Synthesis of Group 4 Organometallic Complexes That Contain the Bis(borylamide) Ligand [Mes2BNCH2CH2NBMes2]2-

Synthesis of Group 4 Organometallic Complexes That Contain the Bis(borylamide) Ligand [Mes2BNCH2CH2NBMes2]2-
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含有双(硼酰胺)配体 [Mes2BNCH2CH2NBMes2]2- 的第 4 族有机金属配合物的合成

DOI:
10.1021/om950646d
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发表时间:
1996
期刊:
影响因子:
2.8
通讯作者:
W. M. Davis
W. M. Davis
中科院分区:
化学2区
文献类型:
--
作者:
T. H. Warren;R. Schrock;W. M. Davis

文献摘要

被引文献

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通过用(Ben)Mg(THF)2处理MCl 4(THF)2(M = Ti,Zr),制备了新的螯合双(硼酰氨基)配体[Mes 2BNCH 2CH 2NBMes 2]2-([Ben]2-)的钛和锆衍生物。在(Ben)TiCl 2和(Ben)ZrCl 2(THF)中,氮-硼π相互作用导致每个BMes 2单元中的一个均三甲苯基基团大致占据MCl 2平面上方和下方的空间。(Ben)TiCl_2在二氯甲烷中被格氏试剂顺利烷基化,得到(Ben)Ti(R)Cl(R = CH_2 Ph,CH_2CMe_3)和(Ben)TiR_2(R = Me,CH_2 Ph),而(Ben)ZrCl_2(THF)和甲基锂在甲苯中可制得不稳定的(Ben)ZrMe_2。对(Ben)Ti(CH 2 Ph)Cl的X射线研究证实了所提出的配体构象,并具有高度扭曲的“η2”苄基配体,其Ti−Cα−Cipso角仅为87.0(5)°。(Ben)MMe 2络合物通过在室温下(对于Zr)或在加热时(对于Ti)金属化来自不同硼上的均三甲苯环的邻位甲基而干净地分解。(TwistBen)Zr的X射线晶体结构表明它是一种二聚体,其中两个锆石...
Titanium and zirconium derivatives of the new chelating bis(borylamido) ligand [Mes2BNCH2CH2NBMes2]2- ([Ben]2-) are prepared by treating MCl4(THF)2 (M = Ti, Zr) with (Ben)Mg(THF)2. Nitrogen−boron π-interactions in (Ben)TiCl2 and (Ben)ZrCl2(THF) result in one mesityl group in each BMes2 unit occupying space roughly above and below the MCl2 plane. (Ben)TiCl2 is smoothly alkylated by Grignard reagents in dichloromethane to give (Ben)Ti(R)Cl (R = CH2Ph, CH2CMe3) and (Ben)TiR2 (R = Me, CH2Ph), while unstable (Ben)ZrMe2 can be prepared from (Ben)ZrCl2(THF) and methyllithium in toluene. An X-ray study of (Ben)Ti(CH2Ph)Cl confirms the proposed ligand conformation and features a highly distorted “η2” benzyl ligand with a Ti−Cα−Cipso angle of only 87.0(5)°. (Ben)MMe2 complexes cleanly decompose by metalation of the ortho methyl groups from mesityl rings on different borons at room temperature (for Zr) or upon heating (for Ti). An X-ray crystal structure of (TwistBen)Zr shows it to be a dimer in which the two zircon...