Arranging phosphoryl ligands on a calixarene platform
摘要:
Cone calix[il]arenes substituted at the lower rim by one to four -CH(2)P(O)Ph(2) 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. (C) 1997 Elsevier Science S.A.