| Abstract: | The synthesis of calix4]arene‐based phosphorus diamides and phosphites is described. These oligocyclic ligands have been tested in the Rh(I)‐ catalyzed hydroformylation of 1‐octene. Depending on the reaction conditions, yields up to 99% and n/iso‐selectivities between 0.7 and 2.6 have been observed. tert‐Butyl groups on the upper rim of the calix4]arene template had a beneficial effect on the catalytic reaction. In general biuret‐derived P‐ligands were superior. For comparison, the corresponding “monomeric” ligands have also been synthesized and were employed in the catalytic reaction. © 2001 John Wiley & Sons, Inc. Heteroatom Chem 12:577–585, 2001 |
