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Reduction of the V(III) (β-(dimethylamino)ethyl)cyclopentadienyl dichloride complex [η5:η1-C5H 4(CH2)2NMe2]VCl2(PMe 3)(1) with 1 equiv of Na/Hg yielded the V(II) dimer {[η5:η1-C5H4(CH 2)2NMe2]V(μ-Cl)}2 (2). This compound reacted with diphenylacetylene in THF to give the V(II) alkyne adduct [η5:η1-C5H4(CH 2)2NMe2]VCl(η2-PhC≡CPh) (3). Further reduction of 2 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 [η5:η1-C5H4(CH 2)2NMe2]NMe2]V(C4Ph 4)(4). © 2008 American Chemical Society.

Vanadium (β-(Dimethylamino)ethyl)cyclopentadienyl Complexes with Diphenylacetylene Ligands