Product Diversity in the Reaction of [(norbornadiene){CpP(iPr)2}Rh] with Alkyl Iodides

The reagents [(CpPR2)Li] [R = iPr (2b), cyclohexyl (2c)] react with [(nbd)RhCl] (nbd = norbornadiene) dimer [(1a)2] to yield the respective mononuclear complexes [(nbd)Rh(CpPR2)] (3b,c). Subsequent treatment of 3b with a large excess of MeI led to the formation of the stable organometallic phosphonium salt [(nbd)Rh{CpP(iPr)2Me}]I (4b). The analogous reaction of 3b with the slightly more bulky EtI or nPrI resulted in the formation of the dinuclear [μ-CpP(iPr)2]-bridged dirhodium complex [(nbd)Rh{CpP(iPr)2}Rh(nbd)I] (5b) and the corresponding ylides C5H4P(iPr)2R1 [R1 = Et (6b), nPr (6c)]. The rhodium complexes 3b, 4a and 5b were characterised by X-ray crystal-structure analyses. (© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2006)

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