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首页> 外文期刊>Russian Chemical Bulletin >Mono-C,O-chelated bromo- and triflatosilanes with an amino acid moiety: salts or covalently bonded complexes?
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Mono-C,O-chelated bromo- and triflatosilanes with an amino acid moiety: salts or covalently bonded complexes?

机译：用氨基酸部分：盐或共价键合复合物的单℃，O形螯合溴和三氟硅烷蛋白？

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Derivatives of the amino acids sarcosine and proline - triflates TsN(Me)CH2C(O)N(Me)-CH2SiMe2OTf and Ns-Pro-N(Me)CH2SiMe2OTf (Ns is 4-NO2C6H4SO2) - were synthesized by the reaction of trimethylsilyl triflate with halosilanes prepared previously. Bromide NsNHCH(Me)C(O)N(Me)CH2SiMe2Br was synthesized by the cleavage of the Si-O-Si moiety of the appropriate disiloxane with excess acetyl bromide. The X-ray diffraction study of these compounds and of the previously characterized bromide TsN(Ac)CH2C(O)N(Me) CH2SiMe2Br showed that the Si-O coordination bond lengths in the triflates are 1.7692(14)-1.8623(14) angstrom. The interatomic distances between the bromine and silicon atoms are 2.7095(8) and 2.9704(7) angstrom, which indicates that these bonds are weak. To elucidate the nature of Si ... X bonding (X = OTf, Br), the topological analysis of electron density was performed and Si-29 NMR chemical shifts were calculated. The interatomic Si ... X interaction in triflate TsN(Me)CH2C(O)-N(Me)CH2SiMe2OTf and bromide TsN(Ac)CH2C(O)N(Me)CH2SiMe2Br is weak. In triflate Ns-Pro-N(Me)CH2SiMe2OTf and bromide NsNHCH(Me)C(O)N(Me) CH2 SiMe2Br, the Si ... X interaction is significantly stronger and corresponds to a weak coordination bond. Hence, the tosylates can be considered as salts, whereas the para-nitrobenzenesulfonyl derivatives are monochelated five-coordinate silicon complexes.
机译：通过三甲基甲硅烷基三氟甲磺酸盐的反应合成氨基酸肌氨酸和脯氨酸 - Triflate TSN（ME）CH 2 C（O）N（ME）CH2SIME2OTF（NS-PRO-N（ME）CH2SIME2OTF（NS-PRO-N（ME）CH2SIME2OTF（NS-PRO-N） - 通过Timethylsilf Triflate的反应合成以前制备的卤代硅烷。溴化物NSNHCH（ME）C（O）N（ME）CH2SIME2BR通过用过量的乙酰溴的Si-O-Si部分的切割合成。这些化合物的X射线衍射研究和先前表征的溴化物TSN（AC）CH 2 C（O）N（ME）CH2Sime2BR显示，三氟甲酸盐中的Si-O配位键长度为1.7692（14）-1.8623（14）埃。溴和硅原子之间的间隙距离为2.7095（8）和2.9704（7）埃，表明这些键是薄弱的。为了阐明Si ... X键合的性质（X = OTF，BR），进行了电子密度的拓扑分析，并计算了Si-29 NMR化学变换。 Triflate Tsn（Me）CH 2 C（O）-N（ME）CH2Sime2OTF和溴化物TSN（AC）CH 2 C（O）N（ME）CH2SIME2BR中的间隙Si ... x相互作用。在Triflate NS-Pro-N（ME）CH2Sime2OTF和溴化物NSNHCH（ME）C（O）N（ME）CH2 SIME2BR中，Si ... X相互作用显着较强并且对应于弱的配位键。因此，甲苯磺酸盐可以被认为是盐，而对硝基苯磺酰基衍生物是单层五坐标硅配合物。

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