1-Ethyl-2-Pyrrolecarboxaldehyde (CAS 2167-14-8) — Mid Note Fragrance Ingredient
1-Ethyl-2-Pyrrolecarboxaldehyde
CAS 2167-14-8
What Is 1-Ethyl-2-Pyrrolecarboxaldehyde?
1-Ethyl-2-Pyrrolecarboxaldehyde (CAS 2167-14-8) is an aroma chemical used as a fragrance and flavour ingredient. Its odour is described as almond, green and sweet, placing it within the aldehydic family as a mid note with medium volatility. With a molecular weight of 123.2 (formula C7H9NO), it is handled by perfumers as a building block for compositions where a almond character is desired. The data below is compiled from public chemical and regulatory sources.
Safety Profile
HANDLE WITH CARE
What Does 1-Ethyl-2-Pyrrolecarboxaldehyde Smell Like?
The odour profile of 1-Ethyl-2-Pyrrolecarboxaldehyde is reported as almond, green, sweet, warm, chemical, floral. The dominant facet is its almond character, with the remaining notes adding nuance and complexity. As a mid note it contributes to the heart of a fragrance. Perceived intensity and exact character depend on concentration, the carrier and the surrounding accord.
Scent Profile
Profile derived from public odour-descriptor data; relative, not absolute.
Chemistry & Properties
The Chemistry
1-Ethyl-2-Pyrrolecarboxaldehyde has the molecular formula C7H9NO and a molecular weight of 123.2 g/mol. Its canonical SMILES representation is CCN1C=CC=C1C=O. Its reported log P (XLogP) of 1.32 indicates a moderately polar molecule, which informs how it partitions in a formula. Physical constants below are drawn from PubChem and EPA CompTox public datasets.
Physical & Chemical Properties
| Molecular Weight | 123.2 g/mol |
|---|---|
| Boiling Point | 208.0 °C |
| Melting Point | 20.05 °C |
| Flash Point | 84.76 °C |
| Density | 1.03 g/cm³ |
| Vapor Pressure | 0.191 mmHg |
| Water Solubility | 0.098 g/L |
| XLogP | 1.32 |
Perfumer Guide
Alternatives & Comparisons
Ingredients occupying a similar odour space — useful as substitutes or companions when 1-Ethyl-2-Pyrrolecarboxaldehyde is unavailable or restricted.
Shares floral, green, sweet character — a candidate substitute or companion in the same odour space.
Shares floral, green, sweet character — a candidate substitute or companion in the same odour space.
Shares floral, green, sweet character — a candidate substitute or companion in the same odour space.
Safety & Regulatory
⚠ Regulatory Disclaimer
General reference only. IFRA, REACH and EU Cosmetics Regulation standards update periodically. Consult the current IFRA Standards Library before formulating. Not legal or regulatory advice.
IFRA Status
No IFRA restriction recorded in the data set. This is not a guarantee of unrestricted status — always confirm against the current IFRA Standards Library.
GHS Classification
Signal word: Warning
Open 1-Ethyl-2-Pyrrolecarboxaldehyde in Fragrance Studio (Pro) for the calibrated vapour-pressure curve, the modelled odour-threshold estimate, and the substitute-matching engine across 2,900+ aromachemicals.
References & Sources
- PubChem Compound Summary (NIH) — search by InChIKey
- EPA CompTox Chemicals Dashboard — physicochemical & fate data
- IFRA Standards Library (49th / 51st Amendment)
Data: PubChem (NIH), EPA CompTox, IFRA. Last reviewed: Jun 2026.
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