The mononuclear cationic Rh I complexes [Rh(cod)(mdd)] + X − and [Rh(CO) 2 (mdd)] + X − (X = BPh 4 , PF 6 ) containing the chelating bidentate N ‐heterocyclic carbene ligand 1,1′‐methylene‐3,3′‐dimethyldiimidazoline‐2,2′‐diylidene (mdd) have been synthesised and spectroscopically characterised. The complexes [Rh(cod)(mdd)] + BPh 4 − and [Rh(CO) 2 (mdd)] + PF 6 − have also been characterised by X‐ray crystallography. The dicarbonyl complexes catalyse the intramolecular hydroamination of 4‐pentyn‐1‐amine to 2‐methyl‐1‐pyrroline. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2003)
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Burling et al. (2003) studied this question.
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