Description

Cyclopentanecarboxylic Acid, 3-Ethyl-2-Oxo-, 1,1-Dimethylethyl Ester (9Ci) is a high-purity, specialized organic ester building block of significant interest in advanced chemical synthesis. Its value lies in its unique molecular architecture, featuring a cyclopentane ring fused with a keto-ester functional group, making it a versatile precursor for complex molecule construction. This compound is primarily needed by research institutions and industrial R&D teams in the pharmaceutical, agrochemical, and fine chemical sectors for developing novel active ingredients and functional materials.

Application

• Pharmaceutical Intermediate: A key chiral synthon in the research and development of new active pharmaceutical ingredients (APIs), particularly for central nervous system (CNS) and metabolic disorder targets.
• Agrochemical Synthesis: Serves as a critical building block for creating novel herbicides, fungicides, and insecticides with enhanced efficacy and selectivity.
• Fine Chemical Production: Used in the synthesis of specialty chemicals, including flavors, fragrances, and advanced polymer additives.
• Academic & Contract Research: Employed in methodological studies and as a standard in organic chemistry research focused on ring transformations and ester chemistry.
• Material Science: Investigated as a monomer or cross-linking agent for developing polymers with specific thermal or mechanical properties.

Basic Information

Item	Details
Product Name	Cyclopentanecarboxylic Acid, 3-Ethyl-2-Oxo-, 1,1-Dimethylethyl Ester (9Ci)
CAS No.	820236-09-7
Molecular Formula	C12H20O3
Molecular Weight	212.29 g/mol
Synonyms	tert-Butyl 3-ethyl-2-oxocyclopentanecarboxylate; 1,1-Dimethylethyl 3-ethyl-2-oxocyclopentanecarboxylate; 3-Ethyl-2-oxocyclopentanecarboxylic acid tert-butyl ester; tert-Butyl 3-ethyl-2-oxocyclopentane-1-carboxylate; Cyclopentanecarboxylic acid, 3-ethyl-2-oxo-, 1,1-dimethylethyl ester; 820236-09-7; 9CI
EINECS	Contact for details

Quality Control

Our production of Cyclopentanecarboxylic Acid, 3-Ethyl-2-Oxo-, 1,1-Dimethylethyl Ester (9Ci) adheres to stringent quality management protocols. Each batch undergoes comprehensive analytical testing, including chromatography and spectroscopy, to ensure identity, purity, and consistency. Certificates of Analysis (COA) detailing all specifications are provided and can be tailored to meet specific customer or regulatory requirements.

Storage

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

Specification

Item	Specification
Appearance	Colorless to pale yellow liquid
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 97.0%
Purity (GC)	≥ 98.0%
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.