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Iso E Super

1-(2,3,8,8-Tetramethyl-1,2,3,4,5,6,7,8-octahydronaphthalen-2-yl)ethan-1-one

Iso E Super, Orbitone, Boisvelone, OTNE, Tetramethyl acetyloctahydronaphthalenes

Bicyclic ketone · C₁₆H₂₆O

Chemical structure of Iso E Super
2D structure PubChem / NCI CIR

Chemical info

CAS number CAS
54464-57-2
Molecular formula
C₁₆H₂₆O
Molecular weight
234.38 g/mol
Introduced
1973 · IFF
Origin
Synthetic
Odor family
Woody
Note
Base
Aroma
Smooth dry wood with an ambery, velvety feel, very transparent; many people perceive it faintly, yet it makes surrounding notes radiate.

History

Iso E Super was developed and patented by IFF in the early 1970s. The commercial product is an isomer mixture; a minor isomer with the strongest odor, sometimes called Arborone, contributes much of the strength.

It became one of the most used synthetic materials in modern perfumery, with some formulas using it at tens of percent.

In perfumery

Iso E Super is used to add transparency, radiance and smooth wood to almost every fragrance family. It pairs well with ambroxide, hedione and musks. Maximum levels depend on the IFRA Standard for each product category.

Connections

Evokescedarwood

Regulatory status

Skin sensitizer · IFRA restricted · EU listed allergen
IFRA 51
Restriction: IFRA Standard for OTNE, published 2020; limits by product category.
EU allergen 2023/1545
Tetramethyl acetyloctahydronaphthalenes is on the added allergen list; must be named above 0.001% (leave-on) or 0.01% (rinse-off).

Sources

  1. NCI/CADD Chemical Identifier Resolver, CAS 54464-57-2 (formula, names)
  2. IFRA Standards, 51st Amendment: Index of IFRA Standards (notified 30 June 2023)
  3. Commission Regulation (EU) 2023/1545 amending Reg. (EC) 1223/2009 as regards labelling of fragrance allergens
  4. Cosmeservice, list of the 56 entries added by Regulation (EU) 2023/1545
  5. Sell C.S. (ed.) The Chemistry of Fragrances: From Perfumer to Consumer, 2nd ed., Royal Society of Chemistry 2006
  6. The Good Scents Company Information System, material entries
  7. IFF patent by J. B. Hall and J. M. Sanders (filed 1973, granted 1975), summarised in Tetramethyl acetyloctahydronaphthalenes history