Acetic acid, anhydride, reaction products with (1S,3aR,4S,8aS)-decahydro-4,8,8-trimethyl-9-methylene-1,4-methanoazulene (CAS 71549-77-4) — Woody Middle Note Fragrance Ingredient
Acetic acid, anhydride, reaction products with (1S,3aR,4S,8aS)-decahydro-4,8,8-trimethyl-9-methylene-1,4-methanoazulene
CAS 71549-77-4
What Is Acetic acid, anhydride, reaction products with (1S,3aR,4S,8aS)-decahydro-4,8,8-trimethyl-9-methylene-1,4-methanoazulene?
This synthetic compound is a specialized fragrance ingredient derived from acetic acid and a complex terpene structure. It’s used in niche perfumery to create unique woody-amber effects. While not commonly encountered in everyday products, it offers perfumers a sophisticated tool for crafting distinctive accords.
Safety Profile
USE WITH AWARENESSWhat Does Acetic acid, anhydride, reaction products with (1S,3aR,4S,8aS)-decahydro-4,8,8-trimethyl-9-methylene-1,4-methanoazulene Smell Like?
The scent profile presents an intriguing duality – sharp acetic top notes quickly give way to a deep, resinous heart reminiscent of aged woods and fossilized amber. The dry-down reveals a complex interplay between chemical precision and natural warmth, with subtle camphoraceous undertones that linger close to the skin.
Chemistry, Properties & Perfumer Guide
The Chemistry
This compound results from the reaction of acetic anhydride with a modified decahydroazulene structure, creating an ester-like derivative. The synthesis involves careful control of reaction conditions to preserve the stereochemistry of the terpene core. The product exhibits both the reactivity of acetic derivatives and the stability of fused ring systems.
Physical & Chemical Properties
| Appearance | Clear viscous liquid |
|---|---|
| Solubility | Soluble in alcohol |
Perfumer Guide
| Application | Typical % | Range | Notes |
|---|---|---|---|
| Fine Fragrance | 0.5-2% | Up to 5% | Used as woody-amber modifier |
| Functional Fragrance | 0.1-0.5% | Up to 1% | Limited use due to potency |
Classic Accords
Tip: Use sparingly in woody bases to add depth without overwhelming other notes.
Alternatives & Comparisons
More widely available amber alternative with similar longevity but less chemical character.
Woody-amber material with better safety profile and more predictable performance.
Safety, Regulatory & Sustainability
⚠ Regulatory Disclaimer
General reference only. Consult current IFRA Standards Library before formulating.
IFRA Status
No specific IFRA restrictions. General guidelines for acetic acid derivatives apply.
GHS Classification
RIFM Assessment
Not currently evaluated by RIFM. Use with caution pending further safety data.
Sustainability
As a fully synthetic material, production avoids natural resource depletion. However, the multi-step synthesis requires careful solvent management and energy input. Future green chemistry approaches may improve the environmental profile.
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