<b></b>Vanadium (β<i>-</i>(Dimethylamino)ethyl)cyclopentadienyl Complexes with Diphenylacetylene Ligands
Version 2 2008-05-26, 00:00
Version 1 2008-05-26, 00:00
dataset
posted on 2008-05-26, 00:00 authored by Guohua Liu, Xiaoquan Lu, Marcella Gagliardo, Dirk J. Beetstra, Auke Meetsma, Bart HessenReduction of the V(III) (β-(dimethylamino)ethyl)cyclopentadienyl dichloride complex [η<sup>5</sup>:η<sup>1</sup>-C<sub>5</sub>H<sub>4</sub>(CH<sub>2</sub>)<sub>2</sub>NMe<sub>2</sub>]VCl<sub>2</sub>(PMe<sub>3</sub>) (<b>1</b>) with 1 equiv of Na/Hg yielded the V(II) dimer {[η<sup>5</sup>:η<sup>1</sup>-C<sub>5</sub>H<sub>4</sub>(CH<sub>2</sub>)<sub>2</sub>NMe<sub>2</sub>]V(μ-Cl)}<sub>2</sub> (<b>2</b>). This compound reacted with diphenylacetylene in THF to give the V(II) alkyne adduct [η<sup>5</sup>:η<sup>1</sup>-C<sub>5</sub>H<sub>4</sub>(CH<sub>2</sub>)<sub>2</sub>NMe<sub>2</sub>]VCl(η<sup>2</sup>-PhCCPh) (<b>3</b>). Further reduction of <b>2</b> with Mg in the presence of diphenylacetylene resulted in oxidative coupling of two diphenylacetylene groups to yield the diamagnetic, formally V(V), bent metallacyclopentatriene complex [η<sup>5</sup>:η<sup>1</sup>-C<sub>5</sub>H<sub>4</sub>(CH<sub>2</sub>)<sub>2</sub>NMe<sub>2</sub>]V(C<sub>4</sub>Ph<sub>4</sub>) (<b>4</b>).
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