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
作者:Thomas E. Bitterwolf、Skip Gallagher、Arnold L. Rheingold、Glenn P.A. Yap
DOI:10.1016/s0022-328x(97)00225-8
日期:1997.1
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:
Na = Mb或Ta的Na [M 2(μ-Cl)3(CO)8 ]与NaC 5 H 4 R,其中R = COCH 3,CO 2 CH 3,CO 2 C 2 H 5, COC 6 ħ 5,COCH 2 ç 6 ħ 5,LIC 5 ħ 4 C(CH 3)CH 2,或NAC 9 ħ 7给出了相应的(η 5 -C 5 H ^ 4R)M(CO)4,或(η 5 -C 9 ħ 7)M(CO)4种以良好的收率化合物。NAC 5 ħ 4 COCH 2 C ^ 6 ħ 5,一个新的环戊二烯基合成子,用于制备TLC 5 ħ 4 COCH 2 C ^ 6 ħ 5,和(η 5 -C 5 H ^ 4 COCH 2 C ^ 6 ħ 5)的Mn(CO )3。后者被充分表征为新配体的模型化合物。铌和钽化合物作为固体具有空气稳定性,但易于在溶液中氧化。通过IR,1 H和13 CNMR光谱以及元素分析对化合物进行表征。确定了三种化合物的分子结构。(η