Description

Cyclopentanecarboxylic Acid, 2,2,3,3-Tetramethyl-5-Oxo-, Methyl Ester (9Ci) is a high-purity, synthetically valuable organic ester characterized by its unique sterically hindered cyclopentane backbone. This compound matters as a sophisticated chemical intermediate, offering a rigid, multi-substituted framework essential for constructing complex molecular architectures in advanced research and development. It is primarily needed by pharmaceutical chemists and agrochemical researchers for applications in drug discovery, process chemistry, and the synthesis of novel active ingredients.

Application

• Pharmaceutical Intermediate: A key building block in the synthesis of novel active pharmaceutical ingredients (APIs), particularly those requiring sterically constrained, chiral centers.
• Agrochemical Synthesis: Used in the research and development of advanced pesticides and herbicides, where its structural complexity can contribute to unique biological activity.
• Organic Synthesis & Process Chemistry: Serves as a versatile precursor for constructing complex polycyclic compounds, natural product analogs, and specialty fine chemicals.
• Material Science Research: Investigated as a monomer or additive for creating polymers with specific thermal or mechanical properties due to its bulky, functionalized structure.
• Catalysis & Ligand Development: The ester and ketone functionalities provide handles for modification into chiral ligands or organocatalysts for asymmetric synthesis.
• Flavor & Fragrance Industry: Potential use as an intermediate for synthesizing high-value aroma chemicals with complex, musky, or amber notes.

Basic Information

Product Name	Cyclopentanecarboxylic Acid, 2,2,3,3-Tetramethyl-5-Oxo-, Methyl Ester (9Ci)
CAS No.	675140-41-7
Molecular Formula	C11H18O3
Molecular Weight	198.26 g/mol
Synonyms	Methyl 2,2,3,3-tetramethyl-5-oxocyclopentanecarboxylate; 5-Oxo-2,2,3,3-tetramethylcyclopentanecarboxylic acid methyl ester; 2,2,3,3-Tetramethyl-5-oxocyclopentanecarboxylic Acid Methyl Ester; Cyclopentanecarboxylic acid, 2,2,3,3-tetramethyl-5-oxo-, methyl ester; Methyl 5-oxo-2,2,3,3-tetramethyl-1-cyclopentanecarboxylate
EINECS	Contact for details

Quality Control

Our Cyclopentanecarboxylic Acid, 2,2,3,3-Tetramethyl-5-Oxo-, Methyl Ester (9Ci) is manufactured under strict quality management systems. Every batch undergoes rigorous analytical testing, including HPLC, GC, and NMR, to ensure high chemical purity and consistent lot-to-lot performance. A comprehensive Certificate of Analysis (COA) detailing identity, purity, and impurity profiles is provided with each shipment to support your quality assurance and regulatory compliance needs.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, well-ventilated area at room temperature (15-25°C). Keep away from strong oxidizing agents, strong acids, and strong bases.

Specification

Item	Specification
Appearance	Colorless to pale yellow liquid
Identification (IR)	Conforms to structure
Purity (HPLC)	≥ 97.0%
Water Content (KF)	≤ 0.5%

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