Asymmetric fluoro-organomercurials. Part 2. The synthesis and characterisation of the fluorovinyl-mercurials RHgCXCF_2 (R = Ph, Fc; X = F, Cl): The single crystal X-ray structures of PhHgCFCF=CF_2, FcHgCFCF=FC_2 and=FcHgCCl=CF_2[Fc(η~5-C_5_H)Fe(η~5

摘要

The asymmetric fluorovinyl mercurials RHgCXCF_2 (R = Ph, Fc; X = F, Cl) have been prepared from RHgCl and LiCXCF_2, the later being derived from the reaction of HFC-134a, CF_3CH_2F (X = F) or HCFC-133a, CF_3CH_2Cl (X = Cl) and n-BuLi. All the complexes have been fully characterised by spectroscopic methods and, apart from PhHgCCl=CF_2, the compounds are sufficiently stable to be investigated by single-crystal X-ray diffraction, making this the first report of structurally characterised asymmetric fluorovinyl mercurial complexes of the type RHg(CX=CF_2). In the solid state all of the structurally characterised complexes demonstrate asymmetric Hg–C distances and extensive intramolecular HgF and Hgη2-arene interactions are observed