Description

1-Cyclopentene-1-Carboxylicacid,5-Oxo-,Methylester(9Ci) is a specialized organic building block featuring a cyclopentenone core esterified with a carboxylic acid methyl ester, making it a versatile synthon for complex molecular construction. This compound matters for its role as a key intermediate in the synthesis of pharmaceuticals, agrochemicals, and advanced materials, where its unique bicyclic structure enables the introduction of functional complexity. It is primarily needed by research and development chemists, process development scientists, and manufacturers in the fine chemical, pharmaceutical, and agrochemical industries.

Application

• Pharmaceutical Intermediate: Serves as a critical precursor in the synthesis of active pharmaceutical ingredients (APIs), particularly those with complex cyclic or fused-ring systems.
• Agrochemical Synthesis: Used in the development and production of novel herbicides, fungicides, and plant growth regulators.
• Fine Chemical Production: Acts as a building block for creating specialty chemicals, flavors, fragrances, and advanced polymer additives.
• Academic & Industrial Research: A valuable reagent in organic chemistry research for methodology development and the exploration of new chemical spaces.
• Material Science: Potential use in the synthesis of organic electronic materials or ligands for catalytic systems.

Basic Information

Product Name	1-Cyclopentene-1-Carboxylicacid,5-Oxo-,Methylester(9Ci)
CAS No.	36601-73-7
Molecular Formula	C8H10O3
Molecular Weight	154.16 g/mol
Synonyms	5-Oxo-1-cyclopentene-1-carboxylic acid methyl ester; Methyl 5-oxo-1-cyclopentene-1-carboxylate; 1-Cyclopentene-1-carboxylic acid, 5-oxo-, methyl ester; Methyl 2-oxo-3-cyclopentene-1-carboxylate; 3-Carbomethoxy-2-cyclopentenone; 2-Cyclopenten-1-one, 3-(methoxycarbonyl)-; 3-Methoxycarbonyl-2-cyclopenten-1-one
EINECS	Contact for details

Quality Control

Our 1-Cyclopentene-1-Carboxylicacid,5-Oxo-,Methylester(9Ci) is produced under a strict quality management system. Each batch undergoes rigorous analytical testing to ensure identity, purity, and consistency. Certificates of Analysis (COA) detailing specifications such as assay (by HPLC), impurity profile, and physical characteristics are provided and available upon request to support your quality assurance protocols.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and well-ventilated area. Recommended storage temperature is 2-8°C for long-term stability. Keep away from heat, sparks, and open flame. The container must be kept tightly closed in a dry and well-ventilated place.

Specification

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

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