Description

(-)-trans-Rose Oxide CAS NO 5258-11-7 is a high-purity, optically active monoterpene ether known for its characteristic floral-rosy and green odor profile. This compound is a key chiral building block and fragrance ingredient, prized for its ability to impart natural, fresh, and sophisticated olfactory nuances. It is essential for fine fragrance compounding, flavor creation, and advanced organic synthesis in the flavor and fragrance (F&F), cosmetic, and pharmaceutical industries.

Application

• Fine Fragrance Formulation: A premium ingredient in high-end perfumes, colognes, and eau de toilettes to create natural rose, geranium, and floral-green accords.
• Flavor & Fragrance (F&F) Synergy: Used to enhance and round off flavor profiles in beverages, confectionery, and dairy products, adding subtle floral notes.
• Cosmetic & Personal Care: Incorporated into soaps, lotions, shampoos, and other scented products for a stable and appealing rose-like fragrance.
• Aromatherapy & Home Care: Serves as a component in essential oil blends, diffusers, candles, and air fresheners for its calming and pleasant aroma.
• Chemical Synthesis: Acts as a valuable chiral intermediate or starting material in the synthesis of more complex fragrance molecules and pharmaceutical agents.
• Tobacco Flavoring: Utilized to modify and improve the aroma profile of tobacco products.

Basic Information

Product Name	(-)-trans-Rose Oxide
CAS No.	5258-11-7
Molecular Formula	C10H18O
Molecular Weight	154.25 g/mol
Synonyms	(-)-trans-2-(2-Methyl-1-propenyl)-4-methyltetrahydropyran; (2R,4S)-4-Methyl-2-(2-methylprop-1-en-1-yl)tetrahydro-2H-pyran; Laevorotatory trans-Rose Oxide; (R)-trans-Rose Oxide; (4S)-(-)-trans-Rose Oxide; Rose Oxide L; Tetrahydro-4-methyl-2-(2-methyl-1-propenyl)-2H-pyran, (2R-trans)-
EINECS	226-066-6

Quality Control

Our (-)-trans-Rose Oxide is produced and controlled under a strict quality management system. Each batch undergoes rigorous analytical testing, including chiral purity assessment by GC or HPLC, to ensure it meets the high standards required for fragrance and flavor applications. A comprehensive Certificate of Analysis (COA) detailing identity, purity, optical rotation, and impurity profile is provided with every shipment.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, well-ventilated area at controlled room temperature (15-25°C). This material is highly volatile and easily oxidized; for long-term storage, maintaining an inert atmosphere (e.g., under nitrogen) is recommended to preserve stability and prevent degradation.

Specification

Item	Specification
Appearance	Colorless to pale yellow liquid
Identification (IR)	Conforms to reference spectrum
Assay (GC)	≥ 98.0%
Chiral Purity (GC)	≥ 99.0% (-)-trans isomer
Optical Rotation [α]20/D	-30° to -40° (c=1 in ethanol)
Refractive Index n20/D	1.453 - 1.463
Relative Density (20°C)	0.870 - 0.880

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