Description

1-Cyclobutene-1-Carboxylicacid,2-Methyl-3-Oxo-,Methylester(9Ci) is a specialized organic building block characterized by its cyclobutene ring fused with a β-keto ester functional group. This unique molecular architecture makes it a valuable intermediate for synthesizing complex, strained-ring systems and fine chemicals. It is primarily sought after by research chemists and process development scientists in the pharmaceutical and advanced materials sectors for constructing novel molecular scaffolds.

Application

• Pharmaceutical Intermediate: A key precursor in the synthesis of novel active pharmaceutical ingredients (APIs), particularly those requiring strained carbocyclic or heterocyclic frameworks.
• Agrochemical Research: Used in the development of new herbicides, fungicides, and insecticides where the cyclobutene moiety can impart unique biological activity.
• Material Science: Serves as a monomer or cross-linking agent in the research of polymers with specific thermal or mechanical properties derived from its strained ring system.
• Organic Synthesis Building Block: Employed in [4+2] cycloaddition (Diels-Alder) reactions and other cyclization strategies to create complex polycyclic compounds.
• Academic & Industrial R&D: A critical reagent for methodological studies in synthetic organic chemistry, enabling new routes to challenging molecular targets.

Basic Information

Product Name	1-Cyclobutene-1-Carboxylicacid,2-Methyl-3-Oxo-,Methylester(9Ci)
CAS No.	112139-53-4
Molecular Formula	C8H10O3
Molecular Weight	154.16 g/mol
Synonyms	Methyl 2-methyl-3-oxo-1-cyclobutene-1-carboxylate; 1-Cyclobutene-1-carboxylic acid, 2-methyl-3-oxo-, methyl ester; 2-Methyl-3-oxo-1-cyclobutene-1-carboxylic acid methyl ester; Methyl 2-methyl-3-oxocyclobut-1-ene-1-carboxylate; 3-Oxo-2-methyl-1-cyclobutene-1-carboxylic acid methyl ester
EINECS	Contact for details

Quality Control

Our production of 1-Cyclobutene-1-Carboxylicacid,2-Methyl-3-Oxo-,Methylester(9Ci) adheres to stringent internal quality standards to ensure batch-to-batch consistency and purity for research and development applications. Each lot is analyzed via modern chromatographic and spectroscopic techniques. A comprehensive Certificate of Analysis (COA) detailing purity, identity, and impurity profiles is provided with every shipment to support your quality assurance protocols.

Storage

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

Specification

Item	Specification
Appearance	Colorless to pale yellow liquid or solid
Identification (IR)	Conforms to structure
Purity (HPLC)	≥ 95.0% (Area %)
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.