Bis(2,4,6-tri-tert-butylphenyl)pentaerythritol diphosphite

双(2,4,6-三叔丁基苯基)季戊四醇二亚磷酸酯

Also known as: Ultranox 633, 3,9-bis[2,4,6-tris(1,1-dimethylethyl)phenoxy]-2,4,8,10-tetraoxa-3,9-diphosphaspiro[5.5]undecane, 2,4,8,10-Tetraoxa-3,9-diphosphaspiro[5.5]undecane, 3,9-bis[2,4,6-tris(1,1-dimethylethyl)phenoxy]-, 2,9-bis(2,4,6-tri-tert-butylphenoxy)-1,3,8,10-tetraoxa-2,9-diphosphaspiro[5.5]undecane, Bis(2,4,6-tri-tert-butylphenyl)pentaerythritol-di-phosphite

Bis(2,4,6-tri-tert-butylphenyl)pentaerythritol diphosphite (CAS 126505-35-9) is a compound in the Organic Acids category listed in the Jingsj chemical database. It has the molecular formula C41H66O6P2 and a molecular weight of 716.90700 g/mol. It is also known as Ultranox 633, 3,9-bis[2,4,6-tris(1,1-dimethylethyl)phenoxy]-2,4,8,10-tetraoxa-3,9-diphosphaspiro[5.5]undecane and 2,4,8,10-Tetraoxa-3,9-diphosphaspiro[5.5]undecane, 3,9-bis[2,4,6-tris(1,1-dimethylethyl)phenoxy]-. Key properties include a melting point of 262-264ºC, a boiling point of 596.2ºC at 760mmHg and a flash point of 395.5ºC. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.

CAS No.

126505-35-9

Jingsj CID

J-1511089-5

Molecular Formula

C₄₁H₆₆O₆P₂

Chinese Name

双(2,4,6-三叔丁基苯基)季戊四醇二亚磷酸酯

Molecular Weight

716.90700 g/mol

Category

Organic Acids

Last updated

8/21/2026