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Acetyl cedrene is a liquid ketone used as a raw perfumery material, a single aroma molecule rather than a finished perfume. It is soluble in alcohol and insoluble in water. Its INCI name is Acetyl Cedrene and its EC number is 251-020-3.

Its IUPAC name is 1-[(1R,2R,5S,7R)-2,6,6,8-tetramethyl-9-tricyclo[5.3.1.01,5]undec-8-enyl]ethanone. Iso E Super is a different material, with the formula C₁₆H₂₆O, a molar mass of 234.38 g/mol and other CAS numbers, among them 54464-57-2.

Acetyl cedrene is entry 327 in Annex III to Regulation (EC) No 1223/2009 on cosmetic products. Its presence must be indicated in the list of ingredients when its concentration exceeds 0.001 % in leave-on products or 0.01 % in rinse-off products.

Chemistry and identification

PubChem lists it as compound 16220111 under the title acetylcedrene. The name used for it in Annex III is [3R-(3α,3aβ,7β,8aα)]-1-(2,3,4,7,8,8a-hexahydro-3,6,8,8-tetramethyl-1H-3a,7-methanoazulen-5-yl)ethan-1-one. The IFRA consultation on the 52nd Amendment gives a second CAS number for it, 68039-35-0, next to 32388-55-9, and spells its INCI name Acetylcedrene.

Comparison with Iso E Super

Iso E Super (OTNE) is a synthetic ketone fragrance with a woody odour, produced commercially by a Diels–Alder reaction. The commercial product comprises more than twenty isomeric ketones. The dominant beta isomer makes up most of the mixture yet is nearly odourless, and the characteristic scent comes from a minor constituent, the gamma isomer known as Arborone, which typically represents only a few percent of the mixture.

Cedar oil and cedrene

Cedrene is a sesquiterpene found in the essential oil of cedar. The two isomers present in the oil, α-cedrene and β-cedrene, differ in the position of a double bond, and cedrene is used in perfumes and fragrances to produce a woody scent. Cedrol is another component of cedar oil. All the cedarwood oils of commerce contain cedrol and cedrene in proportions that depend on the species. These compounds contribute to the odour of the oil and are valuable to the chemical industry for conversion to other derivatives with fragrance applications.

Cedar oil is an essential oil derived from various conifers, most of them in the pine or cypress families. The most important commercial oils are distilled from the wood of junipers and cypresses, both of the family Cupressaceae, rather than from true cedars. Texas cedarwood oil is derived primarily from Juniperus ashei and a second species. Ashe juniper is a drought-tolerant evergreen tree native from northeastern Mexico and the south-central United States to southern Missouri, with its largest stands in central Texas. Cedarwood oils each have a characteristic woody odour, which may change somewhat as the oil dries out.

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Related: Australian Blue Cypress · Cedar · Cedarwood · Cedrene · Cedrol · Cedryl Acetate · Cypress · False Cypress