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CAS 542-28-9

CAS 542-28-9 matches 0 EU annex records across Annex II–VI of Regulation 1223/2009.

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Chemical identity and properties

PubChem 2D chemical structure for CAS 542-28-9
CAS 542-28-9PubChem CID 10953

Delta-Valerolactone

5-valerolactone is the simplest member of the class of delta-lactone that is tetrahydro-2H-pyran substituted by an oxo group at position 2. It derives from a hydride of an oxane. — ChEBI

IUPAC name
oxan-2-one
Molecular formula
C5H8O2
Molecular weight
100.12 g/mol
Exact mass
100.052429494 Da
XLogP3
-0.3
Topological polar surface area
26.3 Ų
Hydrogen-bond donors
0
Hydrogen-bond acceptors
2
Covalent units
1
Defined stereocentres
0

Also known as

TETRAHYDRO-2H-PYRAN-2-ONE5-Valerolactone2H-Pyran-2-one, tetrahydro-NSC-624714V1X9149LCHEBI:16545RefChem:585696208-807-1
16 more reported names
tetrahydropyran-2-oneTetrahydro-2-pyranonedelta-Valeryllactone.delta.-ValerolactoneValerolactone1-Oxacyclohexan-2-one.delta.-Valeryllactonetetrahydro-pyran-2-oneNSC 6247Penta-1,5-lactone3H-4,5,6-trihydropyran-2-one5-pentanolided-valerolactoneCyclopentanolideUNII-14V1X9149LN -Valerolactone
Open full PubChem recordPubChem annotations3D structure image
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 542-28-9

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How CAS 542-28-9 is used on this site

CAS 542-28-9 is the Chemical Abstracts Service identifier used to pin this page to a specific substance. In the current dataset, 0 EU annex records share 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 542-28-9 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.