Arranging phosphoryl ligands on a calixarene platform

Article abstract of DOI:10.1016/S0022-328X(97)00365-3

Cone calix[4]arenes substituted at the lower rim by one to four -CH₂P(O)Ph₂ functionalities have been prepared in moderate to excellent yield, either directly from p-tert-butylcalix[4]arene or piecewise from calix[4]arenes containing easily removable protecting groups. The X-ray structure of a calix[4]arene-derived tris-(phosphine oxide) is presented.