Tridentate Lewis Acids Based on 1,3,5-Trisilacyclohexane Backbones and an Example of Their Host-Guest Chemistry.

Tridentate Lewis Acids Based on 1,3,5-Trisilacyclohexane Backbones and an Example of Their Host-Guest Chemistry.
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基于 1,3,5-三硅杂环己烷主链的三齿路易斯酸及其主客体化学示例

DOI:
10.1002/chem.201501683
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发表时间:
2015
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--
通讯作者:
N. W. Mitzel
N. W. Mitzel
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--
文献类型:
--
作者:
E. Weisheim;C. G. Reuter;P. Heinrichs;Y. V. Vishnevskiy;A. Mix;B. Neumann;H.-G. Stammler;N. W. Mitzel

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合成了一种以1,3,5-三硅杂环己烷为骨架,含三个乙炔基的定向三齿刘易斯酸[CH_2Si(Me)(C_2 H)]_3,并通过与HB(C_6 F_5)_2硼氢化反应得到乙烯基硼烷{CH_2Si(Me)[C_2 H_2B(C_6 F_5)_2]}_3,再与有机镓和铟金属化得到{CH_2Si(Me)[C_2 M(R)_2]}_3(M=Ga,In,R=Me,Et).在骨架的合成中,研究了取代基(Si上的MeO、EtO和PrO基团)对甲基取向的影响,目的是增加全顺式异构体的丰度。通过元素分析、多核NMR光谱和某些情况下的IR光谱鉴定了新化合物。得到了cis-trans-[CH 2Si(Me)(Cl)]3、all-cis-[CH 2Si(Me)(H)]3、all-cis-[CH 2Si(Me)(C2 H)]3、cis-trans-[CH 2Si(Me)(C2 H)] 3和all-cis-[CH 2Si(Me)(C2 SiMe 3)]3的晶体结构。全顺式[CH 2Si(Me)(C2 H)] 3的气相电子衍射实验提供了关于全赤道和全轴形式的相对稳定性的信息;第一种在固相和气相中都优选。在NMR滴定实验中使镓基刘易斯酸{CH 2Si(Me)[C2 Ga(Et)2]} 3与三齿刘易斯碱(1,3,5-三甲基-1,3,5-三氮杂环己烷)反应。通过DOSY NMR光谱法,通过将测量的扩散系数与相同大小和形状的合适参比化合物的扩散系数进行比较,鉴定在该反应期间参与平衡的生成的主体-客体复合物。
Directed tridentate Lewis acids based on the 1,3,5‐trisilacyclohexane skeleton with three ethynyl groups [CH2Si(Me)(C2H)]3were synthesised and functionalised by hydroboration with HB(C6F5)2, yielding the ethenylborane {CH2Si(Me)[C2H2B(C6F5)2]}3, and by metalation with gallium and indium organyls affording {CH2Si(Me)[C2M(R)2]}3(M=Ga, In, R=Me, Et). In the synthesis of the backbone the influence of substituents (MeO, EtO andiPrO groups at Si) on the orientation of the methyl group was studied with the aim to increase the abundance of the all‐cisisomer. New compounds were identified by elemental analyses, multi‐nuclear NMR spectroscopy and in some cases by IR spectroscopy. Crystal structures were obtained forcis‐trans‐[CH2Si(Me)(Cl)]3, all‐cis‐[CH2Si(Me)(H)]3, all‐cis‐[CH2Si(Me)(C2H)]3,cis‐trans‐[CH2Si(Me)(C2H)]3and all‐cis‐[CH2Si(Me)(C2SiMe3)]3. A gas‐phase electron diffraction experiment for all‐cis‐[CH2Si(Me)(C2H)]3provides information on the relative stabilities of the all‐equatorial and all‐axial form; the first is preferred in both solid and gas phase. The gallium‐based Lewis acid {CH2Si(Me)[C2Ga(Et)2]}3was reacted with a tridentate Lewis base (1,3,5‐trimethyl‐1,3,5‐triazacyclohexane) in an NMR titration experiment. The generated host–guest complexes involved in the equilibria during this reaction were identified by DOSY NMR spectroscopy by comparing measured diffusion coefficients with those of the suitable reference compounds of same size and shape.
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