Abstract

The weakly-coordinated trifluoromethanesulfonate (triflate) in trans-(Ph 3P) 2Rh(CO)(OTf) (OTfOSO 2CF 3) can be readily replaced by ligand L to form stable ionic complexes [ trans-(Ph 3P) 2RhL(CO)]OTf (LMeCN, formamide pyrone and urea). The replacement of triflate by carbon monoxide forms an unstable species that gradually loses CO and returns the starting material. Sterically hindered ligands such as 1,1,3,3-tetramethylurea and xanthone do not react.

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