o,m,p-Tolualdehydes and their mixtures (CAS 529-20-4) — Mid Note Fragrance Ingredient

ByThe Good Scents



aldehydic

o,m,p-Tolualdehydes and their mixtures

CAS 529-20-4

Note
mid
Volatility
medium
MW
120.2
Data as of: Jun 2026

What Is o,m,p-Tolualdehydes and their mixtures?

o,m,p-Tolualdehydes and their mixtures (CAS 529-20-4) is an aroma chemical used as a fragrance and flavour ingredient. Its odour is described as fruity_other_than_citrus, floral and perfumery, placing it within the aldehydic family as a mid note with medium volatility. With a molecular weight of 120.2 (formula C8H8O), it is handled by perfumers as a building block for compositions where a fruity_other_than_citrus character is desired. The data below is compiled from public chemical and regulatory sources.

Safety Profile

USE WITH AWARENESS

Generally safeUse with awarenessProfessional use
CAS
529-20-4
Formula
C8H8O
MW
120.2
InChIKey
BTFQKIATRPGRBS-UHFFFAOYSA-N
o,m,p-Tolualdehydes and their mixtures 2D structure

o,m,p-Tolualdehydes and their mixtures
C8H8O
Layer 1 · Enthusiast

What Does o,m,p-Tolualdehydes and their mixtures Smell Like?

The odour profile of o,m,p-Tolualdehydes and their mixtures is reported as fruity_other_than_citrus, floral, perfumery, fragrant, aromatic, cherry__berry, almond, spicy, woody__resinous, minty__peppermint, sweet, etherish__anaesthetic, herbal__green_cutgrass, disinfectant__carbolic, medicinal, chemical, sharp__pungent__acid, oily__fatty, light, heavy, cool_cooling, warm. The dominant facet is its fruity_other_than_citrus 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.

Layer 2

Chemistry & Properties

The Chemistry

o,m,p-Tolualdehydes and their mixtures has the molecular formula C8H8O and a molecular weight of 120.2 g/mol. Its canonical SMILES representation is CC1=CC=CC=C1C=O. Its reported log P (XLogP) of 2.10 indicates a lipophilic, oil-soluble 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 120.2 g/mol
Boiling Point 200.0 °C
Melting Point -35.00 °C
Flash Point 76.60 °C
Density 1.04 g/cm³
Vapor Pressure 0.2818 mmHg
Water Solubility 0.01358 g/L
XLogP 2.10

Perfumer Guide

Note Position
Mid
Volatility
Medium
Primary Odour
Fruity_Other_Than_Citrus

Alternatives & Comparisons

Ingredients occupying a similar odour space — useful as substitutes or companions when o,m,p-Tolualdehydes and their mixtures is unavailable or restricted.

1
iodoform CAS 75-47-8

Shares fruity_other_than_citrus, fragrant, aromatic character — a candidate substitute or companion in the same odour space.

2
(4E)-5-methyl-4-[(3-methyl-5-oxo-1-phenyl-4H-pyrazol-4-yl)methylidene]-2-phenylpyrazol-3-one CAS 4702-90-3

Shares almond, aromatic, chemical character — a candidate substitute or companion in the same odour space.

3
5-methyl-2-phenyl-4-phenyldiazenyl-4H-pyrazol-3-one CAS 4314-14-1

Shares aromatic, chemical, cool_cooling 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

Subject to an IFRA restriction (51st Amendment) — maximum use levels apply by product category. Consult the current IFRA Standards Library before formulating.

GHS Classification

Signal word: Danger

H302H314H315H318H319H335
Formulating with o,m,p-Tolualdehydes and their mixtures?

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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.

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