1-Ethynyl-4-methoxy-2-methylbenzene
1-Ethynyl-4-methoxy-2-methylbenzene (CAS: 74331-69-4) is an organic compound with the molecular formula C10H10O and a molecular weight of 146.19 g/mol. This alkyne derivative, featuring methoxy and methyl substituents on a benzene ring, serves as a valuable building block in organic synthesis. It is employed in research and development for constructing more complex molecular architectures.

Organic Synthesis Intermediate
This compound functions as a key intermediate in the synthesis of diverse organic molecules. Its terminal alkyne functionality allows for various coupling reactions and functional group transformations.
Research and Development
Utilised in academic and industrial research laboratories for the exploration of novel chemical pathways and the development of new materials or pharmaceutical candidates.
Building Block for Heterocycles
The structure of 1-Ethynyl-4-methoxy-2-methylbenzene makes it suitable for the construction of various heterocyclic compounds through cyclisation reactions.
| Molecular weight | 146.19 |
|---|---|
| Linear formula | CH3OC6H3(CH3)C≡CH |
| Assay | 97% |
| Melting point | 30-34 °C(lit.) |

Hazard statements
- H317May cause an allergic skin reaction
- H319Causes serious eye irritation
Precautionary statements
- P280Wear protective gloves, clothing and eye/face protection
- P305IF IN EYES
| Protective equipment | dust mask type N95 (US), Eyeshields, Faceshields, Gloves |
|---|---|
| Flash point | 93 °C / 199.4 °F |
| Water hazard class (WGK, DE) | 3 |
| Hazard codes (EU) | Xi |
| Risk statements (R) | 36-43 |
| Safety statements (S) | 26-36/37 |
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 1-Ethynyl-4-methoxy-2-methylbenzene used for?
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1-Ethynyl-4-methoxy-2-methylbenzene is primarily used as a building block and intermediate in organic synthesis and research and development activities.
What is the CAS number and formula for 1-Ethynyl-4-methoxy-2-methylbenzene?
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The CAS number is 74331-69-4 and the molecular formula is C10H10O.
What grade and purity does Tech Serve Solutions supply?
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Tech Serve Solutions supplies 1-Ethynyl-4-methoxy-2-methylbenzene with a minimum assay of 97%. This product is suitable for research and technical applications. Tech Serve Solutions does not represent this product as USP, BP, or EP grade.
What are the primary safety concerns when handling this chemical?
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This compound is classified with GHS07 signal word 'Warning', with hazard statements H317 (May cause an allergic skin reaction) and H319 (Causes serious eye irritation). Appropriate personal protective equipment, including a dust mask type N95, eyeshields, face shields, and gloves, should be worn.
How is 1-Ethynyl-4-methoxy-2-methylbenzene typically packed and shipped?
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1-Ethynyl-4-methoxy-2-methylbenzene is carefully packed in compliance with international shipping regulations. TSS is a global supplier and exporter of fine chemicals.
How can I request a quote or sample?
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To request a quote or a sample, please contact the Tech Serve Solutions sales team through our website or by phone, referencing the product name and CAS number.
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