The chemistry of (CsH4PPH2) 2Fe, dppf, upon its complexation with transition metals has attracted much interest for use in homogeneous catalysis' and as a possible antitumor agent? As a neighboring atom to P, S usually displays different chemistry from that of P due to a larger electronegativity and ader atomic Size for S. Brubaker reported the preparation and reactivity of a series offerrocenyl sulfide derivatives as bidentate chelating ligand^.^ ...