Tertiary phosphine complexes of cyclopentadienylmolybdenum carbonyl halides. Stereoselective syntheses and isomer separations |
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| Authors: | David L Beach Marion Dattilo Kenneth W Barnett |
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| Institution: | Department of Chemistry, University of Missouri-St. Louis, St. Louis, Missouri 63121 U.S.A. |
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| Abstract: | Pure cis and trans isomers of CpMo(CO)2(L)X (Cp = η5-C5H5, L = PPh3 or PBu3, X = Br, or I) have been separated by chromatography and characterized by infrared and proton NMR spectroscopy. The reactions of trans-CpMo(CO)2(L)CH3 with HgX2 (X = Cl, Br, I, SCN) afford cis-CpMo(CO)2(L)X in high yield. Both linkage isomers are obtained in the reaction with Hg(SCN)2, L = PPh3. The mercuric halides react with CpMo(CO)2(L)COCH3 to form the metalmetal bonded derivatives trans-CpMo(CO)2(L)HgX. Reactions of CpMo(CO)2(L)CH3 or CpMo(CO)2(L)COCH3 with bromine or iodine yield the halide complexes CpMo(CO)2(L)X (X = Br and I, respectively), the product mixtures containing high proportions of the trans isomers. |
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