Abstract
Abstract In order to improve the poor yield of the vanadocene and chromocene syntheses VCl2 · 2 THF has been prepared by reduction of VCl3 · 3 THF with zinc and CrCl2 · THF by action of hydrogen chloride on chromium. The metal(II) chlorides have been reacted with sodium methylcyclopentadienide and perdeuterocyclopentadienide to give the corresponding vanadocenes and chromocenes in yields up to 68% and 85%, respectively. The products have been characterized by paramagnetic 13C, 1H, and 2H NMR the latter being newly introduced in the class of organometallic π-radicals.
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