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- W2009794302 abstract "A series of heteroleptic calcium η5-C5R5 cyclopentadienides supported by an N-Dipp (Dipp = 2,6-iPr2C6H3)-substituted β-diketiminate ligand have been synthesised by selective protonolysis of the readily available reagent [HC{(C(Me)N(Dipp))}2Ca{N(SiMe3)2}(THF)] with tetramethylcyclopentadiene, fluorene, indene or cyclopentadiene. No reaction was observed with pentamethylcyclopentadiene, presumably for steric reasons. The tetramethylcyclopentadienyl, fluorenyl and indenyl compounds were characterised by variable temperature 1H NMR and X-ray crystallography. Each complex was found to exist as a mononuclear species both in solution and in the solid state and to be highly sterically crowded, as evidenced by the variable temperature NMR studies. DFT (B3LYP/LANL2DZ) calculations on the model complexes [CaH(C5Me4H)], [CaH(C13H9)] and [CaH(C9H7)] indicate that the precise structures of such heteroleptic compounds are a result of both stereoelectronic and steric influences. Attempts to isolate the unsubstituted cyclopentadienyl were unsuccessful, but resulted in the crystallographic analysis of the dimeric calcium siloxide [HC{(C(Me)N(Dipp))}2Ca(μ-OSiMe3)]2." @default.
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- W2009794302 date "2006-03-01" @default.
- W2009794302 modified "2023-09-27" @default.
- W2009794302 title "Reactivity of [HC{(C(Me)N(Dipp))}2Ca{N(SiMe3)2}(THF)] (Dipp=C6H3iPr2-2,6) with C–H acids: Synthesis of heteroleptic calcium η5-organometallics" @default.
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- W2009794302 doi "https://doi.org/10.1016/j.jorganchem.2005.11.065" @default.
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