Single-Handed Double Helix and Spiral Platelet Formed by Racemate of Dissymmetric Cages was written by Liu, Xiaoning;Shi, Zheng;Xie, Mingchen;Xu, Jianping;Zhou, Zhifan;Jung, Sinyeong;Cui, Guijia;Zuo, Yong;Li, Tao;Yu, Chunyang;Liu, Zhiqiang;Zhang, Shaodong. And the article was included in Angewandte Chemie, International Edition in 2021.Application of 96761-85-2 This article mentions the following:
Spontaneous deracemization has been used to sep. homochiral domains from the racemic system. However, homochirality can only be referred to when the scales of these domains and systems are specified. To clarify this, we report self-assembly of racemates of dissym. cages DC-1 (I) with a cone-shape propeller geometry, forming a centrosym. columnar crystalline phase (racemic at crystallog. level). Owing to their anisotropic geometry, the two enantiomers are packed in a frustrated fashion in this crystalline phase; single-handed double helixes are observed (single-handedness at supramol. level). The frustrated packing (layer continuity break-up) in turn facilitates screw dislocation during the crystal growth, forming left- or right-handed spiral platelets (symmetry-breaking at morphol. level), although each platelet is composed of DC-1 racemates. The symmetry correlation between DC-1 mols., the crystalline phase and spiral platelets, all exhibit C3 symmetry. In the experiment, the researchers used many compounds, for example, 3,3”-Dibromo-5′-(3-bromophenyl)-1,1′:3′,1”-terphenyl (cas: 96761-85-2Application of 96761-85-2).
3,3”-Dibromo-5′-(3-bromophenyl)-1,1′:3′,1”-terphenyl (cas: 96761-85-2) belongs to organobromine compounds. Most of the natural organobromine compounds are produced by marine organisms, and several brominated metabolites with antibacterial, antitumor, antiviral, and antifungal activity have been isolated from seaweed, sponges, corals, molluscs, and others. Many of the alkyl bromine derivatives are excellent alkylating agents since bromides are good leaving groups. Tribromides, like tetrabutylammonium tribromide, are used as a solid source of bromine. N-bromosuccimide (NBS) is used for the selective bromination of allylic bonds.Application of 96761-85-2
Referemce:
Bromide – Wikipedia,
bromide – Wiktionary