Synthesis and reactivity of cyclometalated triamidophosphine complexes of niobium and tantalum.
Synthesis and reactivity of cyclometalated triamidophosphine complexes of niobium and tantalum.
复制标题
铌钽环金属化三酰胺膦配合物的合成及反应活性
DOI:
10.1021/acs.inorgchem.5b00333
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发表时间:
2015
影响因子:
4.6
通讯作者:
J. Ballmann
中科院分区:
文献类型:
--
作者:
M. Sietzen;H. Wadepohl;J. Ballmann
The triamidophosphine protioligand1reacts with the homoleptic pentakis(dimethylamido) precursors of niobium and tantalum [M(NMe2)5, where M = Nb, Ta] to form cyclometalated complexes of the type [N2PCN-κ5-N,N,P,C,N]M(NMe2) (2-M). Apart from the three amido donors, one benzylic position of the ligand backbone is deprotonated over the course of this reaction, resulting in the formation of a new M–C bond. As a consequence, a metallaziridine substructure is formed, and the triamidophosphine moiety thus serves as a tetraanionic pentadentate ligand. The dimethylamido complexes2-Mcan be converted into the corresponding triflates [N2PCN-κ5-N,N,P,C,N]M(OTf) (3-M) and alkyl complexes [N2PCN-κ5-N,N,P,C,N]M(CH2SiMe3) (4-M) by treatment with triethylsilyl triflate (Et3SiO3SCF3) followed by (trimethylsilyl)methyllithium (LiCH2SiMe3). The alkyl complexes exhibit interesting reactivities, including a second cyclometalative backbone activation affording the trimethylphosphine-stabilized complexes [NP(CN)2-κ6-N,P,C,N,C,N]M(PMe3) (5-M). In the case of tantalum, the formation of a dinuclear hydrido complex (6) is observed upon hydrogenation of4-Ta. In the case of niobium, the metallaziridine substructure in4-Nbis prone to ring opening via protonation with triphenylsilylamine (Ph3SiNH2), resulting in formation of the corresponding imido complex [PN3-κ4-P,N,N,N]NbNSiPh3(7).
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DOI:
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发表时间:
1990
期刊:
影响因子:
--
作者:
R. Shinomoto;P. Desrosiers;T. P. Harper;T. Flood
通讯作者:
T. Flood
影响因子:
16.6
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--
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1985
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K. Prout
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--
发表时间:
1997
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L. Giannini;A. Caselli;E. Solari;C. Floriani;A. Chiesi;C. Rizzoli;N. Re;A. Sgamellotti
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A. Sgamellotti
DOI:
--
发表时间:
2001
期刊:
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--
作者:
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