Chemical and Structural Effects of Bulkness on Bent-Phosphinidene Bridges: Synthesis and Reactivity of the Diiron Complex [Fe 2 Cp 2 {μ-P(2,4,6-C 6 H 2 t Bu 3 )}(μ-CO)(CO) 2 ]

The steric pressure introduced by the 2,4,6-C 6 H 2 t Bu 3 group (R*) in the complex [Fe 2 Cp 2 (μ-PR*)(μ-CO)(CO) 2 ] (Cp = η 5 -C 5 H 5 ) has pronounced effects with regard to its synthesis, structure, thermal stability, and general reactivity of the bent phosphinidene bridge, enabling it, for instance, to react with hydrogen under mild conditions (ca. 4 atm, 290 K).