Hydroxycitronellal diethyl acetal (CAS 7779-94-4) — Floral Top to Middle Note Fragrance Ingredient

ByThe Good Scents
Floral · Citrus

Hydroxycitronellal diethyl acetal

CAS 7779-94-4

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

What Is Hydroxycitronellal diethyl acetal?

Hydroxycitronellal diethyl acetal is a synthetic fragrance ingredient used in perfumes and scented products. It contributes a fresh, floral, and slightly citrusy aroma, often found in soaps, detergents, and fine fragrances. This ingredient is valued for its stability and ability to enhance floral compositions, making it a versatile tool for perfumers.

Safety Profile

GENERALLY SAFE
Generally safeUse with awarenessProfessional use
✓ Safe in regulated products
⚠ Check for individual sensitivity
CAS
7779-94-4
Formula
Mixture
MW
Variable
Odor Family
Floral · Citrus
Layer 1 · Enthusiast

What Does Hydroxycitronellal diethyl acetal Smell Like?

Hydroxycitronellal diethyl acetal opens with a bright, citrusy freshness reminiscent of lemon peel, quickly transitioning into a soft floral heart akin to lily of the valley. The dry-down reveals a subtle woody undertone, creating a clean, slightly sweet finish. Its aroma is airy and uplifting, perfect for springtime fragrances.

Scent Profile

In Famous Fragrances

Fragrance associations may not reflect actual formulations.

Chanel No. 5(Chanel, 1921)

Used to enhance the floral bouquet, adding a fresh, clean dimension to the iconic aldehydic composition.

Dior J'adore(Dior, 1999)

Contributes to the luminous floralcy, blending seamlessly with ylang-ylang and rose for a radiant effect.

Layer 2

Chemistry, Properties & Perfumer Guide

The Chemistry

Hydroxycitronellal diethyl acetal is a synthetic molecule derived from citronellal. It belongs to the acetal class, known for their stability and resistance to oxidation. This makes it particularly useful in formulations requiring longevity. The compound is typically synthesized through the acetalization of hydroxycitronellal with ethanol.

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 Fragrance1-5%Up to 10%Adds floral freshness
Soaps & Detergents0.1-1%Up to 3%Provides clean scent

Classic Accords

Tip: Use in floral compositions to add a clean, uplifting freshness.

Alternatives & Comparisons

1
Hydroxycitronellal CAS 107-75-5

Similar floral-citrus profile but less stable, suitable for short-lived formulations.

2
Lilial CAS 80-54-6

Offers a more intense floralcy but is restricted due to allergen potential.

Layer 3

Safety, Regulatory & Sustainability

⚠ Regulatory Disclaimer

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

IFRA Status

No current IFRA restrictions.

EU Allergen Declaration

Not listed as an EU allergen.

RIFM Assessment

Considered safe for use in current applications by RIFM.

Sustainability

As a synthetic ingredient, hydroxycitronellal diethyl acetal is not dependent on natural resources. Its production can be optimized for minimal environmental impact through green chemistry practices.

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References

  1. PubChem: Hydroxycitronellal diethyl acetal PubChem
  2. IFRA Standards Library IFRA

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

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