Description

5-Octadecyne is a high-purity, long-chain terminal alkyne with the CAS registry number 71899-42-8. This compound serves as a versatile and valuable organic building block and intermediate in advanced chemical synthesis. It is primarily utilized by R&D chemists and process development scientists in the pharmaceutical, agrochemical, and material science sectors for constructing complex molecular architectures.

Application

• Pharmaceutical Intermediate: Used in the synthesis of active pharmaceutical ingredients (APIs) and drug candidates via click chemistry (CuAAC) and other alkyne-based coupling reactions.
• Agrochemical Synthesis: Serves as a key precursor for creating novel pesticides, herbicides, and plant growth regulators with tailored hydrophobic properties.
• Material Science & Polymer Chemistry: Acts as a monomer or cross-linking agent for producing specialty polymers, surface coatings, and self-assembled monolayers (SAMs).
• Organic Synthesis & Research: A fundamental reagent for constructing carbon-carbon bonds, used in Sonogashira coupling and other palladium-catalyzed reactions.
• Lubricant & Surfactant Additive: Employed in the development of high-performance lubricant additives and specialty surfactants due to its long hydrocarbon chain.
• Chemical Biology Probes: Utilized in bioconjugation strategies for labeling biomolecules such as proteins and nucleic acids for diagnostic applications.

Basic Information

Product Name	5-Octadecyne
CAS No.	71899-42-8
Molecular Formula	C₁₈H₃₄
Molecular Weight	250.46 g/mol
Synonyms	Octadec-5-yne; 5-Octadecyne; 5-Heptadecyne (common misnomer); 5-C₁₈ Alkyne; Terminal C18 Alkyne; 1-Heptadecyne (isomeric reference); Long-chain terminal alkyne
EINECS	Contact for details

Quality Control

Our 5-Octadecyne is manufactured under strict quality management systems. Each batch undergoes rigorous analytical testing, including GC/HPLC for purity and NMR for structural confirmation, to ensure compliance with exacting R&D and commercial-grade specifications. A comprehensive Certificate of Analysis (COA) detailing purity, identity, and impurity profiles is provided with every shipment to guarantee traceability and batch-to-batch consistency.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, well-ventilated area at room temperature (15-25°C). Keep away from strong oxidizing agents and incompatible materials. For long-term storage, consider an inert atmosphere to maintain optimal purity.

Specification

Item	Specification
Appearance	Colorless to pale yellow liquid
Identification (IR)	Conforms to structure
Purity (GC)	≥ 97.0%
Water Content (KF)	≤ 0.5%

Note: Specifications can be tailored. Please contact us for the detailed technical data sheet of a specific grade.