Abstract
AbstractReduction of the FeII complex [(PhPP2Cy)FeCl2] (2) generated an electron‐rich and unsaturated Fe0 species, which was reacted with white phosphorus. The resulting new complex, [(PhPP2Cy)Fe(η4‐P4)] (3), is the first iron cyclo‐P4 complex and the only known stable end‐deck cyclo‐P4 complex outside Group V. Complex 3 features an FeII center, as shown by Mössbauer spectroscopy, associated to a P42− fragment. The distinct reactivity of complex 3 was rationalized by analysis of the molecular orbitals. Reaction of complex 3 with H+ afforded the unstable complex [(PhPP2Cy)Fe(η4‐P4)(H)]+ (4), whereas with CuCl and BCF, the complexes [(PhPP2Cy)Fe(η4:η1‐P4)(μ‐CuCl)]2 (5) and [(PhPP2Cy)Fe(η4:η1‐P4)B(C6F5)3] (6) were formed.
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