4,5-Dimethyl-2-Isobutylthiazole (CAS 53498-32-1) — Mid Note Fragrance Ingredient

ByThe Good Scents



terpenic

4,5-Dimethyl-2-Isobutylthiazole

CAS 53498-32-1

Note
mid
Volatility
medium
MW
169.3
Data as of: Jun 2026

What Is 4,5-Dimethyl-2-Isobutylthiazole?

4,5-Dimethyl-2-Isobutylthiazole (CAS 53498-32-1) is an aroma chemical used as a fragrance and flavour ingredient. Its odour is described as earthy, green and nutty, placing it within the terpenic family as a mid note with medium volatility. With a molecular weight of 169.3 (formula C9H15NS), it is handled by perfumers as a building block for compositions where a earthy 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
53498-32-1
Formula
C9H15NS
MW
169.3
InChIKey
NSVPHVLZAKJSGV-UHFFFAOYSA-N
4,5-Dimethyl-2-Isobutylthiazole 2D structure

4,5-Dimethyl-2-Isobutylthiazole
C9H15NS
Layer 1 · Enthusiast

What Does 4,5-Dimethyl-2-Isobutylthiazole Smell Like?

The odour profile of 4,5-Dimethyl-2-Isobutylthiazole is reported as earthy, green, nutty, pea, roasted, cocoa. The dominant facet is its earthy 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

4,5-Dimethyl-2-Isobutylthiazole has the molecular formula C9H15NS and a molecular weight of 169.3 g/mol. Its canonical SMILES representation is CC(C)CC1=NC(C)=C(C)S1. Its reported log P (XLogP) of 2.96 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 169.3 g/mol
Boiling Point 210.6 °C
Melting Point 9.06 °C
Flash Point 80.85 °C
Density 0.8005 g/cm³
Vapor Pressure 0.0912 mmHg
Water Solubility 0.017 g/L
XLogP 2.96

Perfumer Guide

Note Position
Mid
Volatility
Medium
Primary Odour
Earthy

Alternatives & Comparisons

Ingredients occupying a similar odour space — useful as substitutes or companions when 4,5-Dimethyl-2-Isobutylthiazole is unavailable or restricted.

1
2-Isobutyl-3-methylpyrazine CAS 13925-06-9

Shares earthy, green, nutty character — a candidate substitute or companion in the same odour space.

2
Methoxypyrazine CAS 3149-28-8

Shares earthy, green, nutty character — a candidate substitute or companion in the same odour space.

3
2-Ethyl-5-Methylpyrazine CAS 13360-64-0

Shares green, nutty, roasted 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

H302
Formulating with 4,5-Dimethyl-2-Isobutylthiazole?

Open 4,5-Dimethyl-2-Isobutylthiazole in Fragrance Studio (Pro) for the calibrated vapour-pressure curve, the modelled odour-threshold estimate, and the substitute-matching engine across 2,900+ aromachemicals.

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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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