Description

1-Cyclobutene-1-Carboxylic Acid, 3-Methylene-, Methyl Ester (9Ci) is a specialized, high-purity organic building block featuring a reactive cyclobutene core. This compound matters as a versatile synthon for advanced organic synthesis, enabling the construction of complex molecular architectures in pharmaceutical and material science research. It is primarily needed by R&D chemists and process development scientists in the fine chemical, agrochemical, and advanced polymer industries seeking to introduce strained ring systems or specific functional handles into target molecules.

Application

• Pharmaceutical Intermediate: Serves as a key precursor in the synthesis of novel active pharmaceutical ingredients (APIs), particularly those containing strained carbocyclic systems.
• Agrochemical Research: Used in developing new generations of herbicides and fungicides where the cyclobutene moiety can impart unique biological activity.
• Material Science & Polymer Chemistry: Acts as a monomer or cross-linking agent for creating polymers with tailored thermal and mechanical properties.
• Organic Synthesis Building Block: Employed in Diels-Alder reactions, [2+2] cycloadditions, and other cyclization strategies to construct complex natural product analogs and specialty chemicals.
• Ligand & Catalyst Development: Utilized for synthesizing novel chelating ligands or organometallic complexes for catalytic applications.

Basic Information

Product Name	1-Cyclobutene-1-Carboxylic Acid, 3-Methylene-, Methyl Ester (9Ci)
CAS No.	86741-79-9
Molecular Formula	C7H8O2
Molecular Weight	124.14 g/mol
Synonyms	Methyl 3-Methylene-1-cyclobutene-1-carboxylate; 3-Methylene-1-cyclobutene-1-carboxylic Acid Methyl Ester; 1-Cyclobutene-1-carboxylic acid, 3-methylene-, methyl ester; Methyl 3-methylenebut-1-ene-1-carboxylate
EINECS	Contact for details

Quality Control

Our 1-Cyclobutene-1-Carboxylic Acid, 3-Methylene-, Methyl Ester (9Ci) is manufactured under strict quality management systems. Each batch undergoes rigorous analytical testing, including chromatography and spectroscopy, to ensure high purity and batch-to-batch consistency suitable for research and scale-up. Certificates of Analysis (COA) detailing purity, identity, and impurity profiles are provided with every shipment.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and well-ventilated place. Recommended storage temperature is between 2°C and 8°C (refrigerated) for long-term stability. Allow the container to reach room temperature before opening to minimize moisture ingress.

Specification

Item	Specification
Appearance	Colorless to pale yellow liquid
Identification (IR)	Conforms to structure
Purity (GC)	≥ 95.0%
Water Content (KF)	≤ 0.5%

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