3-Ethyl-3-[[(2-ethylhexyl)oxy]methyl]oxetane TCI E1566

Chemical Identity

Other names: OXT 212 · 2-Ethylhexyl (3-Ethyl-3-oxetanylmethyl) Ether
CAS No.: 298695-60-0
Formula: C14H28O2
Molecular weight: 228.38 g/mol
Purity: >95.0%(GC)

Full identifiers (IUPAC, SMILES, InChIKey)

IUPAC: 3-ethyl-3-(2-ethylhexoxymethyl)oxetane
SMILES: CCCCC(CC)COCC1(COC1)CC
InChIKey: BIDWUUDRRVHZLQ-UHFFFAOYSA-N
MDL: MDL17214769
PubChem: CID 21867834

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3-Ethyl-3-[[(2-ethylhexyl)oxy]methyl]oxetane, supplied by TCI under catalogue code E1566, is an oxetane monomer carrying a 2-ethylhexyl ether side chain. The oxetane unit is a four-membered cyclic ether that holds a considerable degree of ring strain, which makes it open readily under cationic polymerisation conditions. Because of this behaviour, oxetane compounds are widely used as monomers or reactive diluents in cationic curing systems initiated by ultraviolet light. Within the heterocyclic building block group, this material also serves as a starting framework for the synthesis of oxetane-containing molecules, a class that has attracted growing interest in organic chemistry.

The property that makes this monomer a preferred choice is its balance between reactivity and viscosity. The oxetane ring reacts in a more controlled manner than epoxides in several systems, while the long, branched 2-ethylhexyl chain lowers the viscosity of the formulation and at the same time improves the flexibility and hydrophobic character of the film that is formed. The branched structure also helps prevent crystallisation, so the material remains a liquid that is easy to blend into a formulation. In UV-curing formulations, oxetane monomers are frequently combined with cycloaliphatic epoxide resins.

In Indonesian laboratories, this material is typically handled in research and development work on coatings, inks and adhesives, as well as in synthetic organic chemistry groups building oxetane-containing structures. It is usually drawn in small volumes for formulation trials, cure studies and comparative screening against epoxide-based systems. University and industrial laboratories alike use it where a reactive diluent is needed that keeps a mixture workable without compromising the properties of the cured layer.

Cationic UV-curing formulation development: the strained oxetane ring opens readily under photoinitiated cationic conditions, making the monomer a direct participant in the curing network rather than an inert additive.
Reactive diluent in coating systems: the branched 2-ethylhexyl chain lowers formulation viscosity so that mixtures remain workable, while the oxetane group still reacts into the final cured film.
Co-monomer with cycloaliphatic epoxide resins: oxetane monomers are commonly paired with these resins, allowing formulators to tune the overall reactivity and handling of a cationic system.
Synthesis of oxetane-containing molecules: as a heterocyclic building block, it provides a ready oxetane framework for organic chemists working on this increasingly studied structural class.
Flexibility and hydrophobicity studies in cured films: the long branched side chain contributes both flexibility and hydrophobic character, making the monomer useful for comparative film property work.

Brand	TCI, catalogue number E1566
CAS number	298695-60-0
Molecular formula	—
Purity	—
Category	Chemistry > Building Blocks > Heterocyclic Building Blocks
Pack sizes	available in standard TCI research packaging; please confirm the pack size required when ordering
Physical form	liquid, the branched structure helping to prevent crystallisation
Storage	keep in a cool place, closed tightly, and away from light and ignition sources

Store the container tightly closed in a cool, well-ventilated area, protected from direct light and away from heat, sparks and open flames. Keep the material in its original supplier packaging or in a compatible, clearly labelled closed container, and avoid contact with acids or strong Lewis acid species, since these can initiate cationic ring opening of the oxetane. Handle in a fume hood using gloves, safety glasses and a laboratory coat, transfer with clean dry glassware or syringes, and close the container promptly after use to limit exposure to air and moisture. Consult the manufacturer's safety data sheet before first use and follow institutional chemical waste procedures for disposal.

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