5,8-Methano-2H-1-benzopyran, 6-ethylideneoctahydro-, (4aalpha,5beta,7Z,8beta,8aalpha)- (CAS 85633-07-04) — Woody Base Note Fragrance Ingredient

ByThe Good Scents
Woody · Balsamic

5,8-Methano-2H-1-benzopyran, 6-ethylideneoctahydro-, (4aalpha,5beta,7Z,8beta,8aalpha)-

CAS 85633-07-04

Origin
synthetic
Note
Base
IFRA
Generally safe
Data as of: Apr 2026

What Is 5,8-Methano-2H-1-benzopyran, 6-ethylideneoctahydro-, (4aalpha,5beta,7Z,8beta,8aalpha)-?

5,8-Methano-2H-1-benzopyran is a synthetic fragrance ingredient used in modern perfumery for its unique woody-amber characteristics. It’s found in niche fragrances and some household products. This molecule matters because it offers perfumers a sustainable alternative to traditional ambergris-derived compounds, aligning with ethical sourcing trends while maintaining olfactory complexity.

Safety Profile

GENERALLY SAFE
Generally safeUse with awarenessProfessional use
✓ No major restrictions
⚠ Limited toxicity data available
CAS
85633-07-04
Formula
Mixture
MW
Variable
Odor Family
Woody · Balsamic
Layer 1 · Enthusiast

What Does 5,8-Methano-2H-1-benzopyran, 6-ethylideneoctahydro-, (4aalpha,5beta,7Z,8beta,8aalpha)- Smell Like?

This synthetic molecule opens with a crisp, slightly metallic woody character that evolves into a warm ambery depth. Like sunlight filtering through antique wooden furniture, it carries both dryness and resonance. Over time, it develops a subtle powdery texture reminiscent of vintage perfumes, with a lingering skin-scent quality that blends seamlessly with musks and vanillic notes.

Scent Profile
Layer 2

Chemistry, Properties & Perfumer Guide

The Chemistry

5,8-Methano-2H-1-benzopyran belongs to the benzopyran class of compounds, structurally featuring a fused bicyclic system. As a fully synthetic material, it’s produced through catalytic hydrogenation and cyclization reactions from petrochemical precursors. The methano bridge introduces conformational rigidity that contributes to its odor persistence. No natural sources have been identified for this specific stereochemistry.

Physical & Chemical Properties

Boiling PointNot available
DensityNot available

Perfumer Guide

Note Position
Base
Volatility
Low (8+ hours)
Blending
Good
ApplicationTypical %RangeNotes
Fine Fragrance1-3%Up to 5%Amber accord modifier
Functional Fragrance0.5-1%Up to 2%Fabric conditioner base

Classic Accords

Tip: Use with ionones to create subtle powder-woody effects.

Alternatives & Comparisons

1
Ambrox CAS 6790-58-5

When more pronounced ambery character is desired without woody facets.

2
Norlimbanol CAS 70788-30-6

For stronger woody impact with less amber sweetness.

Layer 3

Safety, Regulatory & Sustainability

⚠ Regulatory Disclaimer

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

IFRA Status

No current IFRA restrictions.

RIFM Assessment

Not currently evaluated by RIFM.

Sustainability

As a synthetic material, this compound avoids natural resource depletion issues. Production can be optimized for energy efficiency, though petrochemical sourcing remains environmentally impactful. Future green chemistry approaches may improve its sustainability profile.

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References

  1. PubChem Compound Summary CID N/A

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

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