In short
Ethyl (2E,4Z)-decadienoate, known as pear ester, is the character-impact compound of Bartlett (Williams) pears. It gives a juicy, ripe pear note.
What Ethyl Decadienoate (Pear Ester) smells like
Pear ester (ethyl decadienoate) is the smell of a juicy, ripe Bartlett — Williams — pear. Bedoukian describes the characteristic odour of the Bartlett pear and says it adds a juicy, ripe pear note to fruity florals; Moellhausen gives juicy, green, fruity, apple and pear with tropical nuances, an intense Williams pear; Symrise juicy, ripe pear, sweet and very fruity. At 1% it reads sweet ripe pear, creamy and slightly fatty with green, waxy apple and fleshy nuances.
- Leading note
- Ripe Williams pear
- Clear facets
- Juicy
- Supporting facets
- Green, waxy skin
- Faint facets
- Creamy, tropical
- Character
- Juicy, ripe, fleshy, sweet
What makes Ethyl Decadienoate (Pear Ester) distinctive
The pear itself: juicy, fleshy and ripe, where the simple esters give only a general pear-and-apple idea.
How Ethyl Decadienoate (Pear Ester) is used
Used to give a juicy, ripe pear note to fruity florals and fruity compositions, and in pear flavours.
Typical role: modifier (used in small amounts to change the character of a blend).
How Ethyl Decadienoate (Pear Ester) differs from similar materials
- Hexyl Acetate
- Hexyl acetate is a lighter, greener pear and apple; pear ester is the juicy, ripe Williams pear.
- Helvetolide
- Helvetolide is a musk with a pear-skin facet; pear ester is the juicy Williams pear fruit itself.
Each difference compares the published descriptions of the two materials. Smell varies with grade, supplier and dilution; compare them side by side on blotters before substituting one for another.
Formulation considerations
Powerful; use in small amounts.
Identity and classification
- Type
- Aroma chemical
- Origin
- Occurs in nature
- Odour family
- Fruity / Green
- Note position
- Top to heart note
- Physical form at room temperature
- Liquid
- Also known as
- Ethyl (2E,4Z)-deca-2,4-dienoate, Pear ester
- CAS number
- 3025-30-7
- Molecular formula
- C12H20O2
- Molecular weight
- 196.29 g/mol
- IUPAC name
- ethyl (2E,4Z)-deca-2,4-dienoate
The CAS number, formula and molecular weight are taken from PubChem compound 5281162, whose own record lists this CAS number; checked 19 October 2026.
Safety and compliance
Hazard classification of the neat substance, as PubChem summarises it, read 26 October 2026. Companies notifying the ECHA C&L Inventory classify it (1,718 reports): H412 harmful to aquatic life with long lasting effects (92.8% of reports). 1 of the reports find it does not meet the hazard criteria. Unless it is harmonised, this is the notifiers' own classification, not a binding one.
This page is general information, not a safety assessment or a specification. Confirm identity, composition, IFRA status and allergen content from your supplier's documents for the lot you hold.
Materials it works with
-
Hexyl Acetate
Aroma chemical · Fruity / Green — pear, apple, fruity, green
-
Isoamyl Acetate
Aroma chemical · Fruity / Gourmand — banana, pear drop, fruity, sweet
-
Liffarome
Aroma chemical · Green / Fruity — green, fruity, pear, violet leaf
-
Prenyl Acetate
Aroma chemical · Fruity / Green — fruity, banana, pear, green
Used in formulas and accords
Used in 5 published formulas
Ethyl Decadienoate (Pear Ester) is an ingredient in 5 perfume formulas in the Formula & Accord Library.
RUŌOD House Originals
Original compositions by RUŌOD House.
Further reading
Questions about Ethyl Decadienoate (Pear Ester)
Is Ethyl Decadienoate (Pear Ester) natural or synthetic?
The molecule occurs in nature. Commercial Ethyl Decadienoate (Pear Ester) may be made by synthesis or obtained from natural sources, so check the supplier's specification if the distinction matters to you.
What is the CAS number of Ethyl Decadienoate (Pear Ester)?
3025-30-7. It was checked against PubChem on 19 October 2026.
Which published formulas use Ethyl Decadienoate (Pear Ester)?
Ethyl Decadienoate (Pear Ester) is used in 5 published formulas in the RUŌOD Lab Formula & Accord Library, including Ambrette Halo, Champagne Static and Honeydew Static. Each is listed with a link under "Used in formulas and accords" on this page.
Sources
- PubChem — compound 5281162, checked 19 October 2026.
- PubChem — GHS classification (the ECHA C&L Inventory notifications and any harmonised EU entry), read 26 October 2026.
- The Good Scents Company — ethyl decadienoate (with Bedoukian, Moellhausen and Symrise descriptions) — odour database.
- ChemicalBook — ethyl decadienoate (CAS 3025-30-7) — odour database.
- Olfactory profile: the RUŌOD Lab team's synthesis of the published descriptions above, reviewed 21 October 2026. Evidence: several independent published descriptions, which agree. Classification and the short description: revision 1. Descriptions of odour are judgement, not measurement.