cis-4-Hexenal (CAS 4634-89-3) — Top Note Fragrance Ingredient

ByThe Good Scents



green

cis-4-Hexenal

CAS 4634-89-3

Note
top
Volatility
high
MW
98.14
Data as of: Jun 2026

What Is cis-4-Hexenal?

cis-4-Hexenal (CAS 4634-89-3) is an aroma chemical used as a fragrance and flavour ingredient. Its odour is described as citrus, orange and sweet, placing it within the green family as a top note with high volatility. With a molecular weight of 98.14 (formula C6H10O), it is handled by perfumers as a building block for compositions where a citrus character is desired. The data below is compiled from public chemical and regulatory sources.

Safety Profile

HANDLE WITH CARE

Generally safeUse with awarenessProfessional use
CAS
4634-89-3
Formula
C6H10O
MW
98.14
InChIKey
DPCMFIRORYQTCL-IHWYPQMZSA-N
cis-4-Hexenal 2D structure

cis-4-Hexenal
C6H10O
Layer 1 · Enthusiast

What Does cis-4-Hexenal Smell Like?

The odour profile of cis-4-Hexenal is reported as citrus, orange, sweet, waxy, green. The dominant facet is its citrus character, with the remaining notes adding nuance and complexity. As a top note it contributes to the opening 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.

Layer 2

Chemistry & Properties

The Chemistry

cis-4-Hexenal has the molecular formula C6H10O and a molecular weight of 98.14 g/mol. Its canonical SMILES representation is C\C=C/CCC=O. Its reported log P (XLogP) of 1.54 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 98.14 g/mol
Boiling Point 127.2 °C
Melting Point -37.26 °C
Flash Point 32.31 °C
Density 0.8485 g/cm³
Vapor Pressure 11.26 mmHg
Water Solubility 0.068 g/L
XLogP 1.54

Perfumer Guide

Note Position
Top
Volatility
High
Primary Odour
Citrus

Alternatives & Comparisons

Ingredients occupying a similar odour space — useful as substitutes or companions when cis-4-Hexenal is unavailable or restricted.

1
(E)-dec-8-enal CAS 174155-47-6

Shares citrus, orange, sweet character — a candidate substitute or companion in the same odour space.

2
Butanal, 4-(heptyloxy)-3-methyl- CAS 1093653-57-6

Shares orange, sweet, waxy character — a candidate substitute or companion in the same odour space.

3
Poly[oxy(methyl-1,2-ethanediyl)], .alpha.-butyl-.omega.-hydroxy- CAS 9003-13-8

Shares citrus, sweet, floral character — a candidate substitute or companion in the same odour space.

Layer 3

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

H226

Odour detection threshold (air): 0.00015 ppb — a literature-curated value indicating its potency in the vapour phase.

Formulating with cis-4-Hexenal?

Open cis-4-Hexenal in Fragrance Studio (Pro) for the calibrated vapour-pressure curve, the modelled odour-threshold estimate, and the substitute-matching engine across 2,900+ aromachemicals.

Open in Fragrance Studio →

Free · Web-based · No install required

References & Sources

  1. PubChem Compound Summary (NIH) — search by InChIKey
  2. EPA CompTox Chemicals Dashboard — physicochemical & fate data
  3. IFRA Standards Library (49th / 51st Amendment)
Sources: PubChem (NIH) · EPA CompTox · IFRA Standards Library · public GHS classification. Odour descriptors are original editorial summaries of public profiles, not reproduced from any single proprietary source.

Data: PubChem (NIH), EPA CompTox, IFRA. Last reviewed: Jun 2026.

Report a data error

Similar Posts