¹³C‐ and ¹H‐NMR. Studies on the Configuration of Tricarbonyliron Complexes of Oxa‐ and Aza[4.4.3]propellanes

Abstract

Abstract The configurations of a series of mono ‐ and bis ‐Fe(CO) 3 complexes of 12‐oxa[4.4.3]‐propella‐2,4,7,9‐tetraene ( 1 ) and of 11,13‐dioxo‐12‐methyl‐12‐aza[4.4.3]propella‐2,4,7,9‐tetraene ( 7 ) as well as of a trienic aza‐propellane complex have been studied in solution by 13 C‐ and 1 H‐NMR. spectroscopy. Praseodymium‐induced 13 C‐shifts of the metalcarbonyl carbon atoms and of the central carbon atom of the complexed diene systems are particularly sensitive and useful to prove exo ‐ or endo ‐configuration of the tricarbonyliron ligand. In addition, H,H‐ and C,H‐coupling constants of the complexes and parent compounds are reported and discussed.