUPAC
- 2-Butynyl 4-methylbenzenesulfonate

Organic Synthesis Intermediate
Utilised as a versatile building block in the construction of complex organic molecules. The tosylate moiety acts as a good leaving group, facilitating nucleophilic substitution reactions.
Chemical Research and Development
Employed in laboratory settings for exploring novel synthetic pathways and developing new chemical entities. Its structure allows for diverse derivatisation.
Preparation of Specialty Chemicals
Can be used in the synthesis of various specialty chemicals where a butynyl group functionalised with a tosylate is required for subsequent reactions.
| Molecular weight | 224.28 |
|---|---|
| Empirical formula | C11H12O3S |
| Assay | 96% |
| Melting point | 47-51 °C |

Hazard statements
- H315Causes skin irritation
- H319Causes serious eye irritation
- H335May cause respiratory irritation
Precautionary statements
- P261Avoid breathing dust, fume, gas or vapours
- P305IF IN EYES
| Protective equipment | dust mask type N95 (US), Eyeshields, Gloves |
|---|---|
| Flash point | >110 °C / >230 °F |
| Water hazard class (WGK, DE) | 3 |
| Hazard codes (EU) | Xi |
| Risk statements (R) | 36/37/38 |
| Safety statements (S) | 26 |
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-Butynyl p-toluenesulfonate used for?
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2-Butynyl p-toluenesulfonate is primarily used as a building block in organic synthesis and in chemical research and development for creating more complex molecules.
What is the CAS number and formula for 2-Butynyl p-toluenesulfonate?
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The CAS number is 56563-37-2, and the empirical formula (Hill notation) is C11H12O3S.
What grade and purity does Tech Serve Solutions supply?
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Tech Serve Solutions supplies 2-Butynyl p-toluenesulfonate with a minimum assay of 96%. We do not represent this product as USP, BP, or EP grade.
How should 2-Butynyl p-toluenesulfonate be handled safely?
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2-Butynyl p-toluenesulfonate is a Warning substance (GHS07) and causes skin irritation (H315), eye irritation (H319), and respiratory irritation (H335). Handle with care using appropriate personal protective equipment, including a dust mask (type N95 US), eyeshields, and gloves. Ensure adequate ventilation.
Is 2-Butynyl p-toluenesulfonate available for export?
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Yes, Tech Serve Solutions is a global supplier and exporter of fine chemicals, including 2-Butynyl p-toluenesulfonate.
How can I request a sample or quote for 2-Butynyl p-toluenesulfonate?
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Please contact our sales department via our website or directly to request a sample or a quotation for 2-Butynyl p-toluenesulfonate.
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