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Description
4-Ethynylbenzonitrile is a bifunctional aromatic building block that carries a terminal ethynyl group on one side of the benzene ring and a nitrile group at the opposite para position. Bringing together two functional groups of very different character within a single linear molecule makes this compound highly useful across organic synthesis, materials chemistry, and coordination chemistry. The terminal alkyne serves as a reaction partner in a wide range of modern cross-coupling transformations, while the nitrile acts both as an electron-withdrawing group and as a precursor to amines, amides, carboxylic acids, or tetrazole rings.
The properties that make this compound a preferred choice are its rigid linear geometry together with the highly dependable reactivity of the terminal alkyne. The carbon–carbon triple bond bearing a terminal hydrogen atom is ready to undergo Sonogashira coupling with aryl halides, as well as copper-catalysed azide–alkyne cycloaddition, widely known as the click reaction. This click chemistry proceeds in high yield, tolerates a broad range of functional groups, and runs under mild conditions, which makes it well suited to attaching labels onto biomolecules. The strongly electron-withdrawing nitrile group increases the polarisation of the molecule, adding a further handle for tuning electronic behaviour.
In Indonesian laboratories this building block is typically used in university and institutional research groups working on organic synthesis, in materials chemistry programmes constructing conjugated or coordination frameworks, and in bioconjugation work where click chemistry is used to attach reporter groups. It is normally purchased in small research quantities for method development and multi-step synthesis rather than for routine analytical testing, and it is handled in laboratories equipped with a fume hood and standard inert-atmosphere technique.
Laboratory Applications
- Sonogashira cross-coupling: the terminal alkyne couples reliably with aryl and heteroaryl halides under palladium–copper catalysis, giving rapid access to extended conjugated aryl-alkyne scaffolds.
- Copper-catalysed azide–alkyne click chemistry: the terminal ethynyl group reacts in high yield under mild conditions, making it a dependable partner for triazole formation in modular synthesis.
- Bioconjugation and molecular labelling: broad functional-group tolerance of the click reaction allows reporter groups and tags to be attached to biomolecules without disturbing sensitive functionality.
- Materials and coordination chemistry: the rigid linear para-substituted geometry, combined with the nitrile donor site, suits the construction of conjugated materials and coordination frameworks.
- Nitrile-based functional group interconversion: the cyano group serves as a versatile precursor that can be converted into amines, amides, carboxylic acids, or tetrazole rings in multi-step routes.
Specifications
- Brand: TCI
- Catalogue reference: E0872
- CAS number: 3032-92-6
- Category: Chemistry > Building Blocks > Non-Heterocyclic Building Blocks
- Pack sizes: available in research-scale packs; please confirm the currently offered sizes when ordering.
- Storage: keep in a cool, dry, well-ventilated place in a tightly closed original container, away from light and heat.
Handling and Storage
Store the material in its original tightly closed container in a cool, dry, well-ventilated area, protected from direct sunlight, heat, and ignition sources, and keep it away from strong oxidising agents and other incompatible chemicals. Amber glass or the manufacturer's supplied container is appropriate; for moisture- or air-sensitive handling, transfer under an inert atmosphere. Handle the compound inside a fume hood, wearing safety goggles, chemically resistant gloves, and a laboratory coat, and avoid inhalation of dust or vapour and contact with skin and eyes. Weigh and transfer carefully to prevent spillage, keep containers clearly labelled and sealed after each use, and consult the manufacturer's safety data sheet for the full hazard, first-aid, and disposal guidance before beginning work.
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