Description

Cyclopentene, 1-Ethynyl-5-(2-Propynylidene)- (9Ci) is a specialized, high-value chemical building block characterized by its unique diyne-substituted cyclopentene core structure. This compound matters for its role as a versatile intermediate in advanced organic synthesis, particularly in the construction of complex molecular architectures and functional materials. It is primarily needed by R&D chemists and process development scientists in the pharmaceutical, agrochemical, and materials science industries for creating novel compounds with targeted properties.

Application

• As a key synthetic intermediate in pharmaceutical research for the development of new active pharmaceutical ingredients (APIs).
• Utilized in agrochemical synthesis for creating novel herbicides, fungicides, or plant growth regulators.
• Serving as a precursor in materials science for the development of advanced polymers, dendrimers, or organic electronic materials.
• Employed in academic and industrial R&D for methodology development in click chemistry, cycloaddition reactions, and cross-coupling protocols.
• Potential use in the synthesis of specialty fine chemicals and complex natural product analogs.

Basic Information

Product Name	Cyclopentene, 1-Ethynyl-5-(2-Propynylidene)- (9Ci)
CAS No.	117286-09-6
Molecular Formula	C10H8
Molecular Weight	128.17 g/mol
Synonyms	1-Ethynyl-5-(prop-2-yn-1-ylidene)cyclopentene; 1,5-Diethynylidene-2-cyclopentene; 1-Ethynyl-5-propynylidenecyclopentene; 2-Cyclopentene-1,5-diylidenediethyne; (9CI) Index name; 1,5-Diethynylidene-2-cyclopentene (alternative); Contact for additional IUPAC or trade names.
EINECS	Contact for details

Quality Control

Every batch of Cyclopentene, 1-Ethynyl-5-(2-Propynylidene)- (9Ci) is produced and controlled under a strict quality management system. Our products undergo rigorous quality testing, including chromatographic purity analysis, to ensure compliance with customer specifications and industry standards. A comprehensive Certificate of Analysis (COA) detailing identity, purity, and impurity profiles is available upon request to support your quality assurance and regulatory needs.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and well-ventilated place at room temperature (typically 15-25°C). Keep away from heat, sparks, open flames, and strong oxidizing agents. Due to its light-sensitive nature, containers should be amber-colored or stored in dark conditions.

Specification

Item	Specification
Appearance	Colorless to pale yellow liquid or low-melting solid
Identification (IR)	Conforms to structure
Purity (HPLC/GC)	≥95% (Typical, higher grades available)
Water Content (KF)	≤0.5%

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