Concise methods for the synthesis of chiral polyoxazolines and their application in asymmetric hydrosilylation

The current status of rhodium-catalyzed hydrosilylation of ketones is reviewed, focusing on development milestones leading to state of the art chiral ligand systems and mechanistic understanding. Four ligand classes are discussed: phosphorus-, nitrogen-, mixed-donor ligand-as well as N-heterocyclic carbene-based ligand systems. Results relevant for a mechanistic understanding of the reaction are presented, starting from the initial investigations by Ojima, limitations of the first mechanistic picture leading to the Zheng-Chan mechanism, which was recently replaced by a silylene-based mechanism introduced by Hofmann and Gade.

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“…More nitrogen-based ligands have been developed, and the most promising ones are shown in Figure . − …”

Section: Catalyst Developmentmentioning

confidence: 99%

Rhodium-Catalyzed Hydrosilylation of Ketones: Catalyst Development and Mechanistic Insights

et al. 2012

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“…[ 53 ] Achieving this kind of structure relies on obtaining stereochemical rigid structures with high configurational stability, thus avoiding racemization processes. [ 54 ] To date, a variety of twisted nanographene structures have been successfully synthesized and confirmed. Based on different chiral twisted structures, they can be categorized into helical and propeller‐like structures among others (Table 1).…”

Section: Chiral Twisted Nanographenementioning

confidence: 99%

Chiral twisted molecular carbons: Synthesis, properties, and applications

Zhang,

Guan,

Luo

et al. 2024

Interdisciplinary Materials

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In recent years, the precisely controlled synthesis of chiral twisted molecular carbons has emerged as a forefront topic in the research of carbon materials. Molecular carbons refer to carbon nanomaterials synthesized with precision at the atomic level. Through rational design, rigid and stable chiral twisted structures can be synthesized. The exploration in the field of chiral twisted molecular carbons is key to fully understanding the various twisted configurations of carbon materials and delving into the relationship between structure design and functionality. This review explores chiral twisted configurations of carbon nanomaterials such as nanographene, carbon nanobelts, carbon nanosheets, graphdiyne, etc. It emphasizes the role of photocyclization, Scholl reaction, and Diels–Alder reactions in achieving precise chiral control and discusses a range of innovative design strategies. These strategies have led to the development of various twisted structures, such as helical, propeller, and Möbius strip configurations. The introduction of chirality, combined with the inherent exceptional optical properties of nanocarbon materials, has facilitated the creation of materials with superior chiroptical performances. This advancement is driving applications in fields such as optoelectronics and chiral optics.

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