Chemical Identity and Physical Properties

3,4-Epoxytetrahydrofuran (SKU: E616368) is a bicyclic heterocyclic compound in which an epoxide (oxirane) ring is fused directly to a tetrahydrofuran (THF) ring. Its molecular formula is C₄H₆O₂, giving a molecular weight of approximately 86.09 g/mol. The compound belongs to the class of strained bicyclic epoxides, where the ring fusion imposes significant angle strain on the epoxide, greatly enhancing its reactivity toward nucleophiles compared with monocyclic epoxides.

At room temperature, 3,4-Epoxytetrahydrofuran is typically a colorless to pale-yellow liquid with a low boiling point consistent with its small molecular size. Its miscibility with common polar aprotic solvents such as THF, DMF, and acetonitrile makes it straightforward to incorporate into standard reaction setups. The oxygen-rich bicyclic framework also contributes to moderate water solubility, though contact with water or protic media should be avoided during storage to prevent hydrolytic ring opening.

Note: Specific boiling point, melting point, density, and refractive index values should be confirmed against the certificate of analysis (CoA) supplied with each lot of E616368, as these can vary slightly with purity.

Synthesis and Reactivity

3,4-Epoxytetrahydrofuran is most commonly prepared by the epoxidation of 2,3-dihydrofuran or related unsaturated cyclic ethers using peracid reagents (e.g., m-CPBA) or other electrophilic oxygen-transfer agents. The ring-fusion geometry fixes the epoxide in a cis-configuration relative to the THF ring, which has important stereochemical consequences for downstream reactions.

The defining reactivity of 3,4-Epoxytetrahydrofuran is nucleophilic ring opening of the strained epoxide. A wide range of nucleophiles—including amines, thiols, alcohols, azides, and organometallic reagents—can open the epoxide regioselectively, typically at the less hindered carbon, to give functionalized THF-containing products bearing a new stereocentre. This makes the compound especially valuable in:

• Natural product synthesis: as a chiral equivalent for introducing oxygen-rich ring systems found in bioactive terpenoids and polyketides.
• Medicinal chemistry: for constructing bicyclic or spirocyclic scaffolds with drug-like three-dimensional character.
• Polymer chemistry: as a latent difunctional monomer capable of cationic or anionic ring-opening polymerization.

Lewis acid catalysis (e.g., BF₃·Et₂O, SnCl₄) or Brønsted acid activation can further modulate regioselectivity and diastereoselectivity in ring-opening reactions.

Safe Handling, Storage, and Disposal

Hazard overview: Like all strained epoxides, 3,4-Epoxytetrahydrofuran is a reactive electrophile capable of alkylating biological macromolecules. It should be treated as a potential skin and mucous-membrane irritant and a possible sensitizer. Always consult the Safety Data Sheet (SDS) for E616368 before use.

Personal protective equipment (PPE): Wear chemically resistant gloves (nitrile or neoprene), safety goggles, and a lab coat. Work in a well-ventilated fume hood whenever the compound is open to the atmosphere.

Storage:

• Store under an inert atmosphere (nitrogen or argon) in a tightly sealed vial.
• Keep at 2–8 °C (refrigerator) away from light, moisture, and incompatible materials such as strong acids, strong bases, and reducing agents.
• Do not store near nucleophilic reagents that could trigger premature ring opening.

Disposal: Dispose of waste containing 3,4-Epoxytetrahydrofuran in accordance with local, national, and institutional regulations for halogen-free organic solvent waste. Quench small quantities by careful treatment with dilute aqueous base or by ring-opening with a sacrificial nucleophile before disposal. Never pour down the drain untreated.

Recommended Laboratory Protocol for Epoxide Ring-Opening Reactions

The following general protocol outlines best practices for nucleophilic ring-opening of 3,4-Epoxytetrahydrofuran under mild conditions. Researchers should optimize stoichiometry, solvent, temperature, and catalyst for their specific target molecule.

1. Glassware preparation: Oven-dry all glassware at 120 °C overnight. Cool under vacuum and back-fill with nitrogen or argon.
2. Substrate preparation: Transfer 3,4-Epoxytetrahydrofuran (E616368) via syringe or cannula under inert gas. Weigh in a glove bag if your balance is not in a fume hood.
3. Nucleophile addition: Dissolve the nucleophile (1.0–1.5 equiv) in anhydrous THF or DMF. Add dropwise to a stirred solution of the epoxide at 0 °C, then allow to warm to room temperature or heat gently as required.
4. Catalyst (optional): For Lewis acid catalysis, add BF₃·Et₂O (0.1–1.0 equiv) to the epoxide solution at −78 °C before nucleophile addition. For base-mediated opening, use Cs₂CO₃ or K₂CO₃ in DMF.
5. Reaction monitoring: Monitor conversion by TLC or LC-MS. Typical reactions reach completion within 1–12 hours depending on nucleophile reactivity.
6. Workup: Quench with saturated aqueous NH₄Cl, extract with ethyl acetate, wash with brine, dry over Na₂SO₄, filter, and concentrate under reduced pressure.
7. Purification: Purify the crude product by flash column chromatography on silica gel (eluent system to be optimized per substrate).

All specific yields, ratios, and conditions cited in the primary literature should be validated in your own laboratory before scale-up.