SYNTHFESIS,STRUCTURE AND RFACTION OF TETRAMETHYL-DISILANDIYL DICYCLOPENTADIENYL TETRACARBONYL DI-IRON

The title compounds(Me_2SiSiMe_2)(η-RC_3H_3)Fe(CO)(μ-CO)_2(R:H(1a),Me(1b))wereprepared by heating a solution of RC_(?)H_4(Me_2SiSiMe_2)C_5H_4R and Fe(CO)_5 in xylene atreflux.(1a)and(1b)can convert into their isomers Me_2Si(η-RC_3H_3)Fe(CO)_2(?)2(R:H(2a),Me(2b))under the reaction conditions.The crystal and molecular structures of(1a),(2a)and(2b)were determined by X-ray diffraction.