5-Hydroxy-7-decenoic acid delta-lactone (CAS 25524-95-2) — Sweet Heart Note Fragrance Ingredient

ByThe Good Scents
Sweet · Floral

5-Hydroxy-7-decenoic acid delta-lactone

CAS 25524-95-2

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

What Is 5-Hydroxy-7-decenoic acid delta-lactone?

5-Hydroxy-7-decenoic acid delta-lactone is a synthetic fragrance ingredient primarily used in perfumery. It is not commonly encountered in everyday products but may appear in niche or artisanal fragrances. This lactone contributes unique olfactory characteristics that are valued by perfumers for creating complex scent profiles.

Safety Profile

GENERALLY SAFE
Generally safeUse with awarenessProfessional use
✓ No major safety concerns reported
⚠ Limited safety data available
CAS
25524-95-2
Formula
Mixture
MW
Variable
Odor Family
Sweet · Floral
Layer 1 · Enthusiast

What Does 5-Hydroxy-7-decenoic acid delta-lactone Smell Like?

This lactone exhibits a nuanced olfactory profile, blending creamy, lactonic facets with subtle fruity undertones. The scent evolves from a fresh, slightly green opening to a warm, musky dry-down. Its character is reminiscent of ripe peaches with a hint of coconut, making it versatile in both floral and gourmand compositions.

Scent Profile
Layer 2

2D Molecular Structure

Tetrahydro-6-(2Z)-2-penten-1-yl-2H-pyran-2-one

SMILES: CC\C=C/CC1CCCC(=O)O1

Chemistry, Properties & Perfumer Guide

The Chemistry

5-Hydroxy-7-decenoic acid delta-lactone is a synthetic lactone belonging to the class of unsaturated lactones. It is not found in nature and is typically synthesized through chemical processes involving hydroxy acids. The molecule features a delta-lactone ring structure, which contributes to its unique olfactory properties.

Physical & Chemical Properties

Boiling PointNot available
DensityNot available

Perfumer Guide

Note Position
Heart
Volatility
Medium (2-4 hours)
Blending
Good
ApplicationTypical %RangeNotes
Fine Fragrance0.5-2%Up to 5%Adds creamy, fruity nuances

Classic Accords

Tip: Use sparingly to avoid overpowering other notes.

Alternatives & Comparisons

1
Gamma-Decalactone CAS 706-14-9

A more common lactone with similar fruity, creamy characteristics.

Layer 3

Safety, Regulatory & Sustainability

⚠ Regulatory Disclaimer

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

IFRA Status

No IFRA restrictions currently apply.

RIFM Assessment

No RIFM assessment available.

Sustainability

As a synthetic ingredient, this lactone does not rely on natural resources. Its production can be optimized for minimal environmental impact through green chemistry practices.

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References

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

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    Physicochemical Properties

    DTXSID: DTXSID30904360

    Physical Properties

    Molecular Weight 168.236 g/mol🔬 EPA CompTox
    Density 0.973 g/cm^3📊 OPERA
    Boiling Point 265.539 °C📊 OPERA
    Melting Point 1.332 °C📊 OPERA
    Flash Point 118.208 °C📊 OPERA
    Refractive Index 1.463 Dimensionless📊 OPERA
    Molar Volume 174.702 cm^3/mol📊 OPERA

    Partition & Solubility

    LogP (Octanol-Water) 2.229 Log10 unitless📊 OPERA
    LogD (pH 5.5) 2.229 Log10 unitless📊 OPERA
    LogD (pH 7.4) 2.229 Log10 unitless📊 OPERA
    LogKoa (Octanol-Air) 5.79 Log10 unitless📊 OPERA
    Water Solubility 0.011 mol/L📊 OPERA
    Henry's Law Constant 0 atm-m3/mole📊 OPERA

    Transport Properties

    Vapor Pressure 0.01 mmHg📊 OPERA
    Viscosity 2.574 cP📊 OPERA
    Surface Tension 30.947 dyn/cm📊 OPERA

    Molecular Descriptors

    Topological Polar Surface Area 26.3 Ų💻 Computed
    H-Bond Donors 0 count💻 Computed
    H-Bond Acceptors 2 count💻 Computed
    Rotatable Bonds 3 count💻 Computed
    Aromatic Rings 0 count💻 Computed
    Molar Refractivity 48.077 cm^3/mol📊 OPERA
    Polarizability 19.059 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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