Description

2-Cyclopenten-1-One, 4-Methyl-5-(2-Methylpropylidene)-, (4R,5E)- (9Ci) is a high-purity, stereochemically defined cyclopentenone derivative, serving as a critical chiral building block in advanced organic synthesis. Its unique structure, featuring a defined (4R,5E) configuration and an exocyclic double bond, makes it an invaluable intermediate for constructing complex molecules with precise stereochemistry. This compound is essential for research and development chemists in the pharmaceutical, agrochemical, and fine chemical industries, where it is used to create novel active ingredients and functional materials.

Application

• Pharmaceutical Intermediate: Key chiral synthon for the synthesis of prostaglandins, terpenoids, and other bioactive molecules with defined stereocenters.
• Agrochemical Synthesis: Building block for developing novel pesticides and herbicides with enhanced efficacy and selectivity.
• Fine Chemical Production: Used in the manufacture of specialty chemicals, flavors, and fragrances requiring specific isomeric purity.
• Academic & Industrial R&D: A valuable reagent for methodological development in asymmetric synthesis and total synthesis projects.
• Material Science Precursor: Potential starting material for synthesizing specialized polymers or ligands with specific spatial arrangements.

Basic Information

Product Name	2-Cyclopenten-1-One, 4-Methyl-5-(2-Methylpropylidene)-, (4R,5E)- (9Ci)
CAS No.	689290-74-2
Molecular Formula	C10H14O
Molecular Weight	150.22 g/mol
Synonyms	(4R,5E)-4-Methyl-5-(2-methylpropylidene)cyclopent-2-en-1-one; (4R,5E)-4-Methyl-5-isobutylidene-2-cyclopenten-1-one; 4-Methyl-5-(2-methylpropylidene)-2-cyclopenten-1-one, (4R,5E)-; (4R,5E)-4-Methyl-5-(2-methylpropylidene)cyclopent-2-enone; (R,E)-4-Methyl-5-(2-methylpropylidene)cyclopent-2-en-1-one
EINECS	Contact for details

Quality Control

Our production of 2-Cyclopenten-1-One, 4-Methyl-5-(2-Methylpropylidene)-, (4R,5E)- (9Ci) adheres to stringent quality management protocols to ensure batch-to-batch consistency and high isomeric purity. Each lot is characterized using advanced analytical techniques including chiral HPLC, GC-MS, and NMR spectroscopy to confirm identity, stereochemical purity, and chemical purity. Certificates of Analysis (COA) detailing all specifications are provided with every shipment.

Storage

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

Specification

Item	Specification
Appearance	Colorless to pale yellow liquid
Identification (IR)	Conforms to structure
Identification (NMR)	Conforms to structure
Purity (GC)	≥ 97.0%
Chiral Purity (Chiral HPLC)	≥ 98.0% ee (4R,5E)
Water Content (KF)	≤ 0.5%

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