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A remarkable nickelacycle has been synthesised via olefin metathesis of the α,ω-diene complex [Ni(η 5 -C 5 H 4 R)(Br)(NHC)] (R = C(CH 3 ) 2 CH 2 CH[double bond, length as m-dash]CH 2 , NHC = 1-(6-hexenyl)-3-(2,4,6-trimethylphenyl)-imidazol-2-ylidene). Single-crystal X-ray analysis reveals a helical shape of the molecule and stretching of some interatomic distances in the Ni(ii) coordination sphere. The Cp-NHC tethered complex shows catalytic activity resembling that of the parent complexes.

Axially chiral racemic half-sandwich nickel(ii) complexes by ring-closing metathesis