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4 results on '"Hengchi He"'

1. Highly selective synthesis of all-carbon tetrasubstituted alkenes by deoxygenative alkenylation of carboxylic acids

Author

Yantao Li, Qianzhen Shao, Hengchi He, Chengjian Zhu, Xiao-Song Xue, and Jin Xie

Subjects
Science
Abstract

Tetrasubstituted olefins have been explored as chemical synthons and can sometime have useful photophysical properties, but are sometimes difficult to synthesize with high selectivity in mild conditions. Here the authors present a method to make tetrasubstituted olefins via dual photo- and nickel catalysis, without the need for an inert atmosphere.

Published
2022
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2. Photoredox/nickel-catalyzed hydroacylation of ethylene with aromatic acids

Author

Shuai Chen, Chengjian Zhu, Jin Xie, Hengchi He, Weipeng Li, and Lili Zhang

Subjects
Ethylene, Chemistry, Metals and Alloys, Photoredox catalysis, chemistry.chemical_element, Hydroacylation, General Chemistry, Synergistic combination, Raw material, Catalysis, Surfaces, Coatings and Films, Electronic, Optical and Magnetic Materials, Nickel, chemistry.chemical_compound, Temperature and pressure, Materials Chemistry, Ceramics and Composites, Organic chemistry
Abstract

We report a general, practical and scalable hydroacylation reaction of ethylene with aromatic carboxylic acids with the synergistic combination of nickel and photoredox catalysis. Under ambient temperature and pressure, feedstock chemicals such as ethylene can be converted into high-value-added aromatic ketones in moderate to good yields (up to 92%) with reaction time of 2–6 hours.

Published
2021

3. Visible-Light-Mediated Deoxyalkynylation of Activated Tertiary Alcohols

Author

Tao Liu, Jiajun Li, Haotian Dai, Hengchi He, Muzi Li, and Jin Xie

Subjects
Reaction conditions, Alkynylation, Chemistry, Reagent, Organic Chemistry, Photocatalysis, Tertiary alcohols, Combinatorial chemistry, Visible spectrum, Quaternary carbon
Abstract

In this paper, visible-light-induced deoxyalkynylation of activated tertiary alcohols has been successfully performed under mild reaction conditions with ethynylbenziodoxole as the readily available alkynylation reagent. The desired C(sp3)-C(sp) coupling can smoothly occur with 4-CzIPN as a photocatalyst, affording a wide range of valuable alkynylation products bearing quaternary carbon centers in 37-84% yields.

Published
2021

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