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23 results on '"CHEN Kang"'

1. ChemInform Abstract: Enantioselective Allylic Amination of Morita-Baylis-Hillman Acetates Catalyzed by Chiral Thiourea-Phosphine

Author

Feng Sha, Xuan Zhao, Xin-Yan Wu, Tian-Chen Kang, and Jie Shen

Subjects
chemistry.chemical_compound, Allylic rearrangement, chemistry, Thiourea, Cyclohexane, Yield (chemistry), Enantioselective synthesis, General Medicine, Medicinal chemistry, Phosphine, Amination, Catalysis
Abstract

The enantioselective allylic amination of Morita-Baylis-Hillman acetates catalyzed by chiral cyclohexane-based thiourea-phosphine catalysts was investigated. In the presence of 20 mol% rosin-derived thiourea-phosphine 3j, the chiral amines were obtained in up to 88% yield and up to 85% ee.

Published
2016

2. ChemInform Abstract: Highly Enantioselective Direct Allylic Alkylation of Butenolides with Morita-Baylis-Hillman Carbonates Catalyzed by Chiral Squaramide-Phosphine

Author

Xin-Yan Wu, Xuan Zhao, Feng Sha, and Tian-Chen Kang

Subjects
Tsuji–Trost reaction, chemistry.chemical_compound, chemistry, Cyclohexane, Organocatalysis, Squaramide, Enantioselective synthesis, Organic chemistry, General Medicine, Optically active, Phosphine, Catalysis
Abstract

An efficient asymmetric vinylogous allylic alkylation of β,γ-butenolides with Morita–Baylis–Hillman carbonates has been developed. With a chiral cyclohexane-based squaramide-phosphine catalyst 5e, optically active γ,γ-disubstituted butenolides containing adjacent quaternary and tertiary chiral centers have been constructed in good-to-excellent yields (up to 98%) and excellent stereoselectivities (87 : 13–99 : 1 dr, 96–99% ee).

Published
2016

6. Combinatorial Study of the Optimization of Y2O3:Bi,Eu Red Phosphors

Author

Chen Gao, Ting-Shan Chan, Jun Bao, Xiao-Nan Liu, Chia-Chen Kang, Jianjun Ding, Lei Chen, and Ru-Shi Liu

Subjects
Photoluminescence, Energy transfer, Analytical chemistry, chemistry.chemical_element, Nanotechnology, Phosphor, Crystallography, X-Ray, medicine.disease_cause, Sensitivity and Specificity, Ion, Europium, medicine, Combinatorial Chemistry Techniques, Yttrium, Emission spectrum, Chemistry, General Chemistry, General Medicine, Excited state, Bismuth, Powder diffraction, Powder Diffraction, Synchrotrons, Ultraviolet, Excitation
Abstract

The present investigation aims at the synthesis of (Y2-xEuxBiy)O3 red phosphor materials using the combinatorial chemistry method. We developed square-type arrays consisting of 90 compositions to obtain the optimum composition of co-dopants in a Y2O3 host. The optimized composition was found to be (Y2-xEuxBiy)O3 (x = 0.16−0.18, y = 0.08−0.10). The screening of the compositions was investigated by analysis of the emission spectrum under 365 nm UV excitation arising from the energy transfer between Bi3+ and Eu3+ ions. The results of the photoluminescence excited by ultraviolet agree well with the conventional-scale synthesis results, indicating that the combinatorial screening method is fast, reliable, reproducible, and applicable to the study of powder materials with relatively quick calcinations at high synthesis temperatures.

Published
2007

21. ChemInform Abstract: Development of Modifiable Bidentate Amino Oxazoline Directing Group for Pd-Catalyzed Arylation of Secondary C-H Bonds.

Author

Chen, Kang, Li, Zhao‐Wei, Shen, Peng‐Xiang, Zhao, Hong‐Wei, and Shi, Zhang‐Jie

Subjects
*OXAZOLINE derivatives, *CARBON-carbon bonds, *ARYLATION
Abstract

The article presents chemical equations related to the article "Development of Modifiable Bidentate Amino Oxazoline Directing Group for Pd-Catalyzed Arylation of Secondary C-H Bonds" by K. Chen and others, published in the periodical "Chemistry- A European Journal" in 2015.

Published
2015
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23. ChemInform Abstract: Reductive Cleavage of the C(sp2)-C(sp3) Bond of Secondary Benzyl Alcohols: Rhodium Catalysis Directed by N-Containing Groups.

Author

Chen, Kang, Li, Hu, Lei, Zhi‐Quan, Li, Yang, Ye, Wen‐He, Zhang, Li‐Sheng, Sun, Jian, and Shi, Zhang‐Jie

Abstract

Optimized conditions including a Rh-catalyst and hydrogen as the reducing agent allow the reductive cleavage of bisaryl methanols bearing pyrazolyl or pyrimidyl directing groups. [ABSTRACT FROM AUTHOR]

Published
2013
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