Description

Acetaldehyde, [2-Methyl-5-(1-Methylethyl)cyclopentylidene]-, (1E,2Alpha,5Ba)- (9Ci) is a specialized, high-purity aldehyde derivative with a complex cyclic structure, offering unique reactivity and stereochemistry for advanced chemical synthesis. This compound matters as a critical chiral building block and intermediate for creating sophisticated fragrance molecules, pharmaceutical actives, and fine chemicals where precise molecular architecture is required. It is primarily needed by R&D chemists and process development teams in the fragrance & flavor, pharmaceutical, and agrochemical industries seeking to develop novel compounds with specific olfactory or biological properties.

Application

• Fragrance & Flavor Intermediate: A key chiral precursor for the synthesis of complex, high-value musks, woody, and amber fragrance notes.
• Pharmaceutical Building Block: Used in the research and development of active pharmaceutical ingredients (APIs), particularly those requiring stereochemically defined aldehyde functionalities.
• Agrochemical Synthesis: Serves as an intermediate in creating advanced pesticides and herbicides with specific stereoisomeric activity.
• Fine Chemical Production: Employed in custom synthesis and contract manufacturing for specialty chemicals requiring its unique reactive site and structural framework.
• Organic Synthesis Research: A valuable reagent in academic and industrial laboratories for studying cyclization reactions, aldol condensations, and asymmetric synthesis.
• Perfumery Compound Manufacturing: Integral to the production of proprietary aroma chemicals that impart depth and longevity to premium fragrance compositions.

Basic Information

Product Name	Acetaldehyde, [2-Methyl-5-(1-Methylethyl)cyclopentylidene]-, (1E,2Alpha,5Ba)- (9Ci)
CAS No.	189040-17-3
Molecular Formula	C11H18O
Molecular Weight	166.26 g/mol
Synonyms	(1E,2α,5β)-2-Methyl-5-(propan-2-ylidene)cyclopentane-1-carbaldehyde; (1E,2Alpha,5Ba)-2-Methyl-5-(1-methylethylidene)cyclopentanecarboxaldehyde; 2-Methyl-5-isopropylidenecyclopentanecarbaldehyde (stereospecific); (1E,2α,5β)-Form of the aldehyde; CAS 189040-17-3; A specialty aldehyde fragrance intermediate.
EINECS	Contact for details

Quality Control

Our production of Acetaldehyde, [2-Methyl-5-(1-Methylethyl)cyclopentylidene]-, (1E,2Alpha,5Ba)- (9Ci) adheres to stringent quality management protocols to ensure batch-to-batch consistency and high chemical purity. Each lot undergoes comprehensive analytical testing, including chiral purity assessment by GC or HPLC, identity confirmation by IR and NMR, and quantification of key impurities. A detailed Certificate of Analysis (COA) documenting all specifications is provided with every shipment to support your quality assurance and regulatory needs.

Storage

Preserve in a tightly closed container, protected from light. Store under an inert atmosphere (e.g., nitrogen or argon) in a cool, dry, and well-ventilated area at controlled room temperature (15-25°C). Due to its easily oxidized nature, minimize headspace and exposure to air after opening. Keep away from heat, sparks, and open flames.

Specification

Item	Specification
Appearance	Colorless to pale yellow liquid
Identification (IR)	Conforms to reference spectrum
Identification (NMR)	Conforms to structure
Purity (GC/HPLC)	≥ 97.0%
Chiral Purity (GC/HPLC)	≥ 98.0% (1E,2α,5β isomer)
Water Content (KF)	≤ 0.5%

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