5,5-Dimethyl-2-pyrrolidinone

Also known as: 2-Pyrrolidinone,5,5-dimethyl-, 5,5-Dimethyl-2-pyrrolidone, 5,5-Dimethylpyrrolidin-2-one, 5,5-DiMethylpyrrolidine-2-one, 5,5-Dimethyl-pyrrolidin-2-on, 5,5-di-methylpyrrolidin-2-one, 5,5-dimethylpyrrolid-2-one

5,5-Dimethyl-2-pyrrolidinone (CAS 5165-28-6) is a compound in the Ketones category listed in the Jingsj chemical database. It has the molecular formula C6H11NO and a molecular weight of 113.158 g/mol. Key properties include a melting point of 39-40°C, a boiling point of 229.2±9.0 °C at 760 mmHg, a density of 0.9±0.1 g/cm3 and a flash point of 121.7±3.7 °C. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.

CAS No.: 5165-28-6
Jingsj CID: J-1070533-6
Molecular Formula: C₆H₁₁NO
Molecular Weight: 113.158 g/mol
Category: Ketones
Last updated: 8/21/2026

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Physicochemical Properties

Melting Point	39-40°C
Boiling Point	229.2±9.0 °C at 760 mmHg
Density	0.9±0.1 g/cm3
Flash Point	121.7±3.7 °C
Exact Mass	113.084061
PSA	29.10000
LogP	-0.42
Vapor Pressure	0.1±0.5 mmHg at 25°C
Refractive Index	1.435
Storage Conditions	2-8°C

Customs & Trade Information

HS Code	2933790090
Summary	2933790090. other lactams. VAT:17.0%. Tax rebate rate:9.0%. . MFN tariff:9.0%. General tariff:20.0%

Frequently Asked Questions

What is the CAS number of 5,5-Dimethyl-2-pyrrolidinone?

The CAS number of 5,5-Dimethyl-2-pyrrolidinone is 5165-28-6.

What are the molecular formula and molecular weight of 5,5-Dimethyl-2-pyrrolidinone?

5,5-Dimethyl-2-pyrrolidinone has molecular formula C6H11NO and molecular weight 113.158 g/mol.

What are the upstream and downstream products of 5,5-Dimethyl-2-pyrrolidinone?

For 5,5-Dimethyl-2-pyrrolidinone, Upstream Products: Methyl 4-methyl-4-nitropentanoate, acrylic acid methyl ester, Acrylamide; Downstream Products: 2,2-Dimethylpyrrolidine, 2,2-Dimethylpyrrolidine hydrochloride, 5,5-dimethylpyrrolidine-2-carboxylic acid.

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

Last updated: 8/21/2026

How to cite: Jingsj. "5,5-Dimethyl-2-pyrrolidinone (CAS 5165-28-6)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-1070533-6 (accessed 2026-11-09).

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