A new upper-rim phosphacalix[4]arene 5,17-bis(diphenylphosphinomethyl)-25,2
6,27,28-tetrapropoxycalix[4] arene (4) has been prepared starting from comm
ercially available tert-butyl calix[4]arene. Treatment of 4 with (COD)PdMeC
l and (COD)PtCl2 gives polymeric phosphine-coordinated Pd(II) and Pt(II) sp
ecies, respectively. 4 reacts with [(COD)RhCl](2), to give a di-rhodium com
plex that is an active catalyst for the hydroformylation of 1-octene and st
yrene. (C) 2001 Elsevier Science B.V. All rights reserved.