Description

3-Cyclopentene-1-Carboxylic Acid, 1-(Chlorocarbonyl)-, Ethyl Ester (9Ci) is a versatile bifunctional organic intermediate containing both a reactive acid chloride and an ester group on a cyclopentene backbone. This compound matters for its role as a key building block in the synthesis of complex molecules, enabling the introduction of the cyclopentene moiety and further functionalization. It is primarily needed by R&D chemists and process development scientists in the pharmaceutical, agrochemical, and advanced materials industries for constructing novel active ingredients and specialty polymers.

Application

• Pharmaceutical Intermediate: Serves as a critical precursor in the synthesis of novel drug candidates, particularly those targeting central nervous system (CNS) disorders or anti-inflammatory pathways.
• Agrochemical Synthesis: Used in the research and development of new herbicides, fungicides, and plant growth regulators that require a functionalized cyclopentene structure.
• Polymer & Material Science: Acts as a monomer or cross-linking agent for creating specialty polymers with unique thermal or mechanical properties.
• Organic Synthesis Building Block: Employed in academic and industrial research for Diels-Alder reactions, nucleophilic acyl substitutions, and other transformations to construct complex carbocyclic frameworks.
• Ligand & Catalyst Development: Utilized in the preparation of novel chiral ligands or organometallic catalysts for asymmetric synthesis.
• Fine Chemical Production: Integral to the multi-step synthesis of flavors, fragrances, and other high-value specialty chemicals.

Basic Information

Product Name	3-Cyclopentene-1-Carboxylic Acid, 1-(Chlorocarbonyl)-, Ethyl Ester (9Ci)
CAS No.	76910-09-3
Molecular Formula	C9H11ClO3
Molecular Weight	202.63 g/mol
Synonyms	1-(Chlorocarbonyl)-3-cyclopentene-1-carboxylic acid ethyl ester; Ethyl 1-(chlorocarbonyl)-3-cyclopentene-1-carboxylate; 3-Cyclopentene-1-carboxylic acid, 1-(chlorocarbonyl)-, ethyl ester; 1-Carboxy-3-cyclopentene-1-carboxylic acid ethyl ester chloride; Cyclopent-3-ene-1,1-dicarboxylic acid ethyl ester chloride; Ethyl 3-cyclopentene-1,1-dicarboxylate chloride
EINECS	Contact for details

Quality Control

Our 3-Cyclopentene-1-Carboxylic Acid, 1-(Chlorocarbonyl)-, Ethyl Ester (9Ci) is produced under strict quality management protocols. Every batch undergoes rigorous analytical testing to ensure identity, purity, and consistency, meeting the high standards required for research and process chemistry. Certificates of Analysis (COA) detailing purity, assay, and impurity profiles are available upon request to support your quality assurance and regulatory documentation.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and well-ventilated area at controlled room temperature (15-25°C). Due to its hygroscopic (moisture-sensitive) nature and reactivity as a strong acid/organic solvent derivative, the container must be kept tightly sealed under an inert atmosphere (e.g., nitrogen or argon) after opening to prevent hydrolysis and degradation. Keep away from heat, sparks, open flames, and incompatible materials such as strong bases and oxidizing agents.

Specification

Item	Specification
Appearance	Colorless to pale yellow liquid
Identification (IR)	Conforms to structure
Purity (HPLC)	≥ 95.0%
Assay	≥ 97.0%
Water Content (KF)	≤ 0.5%
Related Substances (HPLC)	Individual impurity ≤ 1.0%; Total impurities ≤ 3.0%

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