Description

Cyclopentanecarbonyl Chloride, 1-Methyl-2-Methylene- (9Ci) is a specialized organic building block featuring a reactive acid chloride group and an exocyclic methylene unit. This compound is valued for its dual functionality, enabling it to act as an acylating agent while also participating in cycloaddition and polymerization reactions. It is primarily sought by R&D chemists and process development scientists in the pharmaceutical, agrochemical, and advanced materials sectors for synthesizing novel cyclic and polymeric structures.

Application

• Pharmaceutical Intermediate: Key building block for the synthesis of novel active pharmaceutical ingredients (APIs), particularly those with complex carbocyclic or bridged ring systems.
• Agrochemical Synthesis: Used in the research and development of new herbicides, fungicides, and plant growth regulators that require specific cyclic ketone or lactam precursors.
• Polymer Chemistry: Serves as a monomer or co-monomer in the production of specialty polymers, where the methylene group can facilitate cross-linking or copolymerization.
• Organic Synthesis & Research: A versatile reagent for academic and industrial research, enabling Diels-Alder reactions, nucleophilic acyl substitutions, and the construction of spirocyclic compounds.
• Fine Chemical Production: Employed in the multi-step synthesis of complex fragrance molecules, dyes, and other high-value specialty chemicals.

Basic Information

Product Name	Cyclopentanecarbonyl Chloride, 1-Methyl-2-Methylene- (9Ci)
CAS No.	85620-37-7
Molecular Formula	C8H11ClO
Molecular Weight	158.62 g/mol
Synonyms	1-Methyl-2-methylenecyclopentanecarbonyl chloride; 2-Methylene-1-methylcyclopentanecarboxylic acid chloride; Cyclopentanecarboxylic acid, 1-methyl-2-methylene-, chloride; 1-Methyl-2-methylidenecyclopentane-1-carbonyl chloride
EINECS	Contact for details

Quality Control

Our production of Cyclopentanecarbonyl Chloride, 1-Methyl-2-Methylene- (9Ci) adheres to stringent internal quality protocols to ensure batch-to-batch consistency and reliability for your synthetic processes. Each lot is analyzed using advanced techniques including GC, HPLC, and NMR spectroscopy. A comprehensive Certificate of Analysis (COA) detailing purity, identity, and impurity profiles is provided with every shipment to support your quality management systems.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and well-ventilated place. Due to its hygroscopic (moisture-sensitive) nature, containers must be kept sealed under an inert atmosphere (e.g., nitrogen or argon) after opening to prevent hydrolysis and degradation. Recommended storage temperature is 2-8°C for long-term stability.

Specification

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