Bis(methylidene) complex of tantalum supported by a PNP ligand
Bis(methylidene) complex of tantalum supported by a PNP ligand
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DOI：
10.1021/om700715s
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发表时间：
2007-09-24
期刊：
影响因子：
2.8
通讯作者：
Ozerov, Oleg V.
中科院分区：
文献类型：
--
作者：
Gerber, Laura C. H.;Watson, Lori A.;Ozerov, Oleg V.
（PNP）Li与TaF5反应生成五方双锥体（PNP）TaF4(2)。2与MeMgBr的烷基化允许（PNP）TaMe4(3)的分离。（PNP）TaMe4(3)在热和/或光化学上演变成双（甲基）配合物（PNP）Ta(=CH2)(2)(4)。后者的识别已通过x射线结构，核磁共振光谱和DFT计算研究建立。4在溶液中似乎不具有有机相互作用。
Reaction of (PNP)Li with TaF5 produces pentagonalbipyramidal (PNP)TaF4 (2). Alkylation of 2 with MeMgBr allows for the isolation of (PNP)TaMe4 (3). (PNP)TaMe4 (3) evolves thermally and/or photochemically into a bis(methylidene) complex (PNP)Ta(=CH2)(2) (4). The identify of the latter has been established by X-ray structural, NMR spectroscopic, and DFT computational studies. It does not appear that 4 possesses agostic interactions in solution.