Angewandte Chemie International Edition

Dai, Fangna; Wang, Xiaokang; Wang, Yutong; Liu, Zhanning; Sun, Daofeng

doi: 10.1002/anie.202085061pmid: N/A

Choi, Hangyeol; Kim, Myojeong; Jang, Jaebong; Hong, Sungwoo

doi: 10.1002/anie.202085062pmid: N/A

Pang, Yadong; Lee, Joo Won; Kubota, Koji; Ito, Hajime

doi: 10.1002/anie.202013779pmid: N/A

Schulte, Thorben R.; Holstein, Julian J.; Schneider, Laura; Adam, Abdulselam; Haberhauer, Gebhard; Clever, Guido H.

doi: 10.1002/anie.202013825pmid: N/A

doi: 10.1002/anie.202085011pmid: N/A

Egorova, Ksenia S.; Galushko, Alexey S.; Ananikov, Valentine P.

doi: 10.1002/anie.202003082pmid: 33002316

In this Essay, we present a critical analysis of two common practices in modern chemistry—that is, of using speculations about the “greenness” and “nontoxicity” of developed synthesis procedures and of a priori labelling various compounds derived from natural sources as being environmentally safe. We note that every organic molecule that contains functional groups should be biologically active. Thus, analysis of the particular greenness and the potential environmental impact of a given chemical process should account for the biological activity of all its components in a measureable (rather than empirical) way. We highlight the necessity of clarifying discussions on biological activity and toxicity and propose possible ways of introducing tox‐Profiles as a reliable overview of the overall toxicity of chemical reactions.

Kolb, Simon; Oliver, Gwyndaf A.; Werz, Daniel B.

doi: 10.1002/anie.202007314pmid: 32969111

Chalcogen bonding is important in numerous aspects of chemistry, both in the solid state and in solution. Surveying the literature, it becomes clear that during its rebranding from chalcogen–chalcogen interactions, some parts of the community have somewhat neglected to recall its discovery and the initial studies referring to it in its previous guise. In this Viewpoint, we trace the path of research into this phenomenon, from its discovery, through its renaming, and to some of the varied and interesting chemistry it has led to so far, ranging from crystal engineering through supramolecular assembly to modern catalysis.

Shu, Yufei; Lin, Xing; Qin, Haiyan; Hu, Zhuang; Jin, Yizheng; Peng, Xiaogang

doi: 10.1002/anie.202004857pmid: 32421230

This article offers a materials‐chemistry perspective for colloidal quantum dots (QDs) in the field of display, including QD‐enhanced liquid‐crystal‐display (QD‐LCD) and QD‐based light‐emitting‐diodes (QLEDs) display. The rapid successes of QDs for display in the past five years are not accidental but have a deep root in both maturity of their synthetic chemistry and their unique chemical, optical, and optoelectronic properties. This article intends to discuss the natural match of QD emitters for display and chemical means to eventually bring about their full potential.

Hoveyda, Amir H.; Liu, Zhenxing; Qin, Can; Koengeter, Tobias; Mu, Yucheng

doi: 10.1002/anie.202010205pmid: 32881222

Ethylene is the byproduct of olefin metathesis reactions that involve one or more terminal alkenes. Its volatility is one reason why many cross‐metathesis or ring‐closing metathesis processes, which are reversible transformations, are efficient. However, because ethylene can be converted to a methylidene complex, which is a highly reactive but relatively unstable species, its concentration can impact olefin metathesis in other ways. In some cases, introducing excess ethylene can increase reaction rate owing to faster catalyst initiation. Ethylene and a derived methylidene complex can also advantageously inhibit substrate or product homocoupling, and/or divert a less selective pathway. In other instances, a methylidene's low stability and high activity may lead to erosion of efficiency and/or kinetic selectivity, making it preferable that ethylene is removed while being generated. If methylidene decomposition is so fast that there is little or no product formation, it is best that ethylene and methylidene complex formation is avoided altogether. This is accomplished by the use of di‐ or trisubstituted alkenes in stereoretentive processes, which includes adopting methylene capping strategy. Here, we analyze the different scenarios through which ethylene and the involvement of methylidene complexes can be manipulated and managed so that an olefin metathesis reaction may occur more efficiently and/or more stereoselectively.

Haase, Frederik; Hirschle, Patrick; Freund, Ralph; Furukawa, Shuhei; Ji, Zhe; Wuttke, Stefan

doi: 10.1002/anie.201914461pmid: 32449245

Reticular materials are of high interest for diverse applications, ranging from catalysis and separation to gas storage and drug delivery. These open, extended frameworks can be tailored to the intended application through crystal‐structure design. Implementing these materials in application settings, however, requires structuring beyond their lattices, to interface the functionality at the molecular level effectively with the macroscopic world. To overcome this barrier, efforts in expressing structural control across molecular, nano‐, meso‐, and bulk regimes is the essential next step. In this Review, we give an overview of recent advances in using self‐assembly as well as externally controlled tools to manufacture reticular materials over all the length scales. We predict that major research advances in deploying these two approaches will facilitate the use of reticular materials in addressing major needs of society.