(+)-Limonene is a chiral cyclic monoterpene, widely known as the principal component of citrus peel oil and the source of the fresh citrus aroma associated with it. In reagent catalogues, this material is classified as a chiral building block because it is supplied as a single enantiomer with the dextrorotatory configuration. The molecule carries two double bonds — one located within the cyclohexene ring and one on the isopropenyl group — together with a single stereogenic centre. That structure makes it an inexpensive, renewable, and highly useful starting point for asymmetric synthesis and for terpenoid transformations in the organic chemistry laboratory.
The properties that make (+)-Limonene a frequent choice are its defined optical purity combined with the dual reactivity of its two double bonds. The two alkenes differ in their degree of substitution, so reactions such as epoxidation, hydroboration, or hydrogenation can be directed selectively toward one of them. As a non-polar hydrocarbon that is liquid at room temperature, the compound also serves as a green solvent alternative to chlorinated solvents and aromatic hydrocarbons. On the other hand, its terpene character makes it sensitive to oxidation by air and light, so storage conditions deserve attention.
In Indonesian laboratories, (+)-Limonene is commonly encountered in university and institutional organic synthesis groups working on natural product chemistry and stereoselective methodology, where a renewable chiral starting material is preferred over a petroleum-derived one. It is also drawn on in laboratories exploring greener solvent systems, and in analytical work where a well-defined single-enantiomer terpene is required as a reference material. Its liquid form makes routine dispensing straightforward on the open bench.
- Asymmetric synthesis starting material: the defined dextrorotatory configuration and single stereogenic centre allow existing chirality to be carried forward into more complex targets without a resolution step.
- Selective alkene functionalisation studies: the differing substitution levels of the ring and isopropenyl double bonds let epoxidation, hydroboration, or hydrogenation be directed toward one alkene at a time.
- Terpenoid transformation chemistry: as a readily available natural monoterpene skeleton, it serves as a practical substrate for rearrangement, oxidation, and ring-modification work on terpene frameworks.
- Green solvent applications: being a non-polar hydrocarbon liquid at room temperature, it substitutes for chlorinated solvents and aromatic hydrocarbons in extraction, cleaning, and dissolution tasks.
- Reference and teaching material in chiral chemistry: its single-enantiomer form and familiar citrus origin make it a clear demonstration compound for optical activity and stereochemistry practicals.
| Brand | TCI |
|---|---|
| CAS number | 5989-27-5 |
| Molecular formula | — |
| Purity | — |
| Category | Chemistry > Asymmetric Synthesis > Chiral Building Blocks |
| Pack sizes | available in the standard catalogue pack sizes offered for this TCI item; please refer to the product listing for the sizes currently catalogued. |
| Physical form | liquid at room temperature; non-polar hydrocarbon |
| Storage | sensitive to oxidation by air and light, so protective storage conditions are required |
Because (+)-Limonene is a terpene that is sensitive to oxidation by air and light, it should be kept in a tightly closed container that limits contact with air, protected from light, and stored in a cool place away from heat sources and direct sunlight. Amber glass bottles or the original supplier container are suitable, and headspace should be minimised in partially used bottles. Handle the liquid in a fume hood or a well-ventilated area, keep it away from ignition sources as a non-polar hydrocarbon, and use standard laboratory personal protective equipment including gloves, safety glasses, and a laboratory coat. Dispense with clean, dry glassware to avoid introducing contaminants.
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