Dihydropinene (CAS 473-55-2) — Woody Top to middle Note Fragrance Ingredient

ByThe Good Scents
Woody · Green

Dihydropinene

CAS 473-55-2

Origin
synthetic
Note
Top to middle
IFRA
Generally safe
Data as of: Apr 2026

What Is Dihydropinene?

Dihydropinene is a synthetic fragrance ingredient used in modern perfumery to add woody, pine-like freshness. It’s found in air fresheners, masculine colognes, and cleaning products. This versatile material helps create crisp, outdoorsy scents that evoke forest walks and alpine freshness.

Safety Profile

GENERALLY SAFE
Generally safeUse with awarenessProfessional use
✓ No major restrictions
⚠ Use standard handling precautions
CAS
473-55-2
Formula
Mixture
MW
Variable
Odor Family
Woody · Green
Layer 1 · Enthusiast

What Does Dihydropinene Smell Like?

Dihydropinene delivers a sharp, clean pine needle character with camphoraceous undertones. The initial burst is intensely fresh – like crushed pine cones and winter air. As it evolves, reveals a smoother woody heart with subtle citrusy facets. The dry-down leaves a subtle, clean woody trace that blends well with other forest notes.

Scent Profile

In Famous Fragrances

Fragrance associations may not reflect actual formulations.

Pino Silvestre(Vidal, 1955)

Used as a key pine note to create the authentic Italian forest accord, blending with juniper and citrus for a classic barbershop freshness.

Sylvaine Delacourte(Vanille, 2017)

Provides crisp contrast to vanilla base notes, creating an unusual forest-gourmand juxtaposition in this niche composition.

Layer 2

2D Molecular Structure

Pinane

SMILES: CC1CCC2CC1C2(C)C

Chemistry, Properties & Perfumer Guide

The Chemistry

Dihydropinene is a bicyclic monoterpene derivative, structurally related to pinene but with reduced double bonds. It’s typically synthesized through hydrogenation of pinene precursors. The saturated structure makes it more stable than pinene while retaining similar olfactory characteristics. Commercial production often uses turpentine-derived feedstocks.

Physical & Chemical Properties

Boiling PointNot specified
DensityNot specified

Perfumer Guide

Note Position
Top to middle
Volatility
Medium (2-4 hours)
Blending
Good
ApplicationTypical %RangeNotes
Fine Fragrance1-3%Up to 5%Forest accords, masculine fougères
Functional Fragrances3-8%Up to 15%Cleaning products, air fresheners

Classic Accords

+ Cedarwood + Bergamot = Alpine freshness + Eucalyptus + Mint = Cooling forest

Tip: Use to add crispness to woody bases without overwhelming citrus top notes.

Alternatives & Comparisons

1
Alpha-Pinene CAS 80-56-8

More volatile with sharper pine character, but less stable in formulations.

2
Terpinolene CAS 586-62-9

Offers similar woody freshness but with floral citrus nuances.

Layer 3

Safety, Regulatory & Sustainability

⚠ Regulatory Disclaimer

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

IFRA Status

No IFRA restrictions currently apply to dihydropinene.

RIFM Assessment

Not currently assessed by RIFM, but structurally similar compounds have good safety profiles.

Sustainability

As a synthetic material, dihydropinene production doesn’t impact natural pine forests. Most commercial production uses byproducts from paper industry turpentine, making it a sustainable use of existing waste streams. Carbon footprint depends on hydrogenation process energy inputs.

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References

  1. Bauer et al. (2001). Common Fragrance and Flavor Materials. Wiley-VCH.
  2. Turpentine Derivatives Technical Report

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

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Ingredient Data Sheet

CAS 473-55-2

Physical Properties

Molecular Weight138.25 g/mol🔬 PubChem
LogP (Octanol-Water)3.9🔬 PubChem
Boiling Point151.1 °C🔬 EPA CompTox
Vapor Pressure2 mmHg @ 25°C📊 OPERA
Flash Point40 °C🔬 EPA CompTox
Involatility Index0.1833💻 Calculated
log Kp (skin permeability)-0.774💻 Calculated
SMILESCC1CCC2CC1C2(C)C🔬 PubChem

Volatility & Performance

Fragrance NoteTop💻 Calculated
Volatility ClassModerate💻 Calculated
Persistence Score0.5 / 5💻 Calculated

Odor & Flavor

Primary Descriptorsgreenpinewoody• leffingwell
Data Sources & Attribution
Physical 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.

Physicochemical Properties

DTXSID: DTXSID7025922

Physical Properties

Molecular Weight 138.254 g/mol🔬 EPA CompTox
Density 0.847 g/cm^3🔬 EPA CTX
Boiling Point 160.037 °C🔬 EPA CTX
Melting Point -51.5 °C🔬 EPA CTX
Flash Point 40.075 °C🔬 EPA CTX
Refractive Index 1.455 Dimensionless📊 OPERA
Molar Volume 163.619 cm^3/mol📊 OPERA

Partition & Solubility

LogP (Octanol-Water) 4.403 Log10 unitless📊 OPERA
LogD (pH 5.5) 4.403 Log10 unitless📊 OPERA
LogD (pH 7.4) 4.403 Log10 unitless📊 OPERA
LogKoa (Octanol-Air) 4.56 Log10 unitless📊 OPERA
Water Solubility 0 mol/L📊 OPERA
Henry's Law Constant 0.059 atm-m3/mole📊 OPERA

Transport Properties

Vapor Pressure 3.329 mmHg🔬 EPA CTX
Viscosity 2.052 cP📊 OPERA
Surface Tension 27.075 dyn/cm📊 OPERA
Thermal Conductivity 104.417 mW/(m*K)📊 OPERA

Molecular Descriptors

Topological Polar Surface Area 0 Ų💻 Computed
H-Bond Donors 0 count💻 Computed
H-Bond Acceptors 0 count💻 Computed
Rotatable Bonds 0 count💻 Computed
Aromatic Rings 0 count💻 Computed
Molar Refractivity 44.364 cm^3/mol📊 OPERA
Polarizability 17.587 Å^3📊 OPERA

Data Sources:

🔬 EPA Experimental data from U.S. EPA CompTox Chemicals Dashboard & CTX APIs. 📊 OPERA Predicted using EPA's OPERA QSAR models. 💻 Computed Calculated from SMILES using RDKit.

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