| abstract |
The present invention relates to a phosphorus-containing calixarene of the following general formula (I), and also to a process for preparing the same, and to a rhodium / carbonyl ruthenium carbonyl complex using a phosphorus-containing calyxarene of the general formula (I) as a ligand. To a process for the preparation of aldehydes by hydroformylating C 3 -C 20 -olepin by use of: |