Hydrocarbyl derivatives of dppm- or dppa-bridged alkoxysilyl heterobimetallic Fe–Pd complexes and CO insertion reactions. Crystal structures of [(OC)3{(MeO)3Si}Fe(μ-dppm)Pd(8-mq)] (dppm = Ph2PCH2PPh2), [(OC)3Fe{μ-Si(OMe)2(OMe)}(μ-dppa)PdCl] and [(OC)3Fe{μ-Si(OMe)2(OMe)}(μ-dppa)PdPh] (dppa = Ph2PNHPP