Irgafos 126

About Irgafos 126

Irgafos 126 is an organic building block carrying the CAS registry number 26741-53-7. Its molecular formula is C33H50O6P2 and its molecular weight is 604.7 g/mol. Its systematic (IUPAC) name is 3,9-bis(2,4-ditert-butylphenoxy)-2,4,8,10-tetraoxa-3,9-diphosphaspiro[5.5]undecane. It is also known as Antioxidant 626 or ADK Stab PEP 24.

Keep the container tightly sealed and store it in a cool, dry area. Under GHS it is labelled “Warning”, so handle it with suitable PPE and consult the SDS.

It is commonly used for organic synthesis and API synthesis. It is used across pharmaceutical manufacturing and academic and industrial research.

Standard pack sizes are 100 mg, 250 mg, 1 g and 5 g, and every batch ships with a Certificate of Analysis (COA) and we export worldwide. SDS and detailed specification sheets can be requested with your quotation.

Typical applications

Organic synthesis
API synthesis

Industries

Specifications & identifiers

Chemical identifiers
Product name	Irgafos 126
Catalogue No.	VQ-039280
CAS Number	26741-53-7
IUPAC name	3,9-bis(2,4-ditert-butylphenoxy)-2,4,8,10-tetraoxa-3,9-diphosphaspiro[5.5]undecane
Molecular formula	C₃₃H₅₀O₆P₂
Molecular weight	604.7 g/mol
Exact mass	604.3083
InChIKey	AIBRSVLEQRWAEG-UHFFFAOYSA-N
SMILES	CC(C)(C)C1=CC(=C(C=C1)OP2OCC3(CO2)COP(OC3)OC4=C(C=C(C=C4)C(C)(C)C)C(C)(C)C)C(C)(C)C
PubChem CID	93101

Physical properties
Physical form	Other
LogP (XLogP3)	9.9
H-bond donors / acceptors	0 / 6
TPSA	55.4 Å²
Synonyms	3,9-bis(2,4-di-tert-butylphenoxy)-2,4,8,10-tetraoxa-3,9-diphosphaspiro[5.5]undecane, Antioxidant 626, ADK Stab PEP 24, Antioxidant 242, Bis(2,4-di-tert-butylphenyl)pentaerythritol diphosphite, Alkanox P 24, Doverphos S 9432, ADK Stab PEP 24G, Bis(2,4-di-tert-butylphenyl) pentaerythritol diphosphite, AT 626, Phosphorous acid, cyclic neopentanetetrayl bis(2,4-di-tert-butylphenyl) ester, 3,9-Bis(2,4-di-tert-butylphenoxy)-2,4,8,10-tetraoxa-3,9-diphosphaspiro(5.5)undecane

Safety & hazard information (GHS)

Harmful / irritant

Environmental hazard

Signal word: Warning

Hazard statements

H315Causes skin irritation
H319Causes serious eye irritation
H335May cause respiratory irritation
H410Very toxic to aquatic life with long lasting effects

Precautionary statements: P261, P264, P264 + P265, P271, P273, P280, P302 + P352, P304 + P340, P305 + P351 + P338, P319, P321, P332 + P317, P337 + P317, P362 + P364, P391, P403 + P233, P405, P501

Classification is indicative (aggregated GHS notifications) and may vary by grade and concentration. Always refer to the SDS supplied with your lot.

Documents

Safety Data Sheet (SDS)16-section GHS · on request Certificate of AnalysisTypical / batch COA · on request Specification sheetTDS / MOA · on request

Frequently asked questions

What is the CAS number of Irgafos 126?

The CAS Registry Number of Irgafos 126 is 26741-53-7. It is also known as 3,9-bis(2,4-di-tert-butylphenoxy)-2,4,8,10-tetraoxa-3,9-diphosphaspiro[5.5]undecane, Antioxidant 626, ADK Stab PEP 24.

What is the molecular formula and molecular weight of Irgafos 126?

Irgafos 126 has the molecular formula C33H50O6P2 and a molecular weight of 604.7 g/mol. Its IUPAC name is 3,9-bis(2,4-ditert-butylphenoxy)-2,4,8,10-tetraoxa-3,9-diphosphaspiro[5.5]undecane.

Which grade and pack sizes of Irgafos 126 can I order?

We supply Irgafos 126, in 100 mg, 250 mg, 1 g, 5 g packs. Larger bulk quantities and custom packing are quoted on request.

Do you provide a COA and SDS with Irgafos 126?

Yes. Every lot of Irgafos 126 is shipped with a batch-specific Certificate of Analysis, and a 16-section GHS Safety Data Sheet is provided with the quotation and the shipment.

Can Irgafos 126 be shipped internationally?

Yes. Irgafos 126 is classified as hazardous, so it is packed in UN-approved packaging and shipped as dangerous goods under IATA/IMDG rules. We export worldwide on EXW, FOB, CIF and DAP terms.