Dynascone

In short

Dynascone is a Firmenich ketone with an intense galbanum-like green note. A trace gives a fresh, sharp green opening without the cost of galbanum oil.

What Dynascone smells like

Dynascone is one of the most powerful of the galbanum-type materials. Firmenich's own description is green, fruity, pungent and floral: an extremely powerful and diffusive ingredient reminiscent of galbanum, with a green pineapple and hyacinth character. The hyacinth note is what separates it from the other green-fruity materials, giving its greenness a floral tone. Firmenich's related Neobutenone is described as greener, stronger, less fruity and more galbanum-like, which places Dynascone on the fruitier, more floral side of the pair.

Leading note: Green galbanum
Supporting facets: Green pineapple, hyacinth
Character: Green, pungent, sharp, diffusive

What makes Dynascone distinctive

The hyacinth. Many materials combine galbanum-green with pineapple, but Dynascone's manufacturer adds a floral hyacinth character, and its power and diffusion are exceptional even among these strong materials — its dose has to be controlled carefully.

How Dynascone is used

Firmenich describes it as used in all types of fragrance for green, floral and fruity effects. It gives an intense galbanum-green opening in very small amounts, and its hyacinth facet makes it a natural partner for green florals.

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

How Dynascone differs from similar materials

Allyl Amyl Glycolate: Allyl amyl glycolate is fruitier and more metallic, with no floral side; Dynascone adds a hyacinth-like floral note and is more powerful and diffusive.
Cyclogalbanate: Cyclogalbanate is herbal and cool-spicy; Dynascone is floral (hyacinth) and more pungent.
Galbanum Oil: Galbanum oil is the natural, resinous green Dynascone recalls; Dynascone is far more powerful and adds hyacinth and green pineapple.

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.

Formulation considerations

Extremely strong; dose from dilution. Covered by an IFRA Standard.

Identity and classification

Type: Aroma chemical
Origin: Synthetic
Odour family: Green / Woody
Note position: Top note
Physical form at room temperature: Liquid
CAS number: 56973-85-4
Molecular formula: C13H20O
Molecular weight: 192.3 g/mol
IUPAC name: 1-(5,5-dimethylcyclohexen-1-yl)pent-4-en-1-one

The CAS number, formula and molecular weight are taken from PubChem compound 92606, whose own record lists this CAS number; checked 19 October 2026.

Safety and compliance

The IFRA Standards Library lists a Standard covering Dynascone:

"1-(5,5-Dimethyl-1-cyclohexen-1-yl)pent-4-en-1-one" — Restriction, 49th Amendment, published 2020-01

Limits differ by product category and are set out in the Standard itself; this page does not reproduce them. The list above reflects the library as read on 19 October 2026.

Hazard classification of the neat substance, as PubChem summarises it, read 26 October 2026. Companies notifying the ECHA C&L Inventory classify it (1,738 reports): H411 toxic to aquatic life with long lasting effects (10.1% of 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

Galbanum Oil
Essential oil · Green / Resinous — green, sharp, bitter, resinous
Allyl Amyl Glycolate
Aroma chemical · Green / Fruity — green, pineapple, galbanum, fruity
cis-3-Hexenol
Aroma chemical · Green / Fruity — green, cut grass, leafy, fresh

Used in formulas and accords

Used in 1 published formula

Dynascone is an ingredient in 1 accord in the Formula & Accord Library.

Hyacinth Accord
Community Formula · Accord

Questions about Dynascone

Is Dynascone natural or synthetic?

Dynascone is synthetic — it is made by chemical synthesis.

What is the CAS number of Dynascone?

56973-85-4. It was checked against PubChem on 19 October 2026.

Which published formulas use Dynascone?

Dynascone is used in 1 published formula in the RUŌOD Lab Formula & Accord Library: Hyacinth Accord. Each is listed with a link under "Used in formulas and accords" on this page.

Is Dynascone covered by an IFRA Standard?

Yes. The IFRA Standards Library lists a Standard covering it: "1-(5,5-Dimethyl-1-cyclohexen-1-yl)pent-4-en-1-one" — Restriction, 49th Amendment. The limits depend on the product category; read the Standard itself before formulating.

Sources

PubChem — compound 92606, checked 19 October 2026.
PubChem — GHS classification (the ECHA C&L Inventory notifications and any harmonised EU entry), read 26 October 2026.
IFRA — Standards Library, read 19 October 2026.
Firmenich — DYNASCONE® marketing sheet — manufacturer's description.
dsm-firmenich — Dynascone® PE 939745 — manufacturer's description.
The Good Scents Company — Dynascone (with Firmenich's comparison to Neobutenone) — odour database.
Olfactory profile: the RUŌOD Lab team's synthesis of the published descriptions above, reviewed 20 October 2026. Evidence: several independent published descriptions, which agree. Classification and the short description: revision 2. Descriptions of odour are judgement, not measurement.