Aldehyde C11 Undecylenic: Fragrance Ingredient Overview

Introduction

Aldehyde C11 Undecylenic is a well-known aroma chemical used extensively in perfumery for its striking aldehydic brightness and fresh green character. It belongs to the family of long-chain aldehydes that are famous for bringing sparkle, diffusion, and elegance to fragrance compositions.

Perfumers often rely on this ingredient to introduce a crisp, airy effect that elevates the freshness of a formula. The scent profile combines citrus-like brightness with slightly waxy and metallic nuances, producing a refined aldehydic character that works beautifully in floral and citrus perfumes.

The material is particularly valued in the creation of classic aldehydic fragrances where it contributes to the clean, radiant opening associated with iconic perfume styles. Because of its strong olfactory impact, only small amounts are required to transform a fragrance composition.

High-quality perfumery materials, including versions associated with Givaudan, are widely used by professional fragrance houses to ensure consistent aroma quality and performance in modern formulations.

Appearance, Physical State, and Chemical Information

Understanding the technical characteristics of Aldehyde C11 Undecylenic helps fragrance formulators determine how it behaves in various fragrance bases and applications.

Physical and Chemical Properties

• Chemical Name: Undecylenic Aldehyde

• CAS Number: 112-45-8

• Molecular Formula: C11H20O

• Molecular Weight: Approximately 168.28 g/mol

• Appearance: Colorless to pale yellow clear liquid

• Physical State: Liquid

• Odor Strength: Strong

• Boiling Point: Approximately 230°C

• Solubility: Soluble in alcohol and most fragrance solvents

• Specific Gravity: Around 0.83 – 0.84 at 25°C

• Refractive Index: Approximately 1.43

These properties make the ingredient stable enough for use across multiple fragrance product types including alcohol-based perfumes and household fragranced products.

Olfactory Profile and Fragrance Character

The aroma of Aldehyde C11 Undecylenic is immediately recognizable due to its crisp aldehydic freshness. It produces a distinctive scent that feels vibrant, slightly citrusy, and somewhat waxy.

This fragrance ingredient introduces a sparkling lift to perfume compositions. Its aldehydic character can create an impression of cleanliness and brightness, which is why it is often associated with elegant and sophisticated fragrances.

Typical odor descriptors include:

• Fresh aldehydic scent

• Citrus-like brightness

• Waxy and slightly metallic nuance

• Clean and airy character

• Light green tonalities

Because of these characteristics, the ingredient is capable of enhancing both modern and classic perfume structures.

Functional Role in Perfumery

In fragrance design, Aldehyde C11 Undecylenic typically acts as a top note ingredient. Its main role is to deliver immediate freshness and diffusion when a fragrance is first experienced.

Perfumers often use it in very small concentrations to create a radiant opening in perfumes. Even minimal quantities can significantly amplify the freshness and complexity of a fragrance formula.

It is frequently used to complement ingredients such as citrus oils, floral absolutes, and other aldehydes. When blended correctly, it produces an elegant aldehydic effect that feels refined rather than overpowering.

The ingredient also helps extend the perception of freshness in fragrances by reinforcing bright top notes while supporting floral heart structures.

Applications in Fragrance Products

Aldehyde C11 Undecylenic is used in many fragrance applications because of its versatility and powerful aldehydic character.

Common Applications

• Fine fragrance compositions

• Aldehydic floral perfumes

• Citrus and fresh fragrance accords

• Soap and detergent fragrances

• Fabric care products

• Cosmetic and personal care formulations

In classic perfumery, this ingredient is frequently used alongside other aldehydes to create the sparkling top notes associated with many timeless fragrances.

Usage levels generally remain low due to its strong aroma intensity, typically ranging from trace amounts up to around 0.5% in fragrance concentrates.

Storage and Handling Considerations

Proper storage is important to preserve the aromatic quality of Aldehyde C11 Undecylenic. Like many aldehydes, the material can be sensitive to oxidation if exposed to air for extended periods.

To maintain stability and product quality, the ingredient should be stored in tightly sealed containers and kept away from heat and direct sunlight. A cool, dry storage environment is recommended for long-term preservation.

When handled correctly, the ingredient remains stable and performs reliably in a wide range of fragrance formulations.

Conclusion

Aldehyde C11 Undecylenic continues to be an important material in perfumery thanks to its crisp aldehydic freshness and excellent diffusion. Its ability to brighten fragrance openings and enhance floral compositions makes it a valuable component in both traditional and modern perfume design.

Whether used to create sparkling aldehydic top notes or to reinforce the freshness of citrus and floral accords, this ingredient offers perfumers a powerful tool for crafting elegant and sophisticated fragrances.