179991-41-4Relevant academic research and scientific papers
Formation of stable organometallic planar-tetracoordinate carbon compounds containing a cationic ( μ-R1CCR2)[ μ-chloro(ZrCp2)2] framework
Roettger, Dirk,Erker, Gerhard,Froehlich, Roland
, p. 221 - 225 (1996)
The methylzirconocene cation [Cp2ZrCH3(THF)+BPh4-] reacts with Cp2Zr(Cl)(C≡C-R) reagents (5a-c, R=-CH2Ph,-CH2CH2CH3,-CH3) to yield the dinuclear metallocene cations [(Cp2Zr)2(μ-Cl)(μ-η2 : η2-RCCCH3]+ (6a-c) (with BPh4- anion) that contain a planar-tetracoordinate carbon atom. Complex 6b was characterized by X-ray diffraction. The activation energy of the degenerate rearrangement of 6c was determined by temperature dependent dynamic 1H NMR spectroscopy (ΔG?(240 K) = 11.3 ± 0.5 kcal mol-1).
