1-diphenoxyphosphoryloxy-4-tert-butyl-benzene

p-t-Butylphenyl Diphenyl Phosphate is a compound with potential application to fire retardants, plasticizers and oils, due to its chemical composition.

Purify it by vacuum distillation, and percolation through an alumina column, followed by passage through a packed column maintained at 150o to remove residual traces of volatile materials in a counter-current stream of N2 at reduced pressure [Dobry & Keller J Phys Chem 61 1448 1957].