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首页> 外文期刊>Acta Crystallographica, Section B. Structural science, crystal engineering and materials >Searching for stereoisomerism in crystallographic databases: algorithm, analysis and chiral curiosities
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Searching for stereoisomerism in crystallographic databases: algorithm, analysis and chiral curiosities

机译:在晶体数据库中寻找立体异构性:算法,分析和手性技巧

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摘要

The automated identification of chiral centres in molecular residues is a nontrivial task. Current tools that allow the user to analyze crystallographic data entries do not identify chiral centres in some of the more complex ring structures, or lack the possibility to determine and compare the chirality of multiple structures. This article presents an approach to identify asymmetric C atoms, which is based on the atomic walk count algorithm presented by Rü cker &Rü cker [(1993), J. Chem. Inf. Comput. Sci. 33, 683-695]. The algorithm, which we implemented in a computer program named ChiChi, is able to compare isomeric residues based on the chiral centres that were identified. This allows for discrimination between enantiomers, diastereomers and constitutional isomers that are present in crystallographic databases. ChiChi was used to process 254 354 organic entries from the Cambridge Structural Database (CSD). A thorough analysis of stereoisomerism in the CSD is presented accompanied by a collection of chiral curiosities that illustrate the strength and versatility of this approach.
机译:分子残留中的手性中心的自动识别是一个非活动任务。允许用户分析晶体数据条目的当前工具在一些更复杂的环结构中不识别手性中心,或缺乏确定和比较多个结构的手性的可能性。本文介绍了一种识别不对称C原子的方法,该方法是基于Rücker&rücker呈现的原子步行计数算法[(1993),J.Chem。 INF。计算。 SCI。 33,683-695]。我们在名为Chichi的计算机程序中实现的算法能够基于所识别的手性中心比较异构体残留物。这允许在晶体数据库中存在的对映体,非对映异构体和构成异构体之间的歧视。 Chichi用于处理剑桥结构数据库(CSD)的254 354有机条目。彻底分析了CSD中的立体异构主义,并伴随着一种手段采用的集合,说明了这种方法的强度和多功能性。

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