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- W2085663309 abstract "Reaction of Na[M2(μ-Cl)3(CO)8], where M = Nb or Ta, with NaC5H4R, where R = COCH3, CO2CH3, CO2C2H5, COC6H5, COCH2C6H5, LiC5H4C(CH3)CH2, or NaC9H7 gives the corresponding (η5-C5H4R)M(CO)4, or (η5-C9H7)M(CO)4 compounds in good yield. NaC5H4COCH2C6H5, a new cyclopentadienyl synthon, was used to prepare TlC5H4COCH2C6H5, and (η5-C5H4COCH2C6H5)Mn(CO)3. The latter was fully characterized as a model compound for the new ligand. The niobium and tantalum compounds are air-stable as solids but readily undergo oxidation in solution. Compounds were characterized by IR, 1H and 13CNMR spectroscopies, and elemental analyses. Molecular structures of three compounds were determined. (η5-C5H4CO2CH3)Nb(CO)4: monoclinic, P21/c, a = 12.664(6) Å, b = 6.390(3) Å, c, = 15.355(9) Å, β = 97.81(4)°, V = 1231(1) Å3, Z = 4, and R(F) = 3.90%. (η5-C5H4CO2CH3)Ta(CO)4: monoclinic, P21/c, a = 12.612(4) Å, b = 6.399(1) Å, c, = 15.273(6) Å, β = 97.89(3)°, V = 1220.9(4) Å3, Z = 4, and R(F) = 5.67%. (η5-C9H7)Nb(CO)4: monoclinic, P21/c, a = 16.353(2) Å, b = 7.959(1) Å, c, = 12.778(4) Å, β = 106.14(2)°, V = 1597.7(6) Å3, Z = 4, and R(F) = 2.48%." @default.
- W2085663309 created "2016-06-24" @default.
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- W2085663309 date "1997-01-01" @default.
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- W2085663309 title "Ring functionalized cyclopentadienyl derivatives of niobium and tantalum: molecular structures of (η5-C5H4−CO2CH3)M(CO)4 where M = Nb and Ta and (η5-C5H4−CO2CH2C6H5)Nb(CO)4" @default.
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- W2085663309 doi "https://doi.org/10.1016/s0022-328x(97)00225-8" @default.
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