Abstract
Zinc reacts quantitatively with bromo- and iodo-pentafluorobenzene in a variety of co-ordinating solvents to give solutions of ‘pentafluorophenylzinc halides’. Pentafluorophenyl exchange is normally slow on an n.m.r. time scale at 35°, and equilibrium constants for the Schlenk equilibrium (C6F5)2Zn + ZnX2⇄ 2C6F5ZnX have been obtained from the p-fluorine resonance spectra. Similar results are reported for ‘pentafluorophenylcadmium iodide’ in very strongly co-ordinating solvents. The Schlenk equilibrium for ‘pentafluorophenylzinc chloride’ in tetrahydrofuran has been studied by mixing solutions of zinc chloride and bis (pentafluorophenyl) zinc, and is established within 10 s.
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