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CAS 520-45-6

CAS 520-45-6 matches 1 EU annex record across Annex II–VI of Regulation 1223/2009.

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Chemical identity and properties

PubChem 2D chemical structure for CAS 520-45-6
CAS 520-45-6PubChem CID 122903

Dehydroacetic acid

IUPAC name
3-acetyl-6-methylpyran-2,4-dione
Molecular formula
C8H8O4
Molecular weight
168.15 g/mol
Exact mass
168.04225873 Da
XLogP3
0.3
Topological polar surface area
60.4 Ų
Hydrogen-bond donors
0
Hydrogen-bond acceptors
4
Covalent units
1
Defined stereocentres
0

Also known as

3-Acetyl-6-methyl-2H-pyran-2,4(3H)-dione2H-Pyran-2,4(3H)-dione, 3-acetyl-6-methyl-MethylacetopyrononeBiocide 470FAcetic acid, dehydro-3-Acetyl-6-methyl-2,4-pyrandione3-Acetyl-6-methyl-pyran-2,4-dione3-acetyl-6-methyl-3,4-dihydro-2H-pyran-2,4-dione
16 more reported names
CHEBI:1374263-Acetyl-6-methylpyrandione-2,4NSC-87702-Acetyl-5-hydroxy-3-oxo-4-hexenoic acid, .delta.-lactone3-acetyl-6-methyl-2,4-dioxo-3H-pyranDehydroacetic acid [ISO]GlyTouCan:G82156FZEpitope ID:613424DTXCID9014Dehydroacetic acid (Standard)HY-B1211RPGRHXDWITVMQBC-UHFFFAOYSA-MSK2505NSC87704-Hexenoic acid, .delta.-lactoneHMS3264K05
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External database identifiers

Retrieved from NIH PubChem on 2026-08-31 by checksum-valid CAS matching. Chemical properties do not replace the regulatory decision on this page.

Records for CAS 520-45-6

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How CAS 520-45-6 is used on this site

CAS 520-45-6 is the Chemical Abstracts Service identifier used to pin this page to a specific substance. In the current dataset, 1 EU annex record shares this identifier, which helps you cross-check whether the same substance appears under one regulatory context or several.

Use this page when a supplier specification, SDS or raw-material dossier gives you CAS 520-45-6 and you need to see every linked Annex II–VI record in one place. The entry cards above are the quickest route to concentration limits, warnings, annex placement and product-type conditions.