4,5-Dihydro-3(2H)thiophenone (CAS 1003-04-09) — Balsamic Middle Note Fragrance Ingredient
4,5-Dihydro-3(2H)thiophenone
CAS 1003-04-09
What Is 4,5-Dihydro-3(2H)thiophenone?
4,5-Dihydro-3(2H)thiophenone is a synthetic fragrance ingredient occasionally used in specialty perfumery. It’s found in certain niche fragrances where unique sulfurous notes are desired. This compound offers perfumers a way to add complex, savory nuances that can’t be achieved with more common ingredients. Its distinctive character makes it valuable for creating unconventional accords.
Safety Profile
USE WITH AWARENESSWhat Does 4,5-Dihydro-3(2H)thiophenone Smell Like?
This sulfur-containing compound presents a complex olfactory profile that evolves dramatically from application to dry-down. Initially, it bursts with a pungent, almost roasted meat-like quality, reminiscent of searing meat on a hot grill. As it develops, the sulfurous intensity mellows into a savory, brothy umami character with subtle mushroom undertones. The final dry-down reveals a lingering, warm leather-like nuance that adds depth and intrigue to fragrance compositions. Its transformative nature makes it particularly useful for adding unexpected savory facets to otherwise sweet or floral compositions.
Chemistry, Properties & Perfumer Guide
The Chemistry
4,5-Dihydro-3(2H)thiophenone belongs to the class of cyclic thioethers, characterized by a sulfur atom incorporated into a five-membered ring structure. The compound is purely synthetic, typically produced through controlled oxidation of corresponding thioethers or via cyclization reactions of sulfur-containing precursors. Its molecular structure features significant electron density around the sulfur atom, which contributes to both its distinctive odor profile and reactivity. The saturated ring system provides stability while allowing for controlled release of the sulfurous character during fragrance evaporation.
Physical & Chemical Properties
Perfumer Guide
| Application | Typical % | Range | Notes |
|---|---|---|---|
| Fine Fragrance | 0.1-0.5% | Up to 1% | Used as trace modifier |
| Functional Fragrance | 0.05-0.2% | Up to 0.5% | For savory effects |
Classic Accords
Tip: Use in minuscule quantities to add savory complexity without overwhelming other notes.
Alternatives & Comparisons
Offers similar sulfurous character but with more pronounced tropical fruit nuances, useful when a brighter effect is desired.
Provides a meatier, more roasted character for applications requiring intense savory notes.
Safety, Regulatory & Sustainability
⚠ Regulatory Disclaimer
General reference only. Consult current IFRA Standards Library before formulating.
IFRA Status
No specific IFRA restrictions. General guidelines for sulfur compounds apply.
RIFM Assessment
Not currently evaluated by RIFM. Use recommended at low levels based on structural analogs.
Sustainability
As a synthetic material, 4,5-Dihydro-3(2H)thiophenone’s environmental impact is limited to manufacturing processes. Being used in extremely low concentrations reduces its overall footprint. The compound is not known to bioaccumulate and breaks down readily in environmental conditions.
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