Investigation on the weak interactions assembling the crystal structures of Betti bases
作者:Cosimo Cardellicchio、Maria Annunziata M. Capozzi、Angel Alvarez-Larena、Joan F. Piniella、Francesco Capitelli
DOI:10.1039/c2ce06295j
日期:——
The crystal structures of (S, S)-aminobenzylnaphthols, easily produced by a chromatography-free highly stereoselective Betti reaction, were investigated by means of single crystal X-ray diffraction analysis, and the main intra- and intermolecular interactions were described. The presence of a strong intramolecular hydrogen bond was confirmed, whereas the whole crystal building was found to be due mainly to other bondings, such as CH⋯O and CH⋯π interactions. As far as the last interactions were concerned, we observed many short distances from one hydrogen atom to an aryl plane, together with the appropriate geometric requirements for the assemblies. The observations suggest that these interactions can play a relevant role in the crystal building. The absence of similar short distance CH⋯π interactions in the crystal of a diastereomeric (R, S)-aminobenzylnaphthol could be a suggestion of the preferential crystallisation of the (S, S)-stereoisomer and, consequently, its prevalence as a product of the Betti reaction.
通过单晶 X 射线衍射分析,研究了通过无色谱法高立体选择性贝蒂反应轻松制备的 (S, S) - 氨基苄基萘酚的晶体结构,并描述了主要的分子内和分子间相互作用。证实了分子内氢键的存在,同时发现整个晶体结构主要是由于其他键,如 CH⋯O 和 CH⋯π 相互作用造成的。就最后一种相互作用而言,我们观察到从一个氢原子到一个芳基平面之间的许多短距离,以及组装的适当几何要求。这些观察结果表明,这些相互作用在晶体结构中起着重要作用。非对映异构体(R,S)-氨基苄基萘酚的晶体中没有类似的 CH⋯π 短距离相互作用,这表明(S,S)-非对映异构体优先结晶,因此,它是贝蒂反应的主要产物。