tetrabutyl-ammonium chloride; sodium acetate; triphenylphosphine; palladium diacetate in N,N-dimethyl-formamide T=100°C; Condensation; rearrangement; 48 h;

[{(η5-C5Me5)RhCl}2(μ-Cl)2]; copper diacetate in anhydrous xylene T=120°C; 8 h; Inert atmosphere; Overall yield = 71 percent;

1: Pd catalyst; alkaline condition / |Heating; |Inert atmosphere 2: [{(η5-C5Me5)RhCl}2(μ-Cl)2]; copper diacetate / anhydrous xylene / 8 h / 120 °C / |Inert atmosphere View Scheme

1: bis-triphenylphosphine-palladium(II) chloride / |Inert atmosphere 2: Pd catalyst; alkaline condition / |Heating; |Inert atmosphere 3: [{(η5-C5Me5)RhCl}2(μ-Cl)2]; copper diacetate / anhydrous xylene / 8 h / 120 °C / |Inert atmosphere View Scheme