In this study, we investigated the hydrolytic condensation of 3-aminopropyldiethoxymethylsilane over different superacid catalysts. We found that cyclic tetrasiloxanes with different stereostructures (Am-CyTS-NNf₂ and Am-CyTS-NHf₂) could be selectively prepared in high yields (>95%) depending on the superacid catalyst employed (bis(nonafluorobutanesulfonyl)imide or cyclohexafluoropropane-1,3-bis(sulfonyl)imide). The single-crystal X-ray structural analyses of compounds in which amino groups of Am-CyTS-NNf₂ and Am-CyTS-NHf₂ were protected by the tert-butoxycarbonyl group revealed the formation of all-cis and cis–trans–cis cyclic tetrasiloxanes, respectively.

中文翻译：

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根据所用的超强酸催化剂立体选择性合成不同的环状四硅氧烷异构体

在这项研究中，我们研究了 3-氨基丙基二乙氧基甲基硅烷在不同超强酸催化剂上的水解缩合。我们发现具有不同立体结构的环状四硅氧烷（Am-CyTS-NNf ₂和 Am-CyTS-NHf ₂）可以选择性地以高产率（> 95％）制备，具体取决于所使用的超强酸催化剂（双（九氟丁磺酰基）亚胺或环六氟丙烷- 1,3-双(磺酰基)亚胺)。 Am-CyTS-NNf ₂和 Am-CyTS-NHf ₂的氨基受叔丁氧羰基保护的化合物的单晶X射线结构分析揭示了全顺式和顺式-反式-顺式的形成分别为环状四硅氧烷。