1-((tert-Butyldimethylsilyl)oxy)propan-2-yl-d6 bis(1-chloropropan-2-yl) Phosphate is an intermediate in the synthesis of Bis(1-chloroprop-2-yl) (1-Hydroxyprop-2-yl-d6) Phosphate (B415199), labeled form of Bis(1-chloroprop-2-yl) (1-Hydroxyprop-2-yl) Phosphate (B415196), which is a metabolite of Tris(1-chloro-2-propyl) Phosphate (T887860), that is a flame retardant of low hydrolytic stability, used in polyurethane (PU) rigid and flexible foam, PVC, EVA, phenolics and epoxy resin.