5,5-Dimethyl-1,3,2-dioxaphosphorinane 2-oxide

5,5-二甲基-1,3,2-二氧磷杂环己烷-2-酮

Also known as: 5,5-Dimethyl-1,3,2-dioxaphosphorinan-2-one, 2,2-Dimethyl-1,3-propanediol cyclic phosphonate, Neopentylene phosphite, Neopentylglycol hydrogen phosphite, Cyclic 2,2-dimethyltrimethylene phosphonate, 5,5-Dimethyl-2-oxido-1,3,2-dioxaphosphorinane

5,5-Dimethyl-1,3,2-dioxaphosphorinane 2-oxide (CAS 4090-60-2) is a compound in the Solvents category listed in the Jingsj chemical database. It has the molecular formula C4H9O3P and a molecular weight of 136.08600 g/mol. It is also known as 5,5-Dimethyl-1,3,2-dioxaphosphorinan-2-one, 2,2-Dimethyl-1,3-propanediol cyclic phosphonate and Neopentylene phosphite. Key properties include a melting point of 51-56ºC(lit.) and a flash point of 229 °F. GHS signal word: Danger. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.

CAS No.: 4090-60-2
Jingsj CID: J-43303-3
Molecular Formula: C₄H₉O₃P
Chinese Name: 5,5-二甲基-1,3,2-二氧磷杂环己烷-2-酮
Molecular Weight: 136.08600 g/mol
Category: Solvents
Last updated: 8/21/2026

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Physicochemical Properties

Melting Point	51-56ºC(lit.)
Flash Point	229 °F

GHS Safety & Compliance

CorrosionSignal word: Danger

Frequently Asked Questions

What is the CAS number of 5,5-Dimethyl-1,3,2-dioxaphosphorinane 2-oxide?

The CAS number of 5,5-Dimethyl-1,3,2-dioxaphosphorinane 2-oxide is 4090-60-2.

What are the molecular formula and molecular weight of 5,5-Dimethyl-1,3,2-dioxaphosphorinane 2-oxide?

5,5-Dimethyl-1,3,2-dioxaphosphorinane 2-oxide has molecular formula C4H9O3P and molecular weight 136.08600 g/mol.

Is 5,5-Dimethyl-1,3,2-dioxaphosphorinane 2-oxide hazardous?

5,5-Dimethyl-1,3,2-dioxaphosphorinane 2-oxide has GHS signal word Danger.

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

Last updated: 8/21/2026

How to cite: Jingsj. "5,5-Dimethyl-1,3,2-dioxaphosphorinane 2-oxide (CAS 4090-60-2)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-43303-3 (accessed 2026-10-24).

Data for reference only; verify specifications, grades and regulatory status with suppliers before purchase.