reactions of cis-Fe(CO)4(CiCl3)2 (1d): with PPh3 or PMePh2 only the phosphine-substituted derivatives Fe(CO)3(PR3)(SiCl3)2 are formed, while the more basic phosphinesPMe2Ph or PMe3 give the SiCl2-bridged dinuclearcomplexes Fe2(CO)8−n(PR3)n(μ-SiCl2)2 (PMe2Ph: n = 2; PMe3: n = 1, 2) instead. The formation of SiR2-bridged complexes in the reaction of Fe(CO)4(SiR3)2 with phosphines is restricted to the