5,8-Methano-2H-1-benzopyran, 6-ethylideneoctahydro-, (4a,5,6E,8,8a)- (CAS 85700-02-03) — Woody Middle to base Note Fragrance Ingredient

ByThe Good Scents
Woody · Balsamic

5,_8-_Methano-_2H-_1-_benzopyran, 6-_ethylideneoctahydro-_, (4a_,_5_,_6E,_8_,_8a_)_-

CAS 85700-02-03

Origin
synthetic
Note
Middle to base
IFRA
Use with awareness
Data as of: Apr 2026

What Is 5,_8-_Methano-_2H-_1-_benzopyran, 6-_ethylideneoctahydro-_, (4a_,_5_,_6E,_8_,_8a_)_-?

This synthetic fragrance compound is a specialized ingredient used in modern perfumery to create unique olfactory effects. It’s typically found in niche and avant-garde fragrances where unconventional scent profiles are desired. While not commonly encountered in everyday products, it represents perfumers’ ability to engineer novel scent molecules that push creative boundaries.

Safety Profile

USE WITH AWARENESS
Generally safeUse with awarenessProfessional use
⚠ Limited safety data available
⚠ Professional handling recommended
CAS
85700-02-03
Formula
Mixture
MW
Variable
Odor Family
Woody · Balsamic
Layer 1 · Enthusiast

What Does 5,_8-_Methano-_2H-_1-_benzopyran, 6-_ethylideneoctahydro-_, (4a_,_5_,_6E,_8_,_8a_)_- Smell Like?

This synthetic molecule offers an intriguing olfactory profile that evolves from initial sharp, almost metallic top notes to a complex heart with woody-ambery undertones. The dry-down reveals subtle powdery facets reminiscent of vintage perfumes, yet maintains a modern synthetic edge. The scent carries an unusual duality – simultaneously clean yet animalic, with a faint camphoraceous quality that adds dimension to fragrance compositions.

Scent Profile
Layer 2

Chemistry, Properties & Perfumer Guide

The Chemistry

This synthetic compound belongs to the benzopyran class, characterized by its methano-bridged bicyclic structure with an ethylidene substituent. The (4a,5,6E,8,8a) stereochemistry suggests specific spatial arrangement that likely influences its odor characteristics. As a completely synthetic material, it’s produced through multi-step organic synthesis, possibly involving Diels-Alder reactions or other cyclization strategies to construct the complex ring system. The exact synthesis route remains proprietary in the fragrance industry.

Physical & Chemical Properties

Perfumer Guide

Note Position
Middle to base
Volatility
Moderate (2-6 hours)
Blending
Specialized
ApplicationTypical %RangeNotes
Fine Fragrance0.1-0.5%Up to 1%Used as an accent note
Functional FragranceTrace amountsUp to 0.1%Very limited use

Classic Accords

Tip: Use sparingly as an enhancer for woody-amber bases where a subtle metallic edge is desired.

Alternatives & Comparisons

1
Ambroxan CAS 6790-58-5

Provides similar ambery-woody effects with better safety profile and more extensive usage history in perfumery.

Layer 3

Safety, Regulatory & Sustainability

⚠ Regulatory Disclaimer

General reference only. Consult current IFRA Standards Library before formulating.

IFRA Status

No specific IFRA restrictions found, but limited safety data suggests conservative usage.

RIFM Assessment

No RIFM assessment publicly available for this compound.

Sustainability

As a synthetic material, this compound’s environmental impact depends on production methods and energy inputs. Being produced in small quantities for niche applications, its overall ecological footprint is limited but should be considered against performance benefits. The lack of natural sourcing makes it independent of agricultural constraints but reliant on petrochemical feedstocks.

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References

    Data: PubChem (NIH), PubMed, RIFM, IFRA. Last reviewed: Apr 2026.

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