REACTIONS OF ALKALI-METAL DERIVATIVES OF METAL CARBONYLS .8. PREPARATION AND PROPERTIES OF CYCLOPENTADIENYLIRON DICARBONYL DERIVATIVES CONTAINING SILICON-SILICON AND SILICON-HYDROGEN BONDS

Reactions of NaFe(CO)2C5H5 with the permenthylpolysilanylcholorides(CH3)3Si[Si(CH32]nCL in tetrahrdrofuran solution give the yellow-orange (permethylpolysilanyl)iron derivatives (CH3)3Si[Si(CH3)2]nFe(CO)2C5H5 (n = 1,2, and 3). Similarly, the reactions of NaFe(CO)2C5H5 with the permethylpolysilanyl dichlorides Cl[Si(CH3)2]nCl give the yellow (permethylpolysilanyl)diiron derivatives C5H5Fe(CO)2[Si(CH3)]nFe(CO)2C5H5 (n = 2 and 3). Reaction of NaFe(CO)2C5H5 with dimethylchlorosilane gives orange volatile air-sensitive (CH3)2Si(H)Fe(CO)2C5H5, which exhibits an unusually low ν(SiH) frequency at 2071 cm-1 and which undergoes facile chlorination with carbon tetrachloride at room temperature to give yellow-orange crystalline (CH3)2Si(Cl)Fe(CO)2C5H5. Reactions of NaFe(CO)2C5H5 with the halides (CH3)3Si(CH2)nX (n = 1, X = Br; n = 3, X = Cl) give the orange liquids (CH3)3Si(CH2)nFe(CO)2C5H5 (n = 1 and 3). Triphenylphosphine reacts with (CH3)SiCH2Fe(CO)2C5H5 to give the carbonyl insertion product (CH3)3SiCH2COFe(CO)[P(C6H5)3](C5H5). Yellow crystalline C2H4[Si(CH3)2Fe(CO)2C5H5]2 was prepared from NaFe(CO)2C5H5 and the corresponding silicon chloride. © 1969.