Dynamic equilibration of η1-carbene and η2-alkyne moieties within an alkynylcarbene dimanganese complexElectronic supplementary information (ESI) available: details of synthesis and spectral characterisation of the new complexes. See http://www.rsc.org/suppdata/cc/b1/b104712b/

Abstract

The coordination of an additional [Cp(CO)₂Mn] fragment to the alkyne linkage of an alkynylcarbene complex of the type Cp(CO)₂MnC(R′)CCR″ yields a highly fluxional molecule, in which the [η¹-carbene] and [η²-alkyne] moieties are seen to exchange rapidly on the NMR time scale.