Description

4-Cyclobutyl-4-Oxo-2-Butynoic Acid Ethyl Ester is a specialized organic building block featuring a cyclobutyl ketone and an acetylenic ester moiety, making it a versatile synthon for advanced chemical synthesis. Its unique structure is critical for constructing complex molecular architectures, particularly in pharmaceutical and agrochemical research and development. This high-purity intermediate is essential for medicinal chemists and process development scientists working on novel active ingredients.

Application

• Pharmaceutical Intermediate: A key building block in the synthesis of novel drug candidates, particularly those targeting central nervous system (CNS) disorders and anti-inflammatory pathways.
• Agrochemical Synthesis: Used in the research and development of new generation herbicides and fungicides, leveraging its reactive alkyne and ketone functionalities.
• Material Science Research: Serves as a precursor for specialty polymers and advanced organic materials requiring rigid, cyclobutane-based backbones.
• Chemical Biology Probes: Utilized in the creation of molecular probes and tags for studying enzyme mechanisms and protein interactions due to its "click chemistry" compatible alkyne group.
• Academic & Contract Research: A valuable reagent for methodology development in organic synthesis, including cycloaddition reactions and cross-coupling protocols.

Basic Information

Product Name	4-Cyclobutyl-4-Oxo-2-Butynoic Acid Ethyl Ester
CAS No.	54966-51-7
Molecular Formula	C10H12O3
Molecular Weight	180.20 g/mol
Synonyms	Ethyl 4-Cyclobutyl-4-oxo-2-butynoate; 2-Butynoic acid, 4-cyclobutyl-4-oxo-, ethyl ester; 4-Cyclobutyl-4-oxobut-2-ynoic acid ethyl ester; Ethyl 4-cyclobutanoyl-2-butynoate; Acetylene carboxylic acid ester derivative; Cyclobutyl ethynyl ketone ethyl ester; But-2-ynoic acid, 4-cyclobutyl-4-oxo-, ethyl ester
EINECS	Contact for details

Quality Control

Our 4-Cyclobutyl-4-Oxo-2-Butynoic Acid Ethyl Ester is manufactured under strict quality management systems. Every batch undergoes rigorous analytical testing, including HPLC, GC, NMR, and mass spectrometry, to ensure identity, purity, and consistency. We provide comprehensive Certificates of Analysis (COA) with each shipment, detailing all critical parameters. Our quality commitment supports applications in cGMP and ISO-compliant environments, ensuring reliable integration into your sensitive synthesis workflows.

Storage

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

Specification

Item	Specification
Appearance	Colorless to pale yellow liquid
Identification (IR)	Conforms to structure
Identification (NMR)	Conforms to structure
Purity (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.