2-Cyclopenten-1-one
2-Cyclopenten-1-one (CAS: 930-30-3, C5H6O) is a reactive cyclic ketone with a molecular weight of 82.10 g/mol. This versatile building block serves as an electrophile in various organic synthesis reactions. Its applications are primarily focused on chemical synthesis, enabling the construction of complex molecules through reactions like conjugate additions and cycloadditions. TSS supplies this compound at 98% purity for research and development purposes.

Electrophilic Reagent in Organic Synthesis
2-Cyclopenten-1-one acts as a versatile electrophile, readily participating in conjugate addition reactions with organocopper nucleophiles and Michael additions with silyl enol ethers.
Diels-Alder Cycloadditions
This compound can function as a dienophile in Diels-Alder reactions, facilitating the formation of cyclic adducts and contributing to the synthesis of complex ring systems.
Phosphoniosilylation Reactions
2-Cyclopenten-1-one is employed in phosphoniosilylation reactions, a synthetic methodology used for introducing silicon and phosphorus functionalities into organic molecules.
| Molecular weight | 82.10 |
|---|---|
| Empirical formula | C5H6O |
| Assay | 98% |
| Boiling point | 64-65 °C/19 mmHg(lit.) |
| Density | 0.98 g/mL at 25 °C(lit.) |
| Refractive index | n20/D 1.481(lit.) |
| Storage temperature | 2-8°C |
| Application | Versatile electrophile employed in a variety of addition reactions including conjugate addition of organocopper nucleophiles,1 Michael reaction with silyl enol ethers,2 and siloxanes,3 Diels-Alder cycloadditions,4 and phosphoniosilylations.5 |

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 1224C 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 2-Cyclopenten-1-one used for?
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2-Cyclopenten-1-one is primarily used as a versatile electrophile in organic synthesis for reactions such as conjugate addition, Michael reactions, Diels-Alder cycloadditions, and phosphoniosilylations.
What is the CAS number and formula for 2-Cyclopenten-1-one?
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The CAS number for 2-Cyclopenten-1-one is 930-30-3, and its empirical formula is C5H6O.
What grade and purity does Tech Serve Solutions supply?
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Tech Serve Solutions supplies 2-Cyclopenten-1-one with an assay of 98%. This product is intended for research and laboratory use.
How should 2-Cyclopenten-1-one be handled safely?
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2-Cyclopenten-1-one is a flammable liquid and vapour (H226). Handle with appropriate personal protective equipment, including eyeshields, gloves, and respiratory protection, in a well-ventilated area. Store at 2-8°C.
Is 2-Cyclopenten-1-one available for export and how is it shipped?
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Yes, Tech Serve Solutions is a global supplier and exporter of fine chemicals. 2-Cyclopenten-1-one is shipped according to international regulations for hazardous materials, UN 1224C, Class 3, PGIII.
How can I request a quote or sample for 2-Cyclopenten-1-one?
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To request a quote or sample, please contact our sales team through the website or by calling us directly. Please specify the quantity required and your delivery location.
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