Cyclooctatetraene
Cyclooctatetraene (CAS: 629-20-9), a cyclic organic compound with the formula C8H8 and a molecular weight of 104.15 g/mol, is a key building block in organic synthesis. This non-aromatic cyclic polyene exhibits unique reactivity due to its conjugated double bond system. It is primarily employed in research and development for the synthesis of novel organic molecules and complex structures, serving as a versatile intermediate in chemical transformations.

Organic Synthesis Intermediate
Cyclooctatetraene is widely utilised as a precursor in the synthesis of various organic compounds. Its conjugated pi system allows for diverse reactions, including cycloadditions and polymerisations, making it valuable for creating complex molecular architectures.
Research and Development
In academic and industrial research settings, cyclooctatetraene serves as a model compound for studying the chemistry of non-aromatic cyclic systems. It is employed to explore novel reaction pathways and develop new synthetic methodologies.
Materials Science
This compound can be a building block for novel polymers and materials. Its unique structure and reactivity offer potential for developing materials with specific electronic or physical properties.
| Molecular weight | 104.15 |
|---|---|
| Empirical formula | C8H8 |
| Assay | 98% |
| Boiling point | 142-143 °C(lit.) |
| Density | 0.925 g/mL at 25 °C(lit.) |
| Refractive index | n20/D 1.537(lit.) |
| Storage temperature | −20°C |
| Melting point | −5-−3 °C(lit.) |
| Contains / stabiliser | 0.1% hydroquinone as inhibitor |



Hazard statements
- H225Highly flammable liquid and vapour
- H304May be fatal if swallowed and enters airways
- 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
- P301IF SWALLOWED
- P305IF IN EYES
- P331Do NOT induce vomiting
| Protective equipment | Eyeshields, Faceshields, full-face respirator (US), Gloves, multi-purpose combination respirator cartridge (US), type ABEK (EN14387) respirator filter |
|---|---|
| Flash point | 22 °C / 71.6 °F |
| Transport (UN / ADR) | UN 2358 3 / PGII |
| Water hazard class (WGK, DE) | 3 |
| Hazard codes (EU) | Xn |
| Risk statements (R) | 10-36/37/38-65 |
| Safety statements (S) | 26-62 |
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 Cyclooctatetraene (CAS: 629-20-9) used for?
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Cyclooctatetraene is primarily used as a versatile building block in organic synthesis and in research and development for creating complex organic molecules and studying non-aromatic cyclic systems.
What is the CAS number and chemical formula for Cyclooctatetraene?
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The CAS number for Cyclooctatetraene is 629-20-9, and its chemical formula is C8H8.
What grade and purity does Tech Serve Solutions supply for Cyclooctatetraene?
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Tech Serve Solutions supplies Cyclooctatetraene with an assay of 98%. This is a technical or research grade material, and TSS does not represent it as USP, BP, EP, or any other pharmacopoeia grade.
What are the safety considerations for handling Cyclooctatetraene?
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Cyclooctatetraene is a highly flammable liquid and vapour (H225), may be fatal if swallowed or enters airways (H304), and causes skin irritation (H315), serious eye irritation (H319), and respiratory irritation (H335). Always use appropriate personal protective equipment, including eyeshields, gloves, and a suitable respirator, and handle in a well-ventilated area away from ignition sources.
How is Cyclooctatetraene packed and shipped by TSS?
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Cyclooctatetraene is packed according to transport regulations, identified as UN 2358, Class 3, Packing Group II. Tech Serve Solutions exports chemicals globally, adhering to international shipping standards.
How can I request a sample or quote for Cyclooctatetraene?
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To request a sample or a quote for Cyclooctatetraene, please contact our sales team through the website or via email, providing your contact details and required quantity.
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