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Chemical product profile

HONGKUN / PRODUCT DIRECTORY

α-Acetyl-γ-butyrolactone | CAS 517-23-7

A cyclic beta-keto ester connecting an acetyl group with a gamma-lactone ring, used in published routes to hydroxyketone intermediates associated with thiamine chemistry.

CAS517-23-7
Molecular formulaC6H8O3
Molecular weight128.13 g/mol

Product overview

The acetyl substituent gives α-acetyl-γ-butyrolactone a reaction profile distinct from unsubstituted γ-butyrolactone. A ketone carbonyl and the lactone carbonyl create a beta-keto ester arrangement, combining carbon functionalization with the possibility of opening the cyclic ester. This compact architecture underlies its use as an intermediate feedstock. Published thiamine-related process literature describes its conversion within routes to 3-chloro-5-hydroxy-2-pentanone. The purchasing identity should include CAS 517-23-7 and the acetylated lactone structure, also named 3-acetyloxolan-2-one. Qualification should check intact starting material, related lactones and carbonyl compounds, and any water or acidity requirements imposed by the subsequent transformation.

Chemical identity

Chemical name
α-Acetyl-γ-butyrolactone
CAS number
517-23-7
Molecular formula
C6H8O3
Molecular weight
128.13 g/mol

Application context

α-Acetyl-γ-butyrolactone appears in published routes to 3-chloro-5-hydroxy-2-pentanone, an intermediate in thiamine synthesis. The route exploits the acetylated lactone framework and its conversion into an open-chain hydroxyketone structure. The compound therefore belongs to a precursor stage rather than being a vitamin ingredient itself. For a buyer evaluating this feedstock, the relevant specification is the composition needed for the selected sequence: residual unsubstituted lactone, other carbonyl-containing components and water may require separate review. Any stereochemical requirement should be stated explicitly, because the generic chemical identity does not establish a single-isomer grade.

Chemistry and synthetic role

The acetyl group is attached to the carbon adjacent to the lactone carbonyl. The resulting beta-keto ester motif can undergo carbon-centred transformation and lactone-ring conversion.

Quality review

Verify the acetylated lactone

Confirm both the cyclic ester and the acetyl substituent through identity data.

Resolve starting lactone and related species

Include γ-butyrolactone in impurity discussion when relevant to the proposed manufacturing route.

Agree water and acidity criteria

Define these against downstream chemistry and state the assay basis used for charging.

Preparing a specification

Request CAS 517-23-7 with identity and chromatographic assay, route-relevant lactone and carbonyl impurity limits, and water or acidity criteria. Specify any stereochemical requirement separately.

Packaging and storage

Packaging, closure and net weight are agreed for the selected grade, order quantity and destination. Confirm storage and transport requirements against the actual supplier SDS.

Documentation

Request a batch COA, specification, identity data and SDS. Confirm the availability of the analytical methods and any application-specific impurity results with the proposed supplier.

Procurement questions

Is ABL the same as γ-butyrolactone?

No. ABL contains an additional acetyl substituent and a beta-keto ester arrangement.

Is this vitamin B1?

No. It is a feedstock appearing upstream of thiamine intermediates.

Does the name guarantee one stereoisomer?

No. A single-isomer requirement needs explicit identity and analytical criteria.

Technical sources
  1. Alpha-acetyl-gamma-butyrolactone A0681TCI
  2. 2-Acetylbutyro-1,4-lactone substance informationECHA
  3. Synthesis of 3-chloro-5-hydroxy-2-pentanoneChina National Intellectual Property Administration