Serves as a key intermediate in synthesizing hindered phenolic antioxidants such as Irganox 1076 (octadecyl ester) used in polyolefins PVC and rubber to prevent oxidative degradation. Also applied in pharmaceutical antioxidants and polymer stabilizers.

Acts as a building block to impart thermal and oxidative stability to materials by radical scavenging with tert-butyl groups enhancing its antioxidant efficiency.

35-Di-tert-butyl-4-hydroxyphenylpropionic acid (CHO CAS 20170-32-5) is a white to off-white crystalline solid with molecular weight 278.39 gmol melting point 172-176C slightly soluble in water but soluble in organic solvents like ethanol and acetone. It features a phenolic hydroxy group ortho to a propionic acid chain with bulky tert-butyl groups at meta positions providing steric hindrance.