1,2,3,4-Tetramethyl-1,3-cyclopentadiene
1,2,3,4-Tetramethyl-1,3-cyclopentadiene (CAS 4249-10-9) is a cyclic alkene with the molecular formula C9H14 and a molecular weight of 122.21 g/mol. This organic compound serves as a valuable building block in chemical synthesis. Its structure lends itself to various organic reactions, making it a useful intermediate for researchers and chemists.
- Synonyms
- 4-Tetramethyl-1,3-cyclopentadiene4249-10-9C9H14

Organic Synthesis Intermediate
Utilised as a precursor in the synthesis of more complex organic molecules. Its reactive diene system allows for participation in various cycloaddition reactions.
Research and Development
Employed in academic and industrial research laboratories for the exploration of new synthetic pathways and the development of novel compounds.
Specialty Chemical Production
Serves as a building block for the manufacture of specialty chemicals where a tetramethylcyclopentadiene moiety is required.
| Molecular weight | 122.21 |
|---|---|
| Empirical formula | C9H14 |
| Assay | ~85% |
| Boiling point | 142 °C(lit.) |
| Density | 0.808 g/mL at 25 °C(lit.) |
| Refractive index | n20/D 1.472(lit.) |

Hazard statements
- H226Flammable liquid and vapour
| Protective equipment | Eyeshields, Faceshields, full-face respirator (US), Gloves, multi-purpose combination respirator cartridge (US), type ABEK (EN14387) respirator filter |
|---|---|
| Flash point | 42 °C / 107.6 °F |
| Transport (UN / ADR) | UN 3295C 3 / PGIII |
| Water hazard class (WGK, DE) | 3 |
| Risk statements (R) | 10 |
| Safety statements (S) | 16 |
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 1,2,3,4-Tetramethyl-1,3-cyclopentadiene used for?
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1,2,3,4-Tetramethyl-1,3-cyclopentadiene is primarily used as an intermediate in organic synthesis and in research and development for creating new compounds.
What is the CAS number and formula for 1,2,3,4-Tetramethyl-1,3-cyclopentadiene?
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The CAS number is 4249-10-9 and the empirical formula is C9H14.
What grade and purity does Tech Serve Solutions supply?
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Tech Serve Solutions supplies 1,2,3,4-Tetramethyl-1,3-cyclopentadiene with an assay of approximately 85%. We do not represent this product as USP, BP, or EP grade.
How should 1,2,3,4-Tetramethyl-1,3-cyclopentadiene be handled?
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This compound is flammable (flash point 42 °C) and requires handling with appropriate personal protective equipment, including eyeshields, gloves, and respiratory protection, in a well-ventilated area.
Is 1,2,3,4-Tetramethyl-1,3-cyclopentadiene regulated?
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Based on the provided data, 1,2,3,4-Tetramethyl-1,3-cyclopentadiene is classified under UN 3295C, indicating it is regulated for transport as a flammable liquid.
How is 1,2,3,4-Tetramethyl-1,3-cyclopentadiene packed and exported?
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1,2,3,4-Tetramethyl-1,3-cyclopentadiene is carefully packed and exported by Tech Serve Solutions in compliance with international shipping regulations for hazardous materials.
How can I request a quote or sample?
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To request a quote or sample of 1,2,3,4-Tetramethyl-1,3-cyclopentadiene, please contact our sales team through the TSS website or your designated representative.
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