Synthesis of Oligosilanyl Compounds of Group 4 Metallocenes with the Oxidation State +3.

Synthesis of Oligosilanyl Compounds of Group 4 Metallocenes with the Oxidation State +3.
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DOI:
10.1021/om3001873
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发表时间:
2012-06-11
期刊:
影响因子:
2.8
通讯作者:
Müller T
Müller T
中科院分区:
化学2区
文献类型:
--
作者:
Arp H;Zirngast M;Marschner C;Baumgartner J;Rasmussen K;Zark P;Müller T

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最近,我们表明,钛茂甲硅烷基与氧化态+3的钛更稳定。目前的研究表明,类似的锆和铪化合物也可以通过合适的金属化物前体与低聚硅烷基二价阴离子的反应得到。由于所获得的配合物形式上具有d1电子构型,因此使用EPR光谱对其进行了研究。相应的光谱表明,该化合物可以被认为也表现出一些环硅烷基自由基阴离子的字符。为了理解二甲硅烷基化的钛(IV)茂对还原消除的强烈偏好,对这些反应的热力学进行了理论研究,揭示了这种行为本质上是由弱Si-Ti(IV)键引起的。
Recently, we showed that titanocene silyls are much more stable with Ti in the oxidation state +3. The current study demonstrates that analogous Zr and Hf compounds can also be obtained by reaction of a suitable metalate precursor with an oligosilanyl dianion. As the obtained complexes formally possess a d1 electron configuration, they were investigated using EPR spectroscopy. The corresponding spectra indicate that the compounds can be considered to also exhibit some cyclosilanyl radical anion character. In order to understand the strong preference of disilylated titan(IV)ocenes for reductive elimination, a theoretical study of the thermodynamics of these reactions was conducted, revealing that this behavior is essentially caused by the weak Si–Ti(IV) bond.
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