Description

1-Cyclopentene-1-Carboxylic Acid, 2-Ethynyl-, Methyl Ester (9Ci) is a specialized, high-value chemical intermediate featuring both a cyclopentene ring and an ethynyl group, making it a versatile building block for complex organic synthesis. Its unique structure is critical for constructing advanced molecular frameworks, particularly in pharmaceutical and agrochemical research and development. This compound is essential for chemists and manufacturers in the fine chemical, life science, and advanced material sectors seeking to develop novel active ingredients and functional molecules.

Application

• Pharmaceutical Intermediate: Serves as a key precursor in the synthesis of novel drug candidates, particularly those targeting central nervous system (CNS) disorders and anti-inflammatory applications.
• Agrochemical Synthesis: Used in the research and development of new-generation pesticides and herbicides, leveraging its reactive ethynyl group for structural diversification.
• Material Science Research: Acts as a monomer or cross-linking agent in the development of specialty polymers and advanced organic materials with tailored properties.
• Organic Synthesis Building Block: Employed in academic and industrial R&D for cycloaddition reactions and the construction of complex, polycyclic structures.
• Ligand and Catalyst Development: Utilized in the preparation of novel ligands for asymmetric catalysis and metal-organic frameworks (MOFs).

Basic Information

Product Name	1-Cyclopentene-1-Carboxylic Acid, 2-Ethynyl-, Methyl Ester (9Ci)
CAS No.	320608-56-8
Molecular Formula	C9H10O2
Molecular Weight	150.17 g/mol
Synonyms	Methyl 2-ethynyl-1-cyclopentene-1-carboxylate; 2-Ethynyl-1-cyclopentenecarboxylic acid methyl ester; 1-Cyclopentenecarboxylic acid, 2-ethynyl-, methyl ester; Methyl 2-ethynylcyclopent-1-ene-1-carboxylate; 320608-56-8; 2-Ethynylcyclopent-1-ene-1-carboxylic acid methyl ester
EINECS	Contact for details

Quality Control

Our production of 1-Cyclopentene-1-Carboxylic Acid, 2-Ethynyl-, Methyl Ester (9Ci) adheres to stringent quality management protocols. Each batch undergoes comprehensive analytical testing, including HPLC, GC, NMR, and IR spectroscopy, to ensure identity, purity, and consistency. Certificates of Analysis (COA) detailing all specifications are provided with every shipment. We operate under a quality system designed to meet the rigorous standards required for pharmaceutical and advanced chemical intermediates.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and well-ventilated area at a controlled room temperature (typically 15-25°C). Keep away from strong acids and incompatible organic solvents. For long-term storage, consider maintaining the material under an inert atmosphere to preserve stability.

Specification

Item	Specification
Appearance	Colorless to pale yellow liquid
Identification (IR)	Conforms to structure
Purity (by GC/HPLC)	≥ 97.0%
Water Content (KF)	≤ 0.5%
Residue on Ignition	≤ 0.1%

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