Description

2-Cyclopenten-1-One, 3-Bromo-5-Ethylidene-2-Hydroxy-4-Methyl-, (4S,5E)- (9Ci) is a high-value, stereochemically defined brominated cyclopentenone derivative. This compound serves as a sophisticated chiral building block and synthetic intermediate, prized for its unique functional group array that enables complex molecular construction. It is primarily sought after by research chemists and process development scientists in the pharmaceutical and agrochemical industries for the synthesis of novel active ingredients and fine chemicals.

Application

• Pharmaceutical Intermediate: A key chiral synthon for the research and development of new drug candidates, particularly in constructing complex heterocyclic or polycyclic core structures.
• Agrochemical Synthesis: Used in the development of advanced pesticides and herbicides, leveraging its reactive bromine and ketone functionalities.
• Organic Synthesis Research: Employed in academic and industrial R&D labs as a versatile substrate for novel cycloaddition, cross-coupling, and functionalization reactions.
• Fine Chemical Production: Acts as a precursor in the multi-step synthesis of specialty chemicals, flavors, and fragrances requiring specific stereochemistry.
• Material Science: Potential monomer or cross-linking agent in the development of novel polymers with specific optical or electronic properties.

Basic Information

Product Name	2-Cyclopenten-1-One, 3-Bromo-5-Ethylidene-2-Hydroxy-4-Methyl-, (4S,5E)- (9Ci)
CAS No.	462116-80-9
Molecular Formula	C8H9BrO2
Molecular Weight	217.06 g/mol
Synonyms	(4S,5E)-3-Bromo-5-ethylidene-2-hydroxy-4-methylcyclopent-2-en-1-one; 3-Bromo-5-ethylidene-2-hydroxy-4-methyl-2-cyclopenten-1-one, (4S,5E)-; Brominated Chiral Cyclopentenone; (4S,5E)-Bromo-hydroxy-methyl-ethylidene cyclopentenone; 2-Cyclopenten-1-one, 3-bromo-5-ethylidene-2-hydroxy-4-methyl-, (4S,5E)-; CAS 462116-80-9
EINECS	Contact for details

Quality Control

Our 2-Cyclopenten-1-One, 3-Bromo-5-Ethylidene-2-Hydroxy-4-Methyl-, (4S,5E)- (9Ci) is manufactured under strict quality control protocols to ensure batch-to-batch consistency and high purity. Each lot is supported by a comprehensive Certificate of Analysis (COA) detailing purity, chiral purity (enantiomeric excess), and impurity profiles. We adhere to cGMP principles where applicable, and our quality systems are designed to meet the stringent requirements of research and pre-clinical development.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and well-ventilated area at a controlled room temperature (typically 15-25°C). This compound is light-sensitive (store away from light). Keep container tightly sealed when not in use to protect from moisture.

Specification

Item	Specification
Appearance	White to off-white crystalline powder
Identification (IR)	Conforms to structure
Purity (HPLC)	≥ 97.0%
Chiral Purity (Chiral HPLC)	≥ 98.0% e.e.
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.