2,3-Dihydro-1,1-dimethyl-1H-indene-ar-propanal (CAS 300371-33-9) — Woody Middle to base Note Fragrance Ingredient
2,3-Dihydro-1,1-dimethyl-1H-indene-ar-propanal
CAS 300371-33-9
What Is 2,3-Dihydro-1,1-dimethyl-1H-indene-ar-propanal?
2,3-Dihydro-1,1-dimethyl-1H-indene-ar-propanal is a synthetic fragrance ingredient used in modern perfumery to add woody and amber nuances. It’s often found in masculine scents and woody-amber bases. This molecule contributes to long-lasting fragrance effects, particularly in designer colognes where warm dry-downs are desired.
Safety Profile
USE WITH AWARENESSWhat Does 2,3-Dihydro-1,1-dimethyl-1H-indene-ar-propanal Smell Like?
This synthetic aldehyde opens with a crisp, slightly metallic edge reminiscent of fresh-cut aluminum foil, quickly warming into a complex woody-amber character. The dry-down reveals a sophisticated interplay between dry cedar shavings and the faint sweetness of aged cognac barrels, with a subtle animalic undertone that never dominates but provides depth. In dilution, it behaves like sun-warmed driftwood – retaining structural integrity while acquiring a polished smoothness.
Chemistry, Properties & Perfumer Guide
The Chemistry
2,3-Dihydro-1,1-dimethyl-1H-indene-ar-propanal belongs to the class of indane derivatives, structurally featuring a fused aromatic and aliphatic system. The molecular architecture combines an indane core with a propanal sidechain, creating unique conformational constraints that influence its odor profile. Synthesis typically involves Friedel-Crafts alkylation followed by controlled oxidation to introduce the aldehyde functionality. The stereochemistry at the propanal position significantly impacts odor intensity, with the (R)-enantiomer displaying greater olfactory potency.
Physical & Chemical Properties
Perfumer Guide
| Application | Typical % | Range | Notes |
|---|---|---|---|
| Fine Fragrance | 0.5-3% | Up to 5% | Base note modifier |
| Functional Fragrance | 0.1-1% | Up to 2% | Amber accord component |
Classic Accords
Tip: Use with ionones to soften metallic top notes while maintaining projection.
Alternatives & Comparisons
Safety, Regulatory & Sustainability
⚠ Regulatory Disclaimer
General reference only. Consult current IFRA Standards Library before formulating.
IFRA Status
No current IFRA restrictions. Listed on IFRA Transparency List.
RIFM Assessment
Under evaluation by RIFM as of 2023.
Sustainability
As a synthetic material, this ingredient avoids natural resource depletion but requires petrochemical feedstocks. Manufacturing typically involves solvent-based processes requiring proper waste management. The molecular efficiency (high odor impact per gram) reduces environmental load compared to some natural alternatives.
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Ingredient Data Sheet
CAS 300371-33-9Physical data: PubChem (NIH/NLM), U.S. EPA CompTox Dashboard, EPA OPERA models, RDKit. Odor & flavor: Arctander (Perfume & Flavor Chemicals), Fenaroli's Handbook of Flavor Ingredients, Leffingwell. Thresholds: van Gemert (Compilations of Odour Threshold Values). Regulatory: IFRA Standards 51st, FEMA GRAS. Trade names: Surburg (Common Fragrance & Flavor Materials). All data compiled and cross-referenced for perfumertools.com.
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