partially fluorinated alkenes, such as previously unknown (Z)‐1,2‐(difluorovinyl)ferrocene. Mechanistic studies indicate a titanium(III) hydride as the active species, which forms a titanium(III) fluoride by H/F exchange with the substrate. The HDF step can follow both an insertion/elimination and a σ‐bond metathesis mechanism; the E/Z selectivity is controlled by the substrate. The catalysts’ ineffieciency
Synthesis of the Smallest Axially Chiral Molecule by Asymmetric Carbon-Fluorine Bond Activation
作者:Moritz F. Kuehnel、Tobias Schlöder、Sebastian Riedel、Belén Nieto-Ortega、Francisco J. Ramírez、Juan T. López Navarrete、Juan Casado、Dieter Lentz
DOI:10.1002/anie.201108105
日期:2012.2.27
Enantioselect‐DeFluor: Carbon–fluorinebond cleavage by a chiral zirconium complex allows the synthesis of optically active 1,3‐difluoroallene for the first time. Its absolute configuration was established by gas‐phase vibrational circular dichroism spectroscopy (see picture).