isolongifolene ketone

Isolongifolene ketone, also known by synonyms such as isolongifolanone and ketone patchouli, is a bicyclic sesquiterpenoid ketone with the molecular formula C₁₅H₂₄O. This compound appears as a colorless to pale yellow liquid with a characteristic dry, woody, and earthy aroma that includes nuances of patchouli, cedar, tobacco, and amber. The odor is medium in strength and notably long-lasting, with substantivity reaching up to 240 hours at pure concentration. It is classified chemically under PubChem CID 90978. Typically sourced through synthetic routes, isolongifolene ketone is valued in fragrance chemistry as an important base note ingredient.

Isolongifolene ketone occurs naturally in plants such as Cordylandra pernambucensis but is primarily produced synthetically for commercial use. It is widely employed as a fragrance agent in perfumery for its woody, amber, and earthy scent profile. The compound is especially useful in compositions requiring dry woody, patchouli, and tobacco accords as well as in formulations aimed at replicating fir needle, sandalwood, and vetiver characteristics. Recognized under the IFRA (Global) Code of Practice, the recommended maximum usage level in fragrance concentrates is 15%. Its versatile scent character makes it a sought-after ingredient in fine fragrances and other perfuming applications.

Isolongifolene ketone has a molecular weight of approximately 220.36 g/mol and a formula of C₁₅H₂₄O. The compound exhibits a high lipophilicity with an estimated logP of 4.5, indicating good affinity for oily phases in formulations. It has a low vapor pressure of 0.003 mmHg at 25 °C, contributing to its long-lasting aromatic effect. The specific gravity ranges between 1.01 and 1.018 at 20 °C. Its flash point is around 201 °F (approximately 94 °C), denoting moderate volatility and flammability boundaries. Isolongifolene ketone is soluble in alcohol and slightly soluble in water (approximately 18.94 mg/L at 25 °C). Proper storage involves keeping the compound in a cool, dry place protected from heat and light to maintain stability over a shelf life of at least 24 months.

(IUPAC):	Atomic Weights of the Elements 2011 (pdf)
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tgsc:	Atomic Weights use for this web site
(IUPAC):	Periodic Table of the Elements
HMDB (The Human Metabolome Database):	Search
Export Tariff Code:	2914.29.0000
VCF-Online:	VCF Volatile Compounds in Food
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Safety information

European information :
Most important hazard(s):
Xi - Irritant
R 36/38 - Irritating to skin and eyes. S 02 - Keep out of the reach of children. S 24/25 - Avoid contact with skin and eyes. S 26 - In case of contact with eyes, rinse immediately with plenty of water and seek medical advice. S 36 - Wear suitable protective clothing.
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 isolongifolene ketone usage levels up to:
	15.0000 % in the fragrance concentrate.
Recommendation for isolongifolene ketone 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):23787-90-8

EPA ACToR:Toxicology Data

EPA Substance Registry Services (SRS):Registry

Laboratory Chemical Safety Summary :90978

National Institute of Allergy and Infectious Diseases:Data

WGK Germany:2

2,2,7,7-tetramethyltricyclo[6.2.1.01,6]undecan-5-one

Chemidplus:0023787908