In short
Oxane (2-methyl-4-propyl-1,3-oxathiane) is a sulphur-containing material with an intense tropical-fruit, passion-fruit note.
What Oxane smells like
Oxane (2-methyl-4-propyl-1,3-oxathiane) is extremely powerful, with a tropical green passion-fruit note and a grapefruit-like tartness. Distributors add sulphurous depth and a galbanum-like freshness; flavour chemistry adds sulphurous, catty and pulpy notes and identifies it as a key sulphur-containing aroma compound of yellow passion fruit. At higher concentrations the sulphurous notes dominate and hide the tropical character.
- Leading note
- Tropical passion fruit
- Clear facets
- Tart grapefruit
- Supporting facets
- Sulphurous, catty
- Faint facets
- Galbanum-like green
- Character
- Intense, tart, juicy, sulphurous
What makes Oxane distinctive
Passion fruit's sulphur: the tropical, tart juiciness that only sulphur compounds give, with a catty edge at strength.
Concentration and dilution
At higher concentrations the sulphurous notes dominate; the tropical fruit appears only in high dilution.
How Oxane is used
Used in traces for tropical, passion-fruit and grapefruit effects in fruity compositions and flavours.
Typical role: modifier (used in small amounts to change the character of a blend).
How Oxane differs from similar materials
- Grapefruit Mercaptan
- Grapefruit mercaptan is grapefruit juice itself; Oxane is passion fruit first, with a tart grapefruit side and a catty, galbanum-green edge.
- Paradisamide
- Paradisamide gives a lasting guava-grapefruit tropical note without sulphur; Oxane's tropical juiciness is sulphurous.
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 potent; work from high dilutions.
Identity and classification
- Type
- Aroma chemical
- Origin
- Synthetic
- Odour family
- Fruity / Green
- Note position
- Top note
- Physical form at room temperature
- Liquid
- Also known as
- 2-Methyl-4-propyl-1,3-oxathiane
- CAS number
- 67715-80-4
- Molecular formula
- C8H16OS
- Molecular weight
- 160.28 g/mol
- IUPAC name
- 2-methyl-4-propyl-1,3-oxathiane
The CAS number, formula and molecular weight are taken from PubChem compound 101010, whose own record lists this CAS number; checked 19 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 (1,320 of 1,499 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
-
Grapefruit Oil (Expressed)
Essential oil · Citrus / Fruity — citrus, bitter, juicy, sparkling
-
Blackcurrant Bud Absolute
Absolute · Fruity / Green — blackcurrant, green, sulphurous, fruity
Oxane is also suggested as a partner on the pages for 8-Mercapto-p-menthan-3-one, Buccoxime and Grapefruit Mercaptan.
Used in formulas and accords
Used in 1 published formula
Oxane is an ingredient in 1 perfume formula in the Formula & Accord Library.
RUŌOD House Originals
Original compositions by RUŌOD House.
Further reading
Questions about Oxane
Is Oxane natural or synthetic?
Oxane is synthetic — it is made by chemical synthesis.
What is the CAS number of Oxane?
67715-80-4. It was checked against PubChem on 19 October 2026.
Which published formulas use Oxane?
Oxane is used in 1 published formula in the RUŌOD Lab Formula & Accord Library: Guava Monsoon. Each is listed with a link under "Used in formulas and accords" on this page.
Sources
- PubChem — compound 101010, checked 19 October 2026.
- PubChem — GHS classification (the ECHA C&L Inventory notifications and any harmonised EU entry), read 26 October 2026.
- The Good Scents Company — oxane — odour database.
- Fraterworks — Oxane 50 TEC — distributor's description.
- FooDB — 2-methyl-4-propyl-1,3-oxathiane — 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.