Cyclometalated titanium and zirconium complexes stabilised by a new silylmethylene-linked tetradentate triamidophosphine.

Cyclometalated titanium and zirconium complexes stabilised by a new silylmethylene-linked tetradentate triamidophosphine.
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由新型甲硅烷基亚甲基连接的四齿三酰胺膦稳定的环金属化钛和锆配合物

DOI:
10.1039/c5dt04561d
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发表时间:
2016
影响因子:
4
通讯作者:
J. Ballmann
J. Ballmann
中科院分区:
化学2区
文献类型:
--
作者:
M. Sietzen;P. Federmann;C. Sonnenschein;H. Wadepohl;J. Ballmann

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以三锂盐Li3[P(CH2SiMe2NPh)3]·2.5Et2O(1·2.5Et2O)的形式分离得到硅基亚甲基连接的三氨基膦P(CH2SiMe2NHPh)3,并将其用于钛锆配合物的合成。从1·2.5Et2O开始,制备了氯代配合物[κ4-N,N,N,P-PN3]MCl (4-M, M = Ti, Zr),并对其烷基化反应进行了研究。4-Ti与(三甲基硅基)甲基锂反应后,观察到配体内邻N-苯基上的一个环金属化反应,并分离得到热稳定的钛氮替丁[κ5-N,N,N,P,C-N2P(NC)]Ti (5-Ti)。同样,通过4-Zr与Bn2Mg(THF)2反应,分离得到相关的zirconazetidine [κ5-N,N,N,P,C-N2P(NC)]Zr(THF) (5-Zr)。以LiCH2PMe2为烷基转移试剂,将这两种配合物4-M转化为相应的磷金属环丙烷[κ4-N,N,N,P-PN3]M(κ2-C,P-CH2PMe2) (7-M, M = Ti, Zr)。在温和加热后,配合物7-M被干净地转化为环金属化的5-M和三甲基磷化氢。这些结果在相关的偕胺膦和三偕胺配合物的背景下进行了讨论。
The silylmethylene-linked triamidophosphine P(CH2SiMe2NHPh)3 was isolated in form of its tri-lithium salt Li3[P(CH2SiMe2NPh)3]·2.5Et2O (1·2.5Et2O) and employed for the synthesis of titanium and zirconium complexes. Starting from 1·2.5Et2O, the chlorido complexes [κ4-N,N,N,P-PN3]MCl (4-M, M = Ti, Zr) were prepared and examined with respect to alkylation. Upon reaction of 4-Ti with (trimethylsilyl)methyl lithium, intra-ligand cyclometalation at one of the ortho-N-phenyl positions was observed and the resulting thermally stable titanazetidine [κ5-N,N,N,P,C-N2P(NC)]Ti (5-Ti) isolated. Similarly, the related zirconazetidine [κ5-N,N,N,P,C-N2P(NC)]Zr(THF) (5-Zr) was isolated upon reaction of 4-Zr with Bn2Mg(THF)2. Using LiCH2PMe2 as alkyl transfer reagent, both complexes 4-M were converted to the corresponding phosphametallacyclopropanes [κ4-N,N,N,P-PN3]M(κ2-C,P-CH2PMe2) (7-M, M = Ti, Zr). Upon gentle heating, complexes 7-M were cleanly converted to the cyclometalated species 5-M and trimethylphosphine. These results are discussed in the context of related amidophosphine and triamidoamine complexes.
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