Tris(2,4-di-tert-butylphenyl)phosphite is an organophosphorus compound with the formula [(C4H9)2C6H3O]3P. This white solid is a widely used stabilizer in polymers where it functions as a secondary antioxidant. It also reduces discoloration (yellowing) of plastics. The compound is a phosphite ester formed by the reaction of 2,4-di-tert-butylphenol with phosphorus trichloride. It is an approved food contact materials in the US.
See also Bis(2,4-di-tert-butylphenyl) pentaerythritol diphosphite - another phosphite antioxidant Pentaerythritol tetrakis(3,5-di-tert-butyl-4-hydroxyhydrocinnamate) - a common phenolic antioxidant that it often paired with.
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