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Tris(2-tert-butyl-4-methylphenyl) phosphite

Also known as: Phosphorous acid, tris(2-tert-butyl-4-methylphenyl) ester, Antioxidant P-EPQ, Irganox P-EPQ, Irgafos P-EPQ, 2-tert-butyl-4-methylphenol, phosphorous acid (3:1)

Tris(2-tert-butyl-4-methylphenyl) phosphite (CAS 21177-86-6) is a compound in the Organic Acids category listed in the Jingsj chemical database. It has the molecular formula C33H51O6P and a molecular weight of 574.72800 g/mol. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.

CAS No.
21177-86-6
Jingsj CID
J-1497697-7
Molecular Formula
C33H51O6P
Molecular Weight
574.72800 g/mol
Category
Organic Acids
Last updated
8/21/2026
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Physicochemical Properties

Exact Mass574.34200
PSA134.97000
LogP8.18450

Frequently Asked Questions

What is the CAS number of Tris(2-tert-butyl-4-methylphenyl) phosphite?

The CAS number of Tris(2-tert-butyl-4-methylphenyl) phosphite is 21177-86-6.

What are the molecular formula and molecular weight of Tris(2-tert-butyl-4-methylphenyl) phosphite?

Tris(2-tert-butyl-4-methylphenyl) phosphite has molecular formula C33H51O6P and molecular weight 574.72800 g/mol.

What are the upstream and downstream products of Tris(2-tert-butyl-4-methylphenyl) phosphite?

For Tris(2-tert-butyl-4-methylphenyl) phosphite, Upstream Products: 2-tert-Butyl-4-methylphenol; Downstream Products: 2-Phenyl-2-propanol, 1,2,3,4-Tetrahydro-1-naphthol, tert-Butanol.

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

Last updated:

How to cite: Jingsj. "Tris(2-tert-butyl-4-methylphenyl) phosphite (CAS 21177-86-6)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-1497697-7 (accessed 2026-11-09).

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