Thiodiglycol → 2,2'-Thiodiethylene Bis(3,5-di-tert-butyl-4-hydroxyhydrocinnamate)

Participants

Reaction Conditions

Reaction Steps

Using the general procedure of Example 11, 731 g (2.5 moles) of methyl 3,5-di-tert-butyl-4-hydroxyhydrocinnamate, and 150 g (1.23 moles) of 2,2'-thiodiethanol are heated to 120° C. Then, 0.26 g of dibutyltin diacetate (Fascat® 4200, Elf-Atochem, calculated 98 ppm Sn), is added and a vacuum of <50 mm Hg is imposed . The reaction mixture is heated to 160° C. The vacuum is reduced to <5 mm Hg and the reaction mixture is heated at 160° C. for a total of 7 hours. The vacuum is broken and the temperature is reduced to 100° C. to yield the title compound after crystallization from aqueous isopropanol. The product exhibited excellent transmission >99% at 425 nm.

Provenance & Evidence