New FeLi2‐olefin complexes, e.g. (1), have been obtained from ferrocene by directed replacement of both C5H5 ligands. (1) reacts with COD to give (COD)2FeLi2 (2) [isolated as (2)·2 DME or (2)·2TMEDA]. which completes the series (COD)2Ni…(COD)2CoLi…(COD)2FeLi2
leads to formation of the I-(arylcarbony1oxy)aIkyltriphenylphosphonium salts 5[21, which can be converted by reaction with strong bases [sodium bis(trimethylsily1)amide 6a[3a1, lithium diisopropylamide 6b[3b1] into the corresponding 1-(arylcarbony1oxy)alkylidenetriphenylphosphoranes 7. The highly reactive ylides 7 (they undergo Wittig reactions even at -5OoC) have surprising properties: when their solutions are heated from -60°C to room temperature, the unsymmetrically substituted 1,2-diketones 9 and triphenylphosphane 4 are obtained.We presume that the carbanionic center initially reacts
Some new reactions of ferrocene with lithium and olefins involve only replacement of a C5H5 ligand. The product, e.g.(1). DME and (1). TMEDA, can be metalated with ZnCl2 or CdCl2 and transformed into trinuclear complexes with olefinic ligands bonded to iron, such as(2). Reaction of (1) and trityl chloride produces the monomeric radical CpFe(COD)•.
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