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294 results on '"Tse, Man Kin"'

1. Acid-catalyzed regioselective remote heteroarylation of alkenes via C＝C bond migration.

Author

Qin, Shengxiang, Zhang, Yaqi, Jiang, Long, Tse, Man Kin, Chan, Albert S. C., and Qiu, Liqin

Subjects
COPPER, FUNCTIONAL groups, ALKENES, ALKANES
Abstract

We report herein the acid-catalyzed regioselective remote heteroarylation and reductive alkylation of alkenes. Various alkenes, including mono-, di-, and tri-substituted alkenes and cyclic alkenes, are applicable to this reaction. This method exhibits broad substrate scope, high functional group tolerance and high atomic economy. In addition, both gram-scale synthesis and product transformations demonstrate the potential utility of this reaction. It also provides an efficient and novel pathway to establish the valuable framework of 1,1-diaryl alkanes. Further mechanistic studies suggested that TfOH in situ generated by Cu(OTf)2 and trace H2O catalyzed the alkene migration. Then, heteroarylation was conducted by Friedel–Crafts type alkylation. [ABSTRACT FROM AUTHOR]

Published
2024
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3. [24]Crown-8-modified carbon nanotubes for templating metal deposition and active materials for pseudocapacitors

Author

Ruitao Zhou, Albert S. C. Chan, Chen Yujie, Fung-Kit Tang, Shengzhou Chen, Xunjin Zhu, Tse Man Kin, Ken Cham-Fai Leung, and Raymond Wai-Yin Sun

Subjects
Materials science, medicine.medical_treatment, Electroless deposition, chemistry.chemical_element, 02 engineering and technology, Carbon nanotube, 010402 general chemistry, 021001 nanoscience & nanotechnology, 01 natural sciences, Crown (dentistry), 0104 chemical sciences, law.invention, Metal deposition, Nickel, Modified carbon, chemistry, Chemical engineering, Chemistry (miscellaneous), law, Pseudocapacitor, medicine, General Materials Science, 0210 nano-technology
Abstract

A uniform nickel film could be coated on crown ether-modified carbon nanotubes (c-CNTs) by electroless deposition. The products CNT@Ni and c-CNT@Ni were oxidized and compressed into CNT@Ni@(NiOH)2 and c-CNT@Ni@(NiOH)2 discs, respectively. The areal and volumetric capacitances of CNT@Ni@(NiOH)2 and c-CNT@Ni@(NiOH)2 were compared and c-CNT@Ni@(NiOH)2 showed a lower resistance.

Published
2021
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17. Nickel‐Catalyzed Decarbonylative Cycloaddition of Benzofuran‐2,3‐diones with Alkynes to Flavones.

Author

Zhang, Yu‐Yang, Li, Han, Jiang, Xiaoding, Subba Reddy, Chitreddy V, Liang, Hao, Zhang, Yaqi, Cao, Rihui, Sun, Raymond Wai‐Yin, Tse, Man Kin, and Qiu, Liqin

Subjects
ALKYNES, RING formation (Chemistry), PHENYL group, FLAVONES, ACETYLENE
Abstract

Using dppe as the ligand, the Nickel‐catalyzed decarbonylative cycloaddition of benzofuran‐2,3‐diones with alkynes was established, and a variety of functional flavones were synthesized in 65–99% yields. Terminal alkynes with substituted phenyl groups and internal alkynes such as aryl acyl acetylenes and diphenylacetylenes are suitable for this reaction. The effects of bases on the reactions of different types of alkyne substrates were also investigated and discussed. [ABSTRACT FROM AUTHOR]

Published
2022
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18. Synthesis of beta-mono-, tetra-, and octasubstituted sterically bulky porphyrins via Suzuki cross coupling

Author

Zhou, Xiang, Tse, Man Kin, Wan, Terence S.M., and Chan, Kin Shing

Subjects
Organometallic compounds -- Research, Porphyrins -- Research, Biological sciences, Chemistry
Abstract

Suzuki cross coupling reactions between beta-bromotetramesitylporphyrins and aryl- and methylboronic acids were performed to synthesize sterically constrained beta-mono-, tetra-, and octasubstituted tetramesitylporphyrins of the type H2TMP(R)n where n = 1,4,8 and R = Me, Ar. The experiments, which used Pd(PPh3)4 as a catalyst, were carried out in anhydrous K2CO3 in toluene or toluene/THF solution at 90-100 degrees Celsius.

Published
1996

23. A Highly Efficient Chiral-Bridged Diphosphine Ligand Modified Cationic Palladium(II) Catalyst System for Asymmetric Alternating Copolymerization of Propene and Carbon Monoxide

Author

Yuming Cui, Fuk Yee Kwong, Tse Man Kin, Lailai Wang, and Albert S. C. Chan

Subjects
Ligand, Organic Chemistry, Cationic polymerization, chemistry.chemical_element, Monoxide, Photochemistry, Catalysis, Propene, chemistry.chemical_compound, chemistry, Polyketone, Polymer chemistry, Carbon monoxide, Palladium
Abstract

A highly efficient chiral-bridged biphenyl diphosphine ligand [(R ax )-BuP] modified cationic palladium(II) catalyst system for the synthesis of optically active polyketone by stereoselective alternating copolymerization ofpropene and carbon monoxide is reported for the first time. The results show that [Pd(MeCN) 4 ][OTf] 2 is an excellent catalyst precursor in a mixed solvent of MeNO 2 -MeOH. The highest catalytic activity was found to be 221 g polymer/(g Pd·h). A chiral polyketone with molecular weight M n = 2.9 × 10 4 , polydispersity = 1.4, and molar optical rotation = +37° was afforded under optimized reaction conditions.

Published
2009
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