Cassiffix

In short

Cassiffix is an IFF oxabicyclooctane ether with a blackcurrant (cassis) odour and no sulphur note. It gives the green-fruity side of cassis without the catty mercaptans.

What Cassiffix smells like

Fraterworks describes Cassiffix as a bright, sparkling, green-fruity blackcurrant with herbal undertones, delivering a clean, non-sulphurous cassis note that lasts a day on a strip. Parfumo calls it a powerful, diffusive fruity-green note with a clear cassis character free of sulphur facets. Its origin, as told by IFF, was a search for amber ethers on a campholenic backbone that produced a cassis odour instead.

Leading note: Blackcurrant
Clear facets: Green
Supporting facets: Herbal, fruity
Character: Clean, sparkling, diffusive

What makes Cassiffix distinctive

Cassis without sulphur: the green berry note without the catty, mercaptan side of the bud.

How Cassiffix is used

Used where a cassis effect is wanted without sulphurous materials.

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

How Cassiffix differs from similar materials

Blackcurrant Bud Absolute: Blackcurrant bud absolute has the green, fruity and sulphurous catty note of cassis buds; Cassiffix keeps the green-fruity cassis and drops the sulphur.
Buchu Oil: Buchu oil gets its blackcurrant note from sulphur compounds, over a minty, camphoraceous herb.

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

Sources list more than one CAS number for it (139539-66-5, 139539-67-6, 426218-78-2); this record carries the one supplier specifications use.

Identity and classification

Type: Aroma chemical
Origin: Synthetic
Odour family: Fruity / Green
Note position: Top to heart note
Physical form at room temperature: Liquid
CAS number: 139539-66-5
Molecular formula: C16H26O
Molecular weight: 234.38 g/mol
IUPAC name: 5-methyl-1-(2,2,3-trimethylcyclopent-3-en-1-yl)-6-oxabicyclo[3.2.1]octane

The CAS number, formula and molecular weight are taken from PubChem compound 57483301, whose own record lists this CAS number; checked 24 October 2026.

Safety and compliance

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

Blackcurrant Bud Absolute
Absolute · Fruity / Green — blackcurrant, green, sulphurous, fruity
8-Mercapto-p-menthan-3-one
Aroma chemical · Fruity / Green — blackcurrant, buchu, sulfurous, fruity
cis-3-Hexenol
Aroma chemical · Green / Fruity — green, cut grass, leafy, fresh

Cassiffix is also suggested as a partner on the pages for Buchu Oil and Paradisamide.

Used in formulas and accords

Used in 5 published formulas

Cassiffix is an ingredient in 2 perfume formulas and 3 accords in the Formula & Accord Library.

Community formulas

Champagne Accord
Community Formula · Accord · listed as “Cassifix”
Pomegranate Accord
Community Formula · Accord · listed as “Cassifix”
Tomato Leaf Accord
Community Formula · Accord · listed as “Cassifix”

RUŌOD House Originals

Original compositions by RUŌOD House.

Blackcurrant Signal
RUŌOD House Original · listed as “Cassiffix 10% DPG”, at 10% in DPG
Guava Monsoon
RUŌOD House Original · listed as “Cassiffix 10% DPG”, at 10% in DPG

Questions about Cassiffix

Is Cassiffix natural or synthetic?

Cassiffix is synthetic — it is made by chemical synthesis.

What is the CAS number of Cassiffix?

139539-66-5. It was checked against PubChem on 24 October 2026.

Which published formulas use Cassiffix?

Cassiffix is used in 5 published formulas in the RUŌOD Lab Formula & Accord Library, including Blackcurrant Signal, Champagne Accord and Guava Monsoon. Each is listed with a link under "Used in formulas and accords" on this page.

Sources

PubChem — compound 57483301, checked 24 October 2026.
Fraterworks — Cassiffix — distributor's description.
Parfumo — Cassiffix — published perfumery reference.
Wikipedia — Cassiffix — published perfumery reference.
Olfactory profile: the RUŌOD Lab team's synthesis of the published descriptions above, reviewed 24 October 2026. Evidence: more than one published description. Classification and the short description: revision 1. Descriptions of odour are judgement, not measurement.