1-Iodooctadecane TCI I0065

TCI I0065 1-Iodooctadecane is a very long-chain haloalkane built on an eighteen-carbon backbone, also known as stearyl iodide. As a non-heterocyclic building block, it serves as a primary means of attaching a long hydrocarbon chain to a target molecule — a step that fundamentally alters the solubility, melting behaviour, and interfacial character of the resulting compound. Synthetic chemists reach for this reagent when a molecule needs a large, well-ordered hydrophobic tail rather than a short alkyl substituent, making it a recurring entry in the building-block inventory of laboratories engaged in materials and organic synthesis work.

The property that drives its selection is the performance of iodide as a leaving group. Long-chain alkylation proceeds at a workable rate even though the molecule is bulky and frequently runs into solubility limitations, whereas long-chain alkyl bromides often demand elevated temperatures and extended reaction times to reach comparable conversion. The iodide version completes the reaction under milder and cleaner conditions, which reduces thermal stress on sensitive substrates and simplifies purification. This combination of reliable reactivity and a defined eighteen-carbon chain is what distinguishes it from shorter or less reactive alkylating agents in the same family.

Long-chain compounds of this type are generally soft solids at room temperature that melt readily on gentle warming, so transfers are commonly carried out while the material is warm to allow accurate handling and complete delivery from the container. In Indonesian laboratories, where ambient conditions vary between air-conditioned and non-conditioned workspaces, this behaviour is worth anticipating when planning a weighing or dispensing step, and it also shapes how the reagent is prepared for routine synthetic use.

• Surfactant synthesis — the eighteen-carbon chain supplies the bulky hydrophobic tail required for amphiphile design, while the iodide leaving group allows the alkylation onto a polar head group to proceed under mild conditions.
• Synthetic lipid preparation — provides a defined, uniform long-chain segment for building lipid mimetics, giving reproducible chain length that is essential when interfacial and self-assembly behaviour must be controlled.
• Liquid crystal materials research — long, regular alkyl chains govern mesophase formation, and this reagent installs that chain cleanly without the prolonged heating that long-chain bromides typically require.
• Surface modifier preparation — used to introduce extended hydrocarbon tails onto substrates and molecules whose surface energy, wettability, or interfacial behaviour must be deliberately altered for a given application.
• General long-chain alkylation in organic synthesis — the superior iodide leaving group keeps conversion acceptable despite the molecule's size and solubility constraints, shortening reaction times relative to alternative halides.

• Chemical name: 1-Iodooctadecane (stearyl iodide)

Store the container tightly closed in a cool, dark place, as alkyl iodides are generally sensitive to light and are best protected from prolonged exposure. Amber glass or the original supplier packaging is the appropriate container; keep the closure secure to limit contact with air and moisture. Because the material is a soft solid that melts on warming, transfers are often performed with gentle warming to obtain an accurate and complete transfer — allow the container to return to storage temperature afterwards. Handle in a fume hood using gloves, safety glasses, and a laboratory coat, and follow the manufacturer's safety data sheet for full handling, spill, and disposal guidance.

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