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Your search keyword '"Wang, Congyang"' showing total 22 results
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22 results on '"Wang, Congyang"'

1. Mn-Catalyzed C–C Coupling Reactions

Author

Yang, Yunhui, Wang, Congyang, Beller, Matthias, Series Editor, Dixneuf, Pierre H., Series Editor, Dupont, Jairton, Series Editor, Fürstner, Alois, Series Editor, Glorius, Frank, Series Editor, Gooßen, Lukas J., Series Editor, Nolan, Steven P., Series Editor, Okuda, Jun, Series Editor, Oro, Luis A., Series Editor, Willis, Michael, Series Editor, Zhou, Qi-Lin, Series Editor, and Wu, Xiao-Feng, editor

Published
2023
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5. Highly Efficient Electrosynthesis of Glycine over an Atomically Dispersed Iron Catalyst

Author

Cheng, Yingying, primary, Liu, Shiqiang, additional, Jiao, Jiapeng, additional, Zhou, Meng, additional, Wang, Yiyong, additional, Xing, Xueqing, additional, Chen, Zhongjun, additional, Sun, Xiaofu, additional, Zhu, Qinggong, additional, Qian, Qingli, additional, Wang, Congyang, additional, Liu, Huizhen, additional, Liu, Zhimin, additional, Kang, Xinchen, additional, and Han, Buxing, additional

Published
2024
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16. Manganese‐Catalyzed Hydrogenative Desulfurization of Thioamides.

Author

Wang, Zelong, Chen, Silin, Chen, Chao, Yang, Yunhui, and Wang, Congyang

Subjects
THIOAMIDES, CATALYST poisoning, KETONES, TRANSITION metals, PRECIOUS metals, TRANSFER hydrogenation, SCISSION (Chemistry), DESULFURIZATION
Abstract

Earth‐abundant transition metal catalysis has emerged as an important alternative to noble transition metal catalysis in hydrogenation reactions. However, there has been no Earth‐abundant transition metal catalyzed hydrogenation of thioamides reported so far, presumably due to the poisoning of catalysts by sulfur‐containing molecules. Herein, we described the first manganese‐catalyzed hydrogenative desulfurization of thioamides to amines or imines. The key to success is the use of MnBr(CO)5 instead of commonly‐employed pincer‐manganese catalysts, together with simple NEt3 and CuBr. This protocol features excellent selectivity on sole cleavage of the C=S bond of thioamides, in contrast to the only known Ru‐catalyzed hydrogenation of thioamides, and unprecedented chemo‐selectivity tolerating vulnerable functional groups such as nitrile, ketone, aldehyde, ester, sulfone, nitro, olefin, alkyne and heterocycle, which are usually susceptible to common hydride‐type reductive protocols. [ABSTRACT FROM AUTHOR]

Published
2023
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20. Inert C–H Bond Transformations Enabled by Organometallic Manganese Catalysis

Author

Hu, Yuanyuan, Zhou, Bingwei, and Wang, Congyang

Abstract

Traditional organic synthesis relies heavily on the transformations of various preinstalled functional groups, such as cross-coupling reactions using organohalides and organometallic reagents. The strategy of C–H activation enables the direct formation of C–C/C–X (X = heteroatom) bonds from inert C–H bonds, which can enhance the atom- and step-economy of organic synthesis. To date, precious metals have overwhelmingly dominated the C–H activation field; however, the rarity and high cost of these metals necessitate the development of more sustainable catalysts. In this regard, catalysts based on manganese are highly desirable owing to the abundant reserve of manganese in the earth’s crust and its economic benefits, low toxicity, and potentially unique reactivity. Although the first stoichiometric manganese-mediated C–H activation reaction was reported as early as 1970, manganese-catalyzed C–H activation reactions are largely underdeveloped. How to construct an efficient catalytic cycle for manganese in C–H activation reactions remains as a key issue to be addressed.

Published
2024
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21. 2,3-Arylacylation of allenes through synergetic catalysis of palladium and N-heterocyclic carbene

Author

Gu, Zhao, Yang, Yunhui, Ye, Song, and Wang, Congyang

Abstract

An unprecedented 2,3-arylacylation reaction of allenes with aryl iodides and aldehydes was developed by resorting to Pd/NHC synergetic catalysis. It's the first time that allene was introduced into transition metal and NHC synergetic catalysis, which demonstrated a versatile three-component reaction pattern, thus enabling two C-C bonds forged regioselectively in the reaction. The important reaction intermediates were successfully captured and characterized by HRMS analysis, and the migrative insertion of allene to the Ph-Pd species was identified as the reaction rate-limiting step by kinetic experiments.

Published
2024
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22. C-H Trifluoromethylthiolation of aldehyde hydrazones.

Author

Levet V, Ramesh B, Wang C, and Besset T

Abstract

The selective C-H trifluoromethylthiolation of aldehyde hydrazones afforded interesting fluorinated building blocks, which could be used as a synthetic platform. Starting from readily available (hetero)aromatic and aliphatic hydrazones, the formation of a C-SCF 3 bond was achieved under oxidative and mild reaction conditions in the presence of the readily available AgSCF 3 salt via a one-pot sequential process (28 examples, up to 91% yield). Mechanistic investigations revealed that AgSCF 3 was the active species in the transformation., (Copyright © 2024, Levet et al.)

Published
2024
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