Friday, 6 October 2006
South Ballroom (Binghamton Regency Hotel and Conference Center)
389

Readily Available 1,5–Cyclooctadiene)Rh(PPh3)X (X = OAc, OSiMe3) Complexes as Precursors to the Rhodium(I) Silyl Complex trans-(PPh3)22-norbornene)RhSiMe2Ph

Kathleen Linn, Jennifer Vreeland, and Alan Cutler. Rensselaer Polytechnic Institute, Troy, NY

The readily available (η4-COD)(triphenylphosphine)rhodium(I) acetate and trimethylsiloxide complexes have been established as useful precursors for generating the recently discovered rhodium(I) silyl complex, trans-(PPh3)22-NBE)RhSiMe2Ph, (COD = 1,5–cyclooctadiene, NBE = norbornene). A two-step sequence was used to first convert the (COD)(phosphine)rhodium acetate or siloxide complexes to the known (η3-cyclooctenyl)(bistriphenylphosphine)rhodium compound using one equiv. each of phenyldimethylsilane and triphenylphosphine. This intermediate, independently generated from the reaction of RhH(PPh3)3 and COD, was characterized by 1H,13C,31P NMR spectroscopy. Subsequent treatment with additional hydrosilane and NBE released cyclooctene (COE) and generated the desired rhodium(I) silyl complex in a much slower reaction. Further details on the optimization of this reaction as a one-pot pot synthesis, reaction nuances, and characterization of salient rhodium complexes will be presented.

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