Rhodium Acetylacetonate and Iron Tricarbonyl Complexes of Tetracyclone and 3-Ferrocenyl-2,4,5-triphenylcyclopentadienone: An X-ray Crystallographic and NMR Study

Tetracyclone reacts with Fe2(CO)9 and with (acac)Rh(C2H4)2 to give (C4Ph4CO)Fe(CO)3 (3) and (C4Ph4CO)Rh(acac) (11), respectively. Likewise, 3-ferrocenyl-2,3,4-triphenylcyclopentadienone (2) yields (C4Ph3FcCO)Fe(CO)3 (7) and (C4Ph3FcCO)Rh(acac) (14). In 3, the peripheral phenyl substituents adopt a propeller conformation in the solid state, and the barrier to fluxionality of the Fe(CO)3 fragment is so low as to preclude the observation of …