Abstract
AbstractThe synthesis of calix[4]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 calix[4]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
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