Selective Hydroformylation of Cyclodienes to Cycloalkenecarboxaldehydes Using Catalysts Directly Derived from Rh Vapour and Cyclodienes

Cocondensation of Rh atoms with cyclodienes at liquid nitrogen temperature yields Rh complexes, thermally stable in excess of the ligand, which are good catalysts for the selective hydroformylation of cyclodienes to cycloalkenecarboxaldehydes.