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Butyl 5-oxo-L-prolinate

Also known as: Butyl (2S)-5-oxopyrrolidine-2-carboxylate, (S)-(-)-2-Pyrrolidone-5-carboxylic acid butyl ester, Butyl L-pyroglutamate, Butyl Pyroglutamate, 5-Oxo-L-proline butyl ester, L-Proline, 5-oxo-, butyl ester, Pyroglutamic acid n-butyl ester, (S)-5-Oxopyrrolidine-2-carboxylic acid butyl ester

Butyl 5-oxo-L-prolinate (CAS 4931-68-4) is a compound in the Organic Acids category listed in the Jingsj chemical database. It has the molecular formula C9H15NO3 and a molecular weight of 185.220 g/mol. Key properties include a boiling point of 334.6±35.0 °C at 760 mmHg, a density of 1.1±0.1 g/cm3 and a flash point of 156.2±25.9 °C. It is classified under GHS with signal word Warning and hazard statements H315 — Causes skin irritation, H319 — Causes serious eye irritation and H335 — May cause respiratory irritation. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.

CAS No.
4931-68-4
Jingsj CID
J-1013816-6
Molecular Formula
C9H15NO3
Molecular Weight
185.220 g/mol
Category
Organic Acids
Last updated
8/21/2026
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Physicochemical Properties

Boiling Point334.6±35.0 °C at 760 mmHg
Density1.1±0.1 g/cm3
Flash Point156.2±25.9 °C
Exact Mass185.105194
PSA55.40000
LogP-0.33
Vapor Pressure0.0±0.7 mmHg at 25°C
Refractive Index1.468

GHS Safety & Compliance

IrritantSignal word: Warning
  • H315 — Causes skin irritation
  • H319 — Causes serious eye irritation
  • H335 — May cause respiratory irritation

Frequently Asked Questions

What is the CAS number of Butyl 5-oxo-L-prolinate?

The CAS number of Butyl 5-oxo-L-prolinate is 4931-68-4.

What are the molecular formula and molecular weight of Butyl 5-oxo-L-prolinate?

Butyl 5-oxo-L-prolinate has molecular formula C9H15NO3 and molecular weight 185.220 g/mol.

Is Butyl 5-oxo-L-prolinate hazardous?

Butyl 5-oxo-L-prolinate has GHS signal word Warning and hazard statements H315 — Causes skin irritation; H319 — Causes serious eye irritation; H335 — May cause respiratory irritation.

What are the upstream and downstream products of Butyl 5-oxo-L-prolinate?

For Butyl 5-oxo-L-prolinate, Upstream Products: L-Glutamic acid, 1-Butanol, L-Pyroglutamic acid; Downstream Products: L-(+)-Prolinol, 5-(Hydroxymethyl)pyrrolidin-2-one.

Data compiled from public chemical databases such as PubChem and supplier catalogs; supplier offers are provided by suppliers.

Last updated:

How to cite: Jingsj. "Butyl 5-oxo-L-prolinate (CAS 4931-68-4)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-1013816-6 (accessed 2026-11-09).

Data for reference only; verify product details with suppliers before purchase.