Tricarbonylbis diphenylphosphine iron

The reaction is carried out with 1.00 mL (1.49 g, 7.60 mmol) of Fe(CO)5, 2.77 mL (2.96 g, 15.9 mmol) of P(C6H5)2H, and 0.58 g (15.3 mmol) of Na[BH4]. Precipitation occurs upon cooling the reaction mixture to room temperature. The crude reaction mixture is placed in a freezer (5°C) for 12 h. The precipitate is collected by filtration and washed with three 10-mL aliquots of CH3OH. Yield 3.11 g, 79.9% (pure by IR). This sample is dissolved in 15 mL of ice-cold CH2C12 and filtered into 50 mL of ice-cold CH3OH. The precipitate and solution are cooled to 5°C for 12 h. The product is collected by suction filtration, washed with three 10-mL portions of ice-cold CH3OH, and air dried. Yield 2.57 g (66%). 

The properties of trans-Fe(CO)3(PR3)2 have been described in previous volumes Inorganic Syntheses. The physical properties are listed in the following table  

SUBMITTED BY J. M. MANRIQUEZ, E. E. BUNEL, and B. OELCKERS CHECKED BY C. VASQUEZ and JOEL S. MILLER  

The organometallic chemistry of the first-row transition metals generally starts with the binary metal carbonyl organometallic complexes. Noncarbonyl organometallic complexes starting with other easily accessible binary compounds provide entries to a broader spectrum of complexes. In this context, we describe the synthesis of the mixed sandwich complex (i -pentamethylcyclopentadienyl) (i -cyclopentadienyl) iron as an example of the synthetic utility of the solution-stable derivative (jj -pentamethyl-cyclopentadienyl) (2,4-pentanedionate) iron. 

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