Identifying a Hidden Conglomerate Chiral Pool in the CSD

Walsh, Mark P.; Barclay, James A.; Begg, Callum S.; Xuan, Jinyi; Johnson, Natalie T.; Cole, Jason C.; Kitching, Matthew O.

Abstract

Conglomerate crystallization is the spontaneous generation of individually enantioenriched crystals from a nonenantioenriched material. This behavior is responsible for spontaneous resolution and the discovery of molecular chirality by Pasteur. The phenomenon of conglomerate crystallization of chiral organic molecules has been left largely undocumented, with no actively curated list available in the literature. While other crystallographic behaviors can be interrogated by automated searching, conglomerate crystallizations are not identified within the Cambridge Structural Database (CSD) and are therefore not accessible by conventional automated searching. By conducting a manual search of the CSD and literature, a list of over 1800 chiral species capable of conglomerate crystallization was curated by inspection of the racemic synthetic routes described in each publication. The majority of chiral conglomerate crystals are produced and published by synthetic chemists who seldom note and rarely exploit the implications this phenomenon can have on the enantiopurity of their crystalline materials. With their structures revealed, we propose that this list of compounds represents a new chiral pool which is not tied to biological sources of chirality.

Citation

Walsh, M. P., Barclay, J. A., Begg, C. S., Xuan, J., Johnson, N. T., Cole, J. C., & Kitching, M. O. (2022). Identifying a Hidden Conglomerate Chiral Pool in the CSD. JACS Au, 2(10), 2235-2250. https://doi.org/10.1021/jacsau.2c00394

• Journal Article Type: Article
• Acceptance Date: Sep 12, 2022
• Online Publication Date: Sep 23, 2022
• Publication Date: 2022
• Deposit Date: Oct 26, 2022
• Publicly Available Date: Oct 26, 2022
• Journal: JACS Au
• Print ISSN: 2691-3704
• Electronic ISSN: 2691-3704
• Publisher: American Chemical Society
• Peer Reviewed: Peer Reviewed
• Volume: 2
• Issue: 10
• Pages: 2235-2250
• DOI: https://doi.org/10.1021/jacsau.2c00394
• Public URL: https://durham-repository.worktribe.com/output/1187434