Complexes of novel alkyne-chelating tridentate ligands bound to a rhodium atom were isolated and characterised. The present alkyne–rhodium complex underwent dimerisation simply by heating to afford the unprecedented cyclobutadiene dirhodium complex. It is also found that the ligands at the trans positions influence the π-coordination of alkynes.
K. Okamoto, Y. Omoto, H. Sano and K. Ohe, Dalton Trans., 2012, 41, 10926 DOI: 10.1039/C2DT31322G
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