SHEET /m/beta-ionone · PubChem CID 638014 · CAS 79-77-6 · REV 2026.07
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β-Ionone
from sourceC13H20O · 192.3 g/mol
What is β-Ionone?
The smell of violets, and famous because the nose fatigues to it within seconds, so the scent seems to come and go. from source
CategoryScent & aroma
Chemical familyKetones
Fig. 1 · 2D structure RDKit
SMILES
CC1=C(C(CCC1)(C)C)/C=C/C(=O)CThe dose makes the poison inferred
A reported rat oral LD50 for β-Ionone is 4,590 mg/kg, the dose lethal to half the animals tested. Scaled by body mass alone:
321.3 g
a median lethal dose scaled to 154 lb (321,300 mg)
“The dose makes the poison” is a cross-species estimate shown as neutral science, not a threshold anyone should act on. Real toxicity depends on the person, not body mass alone.
Toxicity & hazards
Toxicity · LD50
4,590 mg/kg · very low toxicity · LD50 rat oral from source
The dose lens above scales this to a body weight.
WarningIrritantEnvironmentalH315, H317, H401, H411from source
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Where β-Ionone leads
Relatedcomputed
β-Carotene63% similarIsotretinoin62% similarNo functional group in common: Isotretinoin carries a carboxylic acid group, while β-Ionone carries a ketone group.Tretinoin62% similarNo functional group in common: Tretinoin carries a carboxylic acid group, while β-Ionone carries a ketone group.Retinal61% similarNo functional group in common: Retinal carries an aldehyde group, while β-Ionone carries a ketone group.11-cis retinal61% similarNo functional group in common: 11-cis retinal carries an aldehyde group, while β-Ionone carries a ketone group.Retinol55% similarNo functional group in common: Retinol carries an alcohol group, while β-Ionone carries a ketone group.