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- W1966292218 abstract "While, the lithocene anion (Cp2Li-) can simply be generated by reacting 2 equiv of CpLi with PPh4Cl in THF, the attempted synthesis of the sodocene anion under similar reaction conditions results in the crystallization of [Cp-][PPh4+]. The structure consists of “naked” Cp anions pinched between metaphenyl hydrogens of the phosphonium cations. An ansa-sodocene anion in which the two Cp rings are bridged by a −C(Me)2−C(Me)2− chain is obtained by reaction of Me4C2(C5H4Na)2 with 1 equiv of PPh4Cl in THF. Its crystal structure shows a disordered ansa-sodocene anion containing a sandwiched sodium cation solvated by a THF molecule. Unbridged Cp2Na- was obtained by pushing the (CpNa + Cp-) ⇄ Cp2Na- equilibrium to the sodocene anion side. Cell dimensions, space group symmetry, and the molecular structure of [Cp2Na-][PPh4+] are remarkably similar to that of [Cp2Li-][PPh4+]. The anion can be described as a centrosymmetric (η5,η5)Cp2Na- sandwich (average C−Na = 2.630(3) Å) with approximate D5d symmetry." @default.
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- W1966292218 date "1996-01-09" @default.
- W1966292218 modified "2023-10-16" @default.
- W1966292218 title "Syntheses and X-ray Structures of Anionic Sodocene Sandwiches" @default.
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- W1966292218 doi "https://doi.org/10.1021/om950571d" @default.
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