Spirodecane

What Spirodecane smells like

The Good Scents Company lists spirodecane (IFF) as 2-methyl-1,5-dioxaspiro[5.5]undecane and gives IFF's description as herbal with a thujone character; other suppliers it lists describe herbal, eucalyptus and woody notes with some thujone character, and camphor.

Leading note

Herbal

Clear facets

Thujone

Supporting facets

Eucalyptus, camphor

Faint facets

Woody

Character

Cool

• herbal
• thujone
• eucalyptus
• camphor
• woody

What makes Spirodecane distinctive

A wormwood-like herbal note from a synthetic ketal.

How Spirodecane is used

Used to give herbal, wormwood-like and camphoraceous effects.

Typical role: modifier (used in small amounts to change the character of a blend).

How Spirodecane differs from similar materials

Lavender Aldehyde

Lavender Aldehyde is lavender-herbal with cocoa and blueberry; Spirodecane is the thujone-like wormwood herb.

Armoise Oil

Armoise oil is the natural absinthe herb, sweet-green camphor with thujone's bitterness; Spirodecane is a synthetic ketal that gives a thujone-like herbal note.

Each difference compares the published descriptions of the two materials. Smell varies with grade, supplier and dilution; compare them side by side on blotters before substituting one for another.

Identity and classification

Type

Aroma chemical

Origin

Synthetic

Odour family

Aromatic / Woody

Note position

Top to heart note

Physical form at room temperature

Liquid

Also known as

2-Methyl-1,5-dioxaspiro[5.5]undecane

CAS number

6413-26-9

Molecular formula

C10H18O2

Molecular weight

170.25 g/mol

IUPAC name

4-methyl-1,5-dioxaspiro[5.5]undecane

The CAS number, formula and molecular weight are taken from PubChem compound 97842, whose own record lists this CAS number; checked 24 October 2026.

Safety and compliance

Hazard classification of the neat substance, as PubChem summarises it, read 26 October 2026. Companies notifying the ECHA C&L Inventory report it as not meeting the GHS hazard criteria (89 of 89 reports). Unless it is harmonised, this is the notifiers' own classification, not a binding one.

This page is general information, not a safety assessment or a specification. Confirm identity, composition, IFRA status and allergen content from your supplier's documents for the lot you hold.

Materials it works with

• Armoise Oil

  Essential oil · Aromatic / Green — herbal, bitter, camphoraceous, sweet

• Eucalyptus Oil

  Essential oil · Aromatic / Green — camphoraceous, cooling, medicinal, fresh

• Camphor

  Aroma chemical · Aromatic / Woody — camphoraceous, medicinal, cooling

Used in formulas and accords

Used in 4 published formulas

Spirodecane is an ingredient in 1 perfume formula and 3 accords in the Formula & Accord Library.

Community formulas

• Gasoline Accord

  Community Formula · Accord

• Hazelnut Accord

  Community Formula · Accord

• Tobacco Accord

  Community Formula · Accord

RUŌOD House Originals

Original compositions by RUŌOD House.

• Bracken Moon

  RUŌOD House Original

Further reading

• Aromatic Notes in Perfumery: Lavender, Sage, Rosemary and Mint

  The aromatic family for formulators: lavender, lavandin and spike, clary sage, rosemary, mint and basil — chemistry, chemotypes and EU allergen status.

Questions about Spirodecane

Sources

• PubChem — compound 97842, checked 24 October 2026.
• PubChem — GHS classification (the ECHA C&L Inventory notifications and any harmonised EU entry), read 26 October 2026.
• The Good Scents Company — spirodecane — odour database.
• PubChem — 2-methyl-1,5-dioxaspiro[5.5]undecane (CID 97842) — odour database.
• Olfactory profile: the RUŌOD Lab team's synthesis of the published descriptions above, reviewed 26 October 2026. Evidence: more than one published description. Classification and the short description: revision 1. Descriptions of odour are judgement, not measurement.