Titanocene Pnictinidene Complexes
The phospha-Wittig reagent <sup>Mes</sup>TerPPMe<sub>3</sub> (<sup>Mes</sup>Ter = 2,6-{2,4,6-Me<sub>3</sub>-C<sub>6</sub>H<sub>2</sub>}-C<sub>6</sub>H<sub>3</sub>) and arsa-Wittig reagent <sup>Dip</sup>TerAsPMe<sub>3</sub> (<sup>Dip</sup>Ter = 2,6-{2,6-<i>i</i>Pr<sub>2</sub>-C<sub>6</sub>H<sub>3</sub>}-C<sub>6</sub>H<sub>3</sub>) have been employed to synthesize the titanocene complexes Cp<sub>2</sub>Ti(PMe<sub>3</sub>)PnAr (Pn = P, As) with terminal phosphinidene or arsinidene ligands, respectively. <a><i>Ab initio</i> studies show that the description as singlet biradicaloids in their ground state is warranted.</a><br>
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