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4,4,5,5-Tetramethyl-1,3,2-dioxaphospholane 2-oxide

4,4,5,5-四甲基-1,3,2-二氧磷杂环戊烷-2-氧化物

Also known as: Pinacol phosphonate, Phosphonic acid pinacol ester, HASPO-1, 4,4,5,5-Tetramethyl-1,3,2-dioxaphospholane 2-oxide, 2-Oxo-4,4,5,5-tetramethyl-1,3,2-dioxaphospholane

4,4,5,5-Tetramethyl-1,3,2-dioxaphospholane 2-oxide (CAS 16352-18-4) is a compound in the Aliphatic Hydrocarbons category listed in the Jingsj chemical database. It has the molecular formula C6H13O3P and a molecular weight of 164.13900 g/mol. It is also known as Pinacol phosphonate, Phosphonic acid pinacol ester and HASPO-1. Key properties include a melting point of 99-106ºC, a boiling point of 179.377ºC at 760 mmHg and a flash point of 79.028ºC. GHS signal word: Warning. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.

CAS No.
16352-18-4
Jingsj CID
J-1176745-1
Molecular Formula
C6H13O3P
Chinese Name
4,4,5,5-四甲基-1,3,2-二氧磷杂环戊烷-2-氧化物
Molecular Weight
164.13900 g/mol
Category
Aliphatic Hydrocarbons
Last updated
8/21/2026

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Physicochemical Properties

Melting Point99-106ºC
Boiling Point179.377ºC at 760 mmHg
Flash Point79.028ºC

GHS Safety & Compliance

IrritantSignal word: Warning

Frequently Asked Questions

What is the CAS number of 4,4,5,5-Tetramethyl-1,3,2-dioxaphospholane 2-oxide?

The CAS number of 4,4,5,5-Tetramethyl-1,3,2-dioxaphospholane 2-oxide is 16352-18-4.

What are the molecular formula and molecular weight of 4,4,5,5-Tetramethyl-1,3,2-dioxaphospholane 2-oxide?

4,4,5,5-Tetramethyl-1,3,2-dioxaphospholane 2-oxide has molecular formula C6H13O3P and molecular weight 164.13900 g/mol.

Is 4,4,5,5-Tetramethyl-1,3,2-dioxaphospholane 2-oxide hazardous?

4,4,5,5-Tetramethyl-1,3,2-dioxaphospholane 2-oxide has GHS signal word Warning.

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

Last updated:

How to cite: Jingsj. "4,4,5,5-Tetramethyl-1,3,2-dioxaphospholane 2-oxide (CAS 16352-18-4)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-1176745-1 (accessed 2026-10-25).

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