Ethynylcyclopropane

Ethynylcyclopropane is an organic compound with the molecular formula C5H6 and CAS number 6746-94-7. It features a cyclopropane ring attached to an ethynyl group (triple bond), making it a highly strained cyclic alkyne. With a molecular weight of 66.1 g/mol, this compound is classified as a flammable liquid with irritant properties and requires careful handling due to its hazardous nature.

Ethynylcyclopropane is a flammable liquid at room temperature due to its classification as Flam. Liq. 2. The compound contains both a three-membered ring and a triple bond, contributing to its high reactivity and instability. Its low molecular weight of 66.1 g/mol suggests high volatility. The presence of the strained cyclopropane ring combined with the ethynyl group makes it particularly reactive and potentially unstable under certain conditions.

Ethynylcyclopropane is primarily used as a specialized reagent in organic synthesis and research applications. Its unique structure, combining a strained cyclopropane ring with an alkyne functionality, makes it valuable for studying ring-opening reactions and cycloaddition processes. It serves as a building block in pharmaceutical intermediates and fine chemical synthesis, particularly where the introduction of both cyclopropyl and ethynyl functionalities is required in molecular structures.

Ethynylcyclopropane requires careful handling due to its flammable and irritant properties. Always wear appropriate PPE including safety goggles, chemical-resistant gloves, and protective clothing. Work in well-ventilated areas or under fume hoods to prevent vapor accumulation. Eliminate all ignition sources as it poses fire hazards. Avoid skin and eye contact due to its irritant classification. Use proper grounding procedures when transferring to prevent static discharge.

Ethynylcyclopropane must be stored in a cool, dry, well-ventilated area away from heat sources, sparks, and open flames. Keep containers tightly sealed and use appropriate flammable liquid storage cabinets. Store away from oxidizing agents and incompatible materials. Maintain storage temperatures below recommended limits and ensure proper labeling with GHS02 and GHS05 pictograms. Regular inspection of containers for leaks or damage is essential due to its volatile nature.

In case of skin contact with ethynylcyclopropane, immediately remove contaminated clothing and wash the affected area thoroughly with soap and water for at least 15 minutes. For eye contact, flush immediately with clean water for at least 15 minutes and seek medical attention promptly due to its Eye Dam. 1 classification. If inhaled, move to fresh air immediately. Remove from exposure source and seek medical attention if symptoms persist or worsen.

Ethynylcyclopropane disposal must comply with local and national hazardous waste regulations. It cannot be disposed of in regular waste streams due to its flammable and irritant properties. Contact licensed hazardous waste disposal companies for proper treatment and disposal. Small quantities may be incinerated in approved facilities with appropriate emission controls. Always consult local environmental authorities for specific disposal requirements and maintain proper documentation of waste disposal activities.

Ethynylcyclopropane is classified under ADR Class 3 (flammable liquids), Packing Group II, indicating moderate danger during transport. Shipments must use UN-approved packaging and proper labeling with hazard diamonds. Transport vehicles require appropriate placarding and documentation. Drivers must hold ADR certification for dangerous goods transport. Ensure proper segregation from incompatible materials and follow specific loading and unloading procedures for flammable liquids during transportation.

Ethynylcyclopropane is subject to CLP regulation classification as Flam. Liq. 2, Skin Irrit. 2, Eye Dam. 1, and Aquatic Chronic 3, requiring appropriate labeling and safety data sheets. It falls under REACH regulation for chemical registration and evaluation in the EU. While not classified as SVHC, it requires compliance with occupational exposure limits and worker protection measures. Transport is regulated under ADR/RID for dangerous goods movement across Europe.

Ethynylcyclopropane is available through OYSI, a specialized European distributor of technical chemicals and laboratory reagents. As a professional chemical supplier, OYSI ensures proper handling, packaging, and documentation compliance with European regulations including REACH and CLP requirements. Contact OYSI directly for availability, technical specifications, and pricing information. All shipments include proper hazard labeling and safety documentation required for this flammable and irritant substance.