The reaction of hexaalkylphosphorous triamides with oligophenols

Hexaalkylphosphorous triamides form in good yields 6-dialkylamino-12H-diben zo[d.g] [1,3,2]dioxaphosphocins 2a-i in the reaction with oligophenols 1a-i . Heating the sterical hindered compounds 2a-f up to 315 degrees C leads to the corresponding bicyclic phosphites 3a-d while the non-hindered phosphoc ins 2g-i react in refluxing xylene to give phosphites 3e-g. The phosphocin 2i formed another phosphocin 2i* during heating to 90 degrees C in THF by " wandering" of the phosphorus moiety. The bicyclic phosphites 3h and 3i were prepared starting from tetraphenol 1h and pentaphenol 1i by reaction with hexaethylphosphorous triamide in refluxing xylene. The diphosphorylated tri phenol 4 and tetraphenol 5 are formed in the reaction of the corresponding phenols with 2 eq. of hexaalkylphosphorous triamide.