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CAS 187991-39-5

CAS 187991-39-5 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 187991-39-5

CAS 187991-39-5PubChem CID 71587606

Methylsilanol ascorbate

IUPAC name: (2R)-2-[(1S)-2-[dihydroxy(methyl)silyl]oxy-1-hydroxyethyl]-3,4-dihydroxy-2H-furan-5-one

Molecular formula: C7H12O8Si
Molecular weight: 252.25 g/mol
Exact mass: 252.03014387 Da
Topological polar surface area: 137.0 Å²
Hydrogen-bond donors: 5
Hydrogen-bond acceptors: 8
Covalent units: 1
Defined stereocentres: 2

Also known as

UNII-46Z5D1I0IS46Z5D1I0ISL-Ascorbic acid, 6-O-(dihydroxymethylsilyl)-RefChem:158312METHYLSILANOL ASCORBATE [INCI](5R)-5-[(1S)-2-{[Dihydroxy(methyl)silyl]oxy}-1-hydroxyethyl]-3,4-dihydroxyfuran-2(5H)-one

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External database identifiers

EPA DTXSID:DTXSID00172130

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

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How CAS 187991-39-5 is used on this site

CAS 187991-39-5 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 187991-39-5 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.