3-methyl-6-ethyl-5-octen-1-ol

3-methyl-6-ethyl-5-octen-1-ol is an aliphatic unsaturated alcohol characterized by the molecular formula C₁₁H₂₂O. This compound belongs to the class of primary alcohols featuring an eight-carbon chain with methyl and ethyl substituents and a double bond near the alcohol group. It is primarily identified by its floral aldehydic odor reminiscent of lily of the valley and muguet, making it valuable in fragrance applications. Synonyms include 6-ethyl-3-methyl oct-5-en-1-ol and 5-octen-1-ol, 6-ethyl-3-methyl-. This material is typically derived through chemical synthesis routes and can be found referenced in chemical databases such as PubChem (CID 117305). Its physical form is generally a liquid with characteristic perfuming properties, and it is utilized in specialized fragrance formulations due to its distinctive scent profile.

3-methyl-6-ethyl-5-octen-1-ol occurs as a synthetic fragrance ingredient rather than a naturally abundant substance. Its floral aldehydic character finds use mainly in perfuming agents, contributing fresh and elegant notes to complex scent profiles. The compound is recognized in fragrance industry standards such as IFRA (Global), which governs safe usage levels. While this substance is not approved for flavor use, it is employed widely in cosmetic products to enhance olfactory appeal, especially in fine perfumes and personal care items. Its stability and scent longevity make it a useful compound for fragrance developers aiming to create refined floral compositions.

3-methyl-6-ethyl-5-octen-1-ol exhibits a moderate boiling point between 144 and 145°C at standard atmospheric pressure (760 mm Hg), which affects its evaporation rate in formulations. The vapor pressure at 25°C is low, approximately 0.005 mmHg, indicating limited volatility under ambient conditions. This alcohol is soluble in organic solvents such as alcohol but only sparingly soluble in water, with an estimated water solubility of about 69.47 mg/L at 25°C. Its estimated log P value of approximately 3.6 reflects significant lipophilicity, enhancing solubility in non-polar media. The flash point around 133°C (converted from 272°F) suggests safe handling at typical room temperatures but caution during elevated temperatures. These properties influence the incorporation and stability of the compound in fragrance and perfuming formulations.

(IUPAC):	Atomic Weights of the Elements 2011 (pdf)
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(IUPAC):	Periodic Table of the Elements
HMDB (The Human Metabolome Database):	Search
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Safety information

Hazards identification
Classification of the substance or mixture
GHS Classification in accordance with 29 CFR 1910 (OSHA HCS)
None found.
GHS Label elements, including precautionary statements
Pictogram
Hazard statement(s)
None found.
Precautionary statement(s)
None found.
Oral/Parenteral Toxicity:
Not determined
Dermal Toxicity:
Not determined
Inhalation Toxicity:
Not determined

Safety in use information

Category:
fragrance agents
RIFM Fragrance Material Safety Assessment: Search
IFRA Code of Practice Notification of the 49th Amendment to the IFRA Code of Practice
Recommendation for 3-methyl-6-ethyl-5-octen-1-ol flavor usage levels up to:
	not for flavor use.

Safety references

EPI System: View

AIDS Citations:Search

Cancer Citations:Search

Toxicology Citations:Search

EPA Substance Registry Services (TSCA):26330-64-3

EPA ACToR:Toxicology Data

EPA Substance Registry Services (SRS):Registry

Laboratory Chemical Safety Summary :117305

National Institute of Allergy and Infectious Diseases:Data

6-ethyl-3-methyloct-5-en-1-ol

Chemidplus:0026330643