排序方式: 共有121条查询结果,搜索用时 93 毫秒
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Kun‐Quan Chen Zhong‐Hua Gao Song Ye 《Angewandte Chemie (Weinheim an der Bergstrasse, Germany)》2019,131(4):1195-1199
The enantioselective N‐heterocyclic carbene catalyzed [3+3] annulation of α‐bromoenals by dynamic kinetic resolution (DKR) of enamines and normal resolution of α,α‐disubstituted imines were developed. The corresponding substituted dihydropyridones were isolated in good yields with excellent diastereo‐ and enantioselectivities, and a high selective factor (up to 83) was realized for the resolution of α,α‐disubstituted imines. 相似文献
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Zhao Zhang Xiaopeng Li Prof. Cheng Zhong Prof. Naiqin Zhao Prof. Yida Deng Prof. Xiaopeng Han Prof. Wenbin Hu 《Angewandte Chemie (Weinheim an der Bergstrasse, Germany)》2020,132(18):7312-7317
The fabrication of metal-supported hybrid structures with enhanced properties typically requires external energy input, such as pyrolysis, photolysis, and electrodeposition. In this study, silver-nanoparticle-decorated transition-metal hydroxide (TMH) composites were synthesized by an approach based on a spontaneous redox reaction (SRR) at room temperature. The SRR between silver ions and TMH provides a simple and facile route to establish effective and stable heterostructures that can enhance the oxygen evolution reaction (OER) activity. Ag@Co(OH)x grown on carbon cloth exhibits outstanding OER activity and durability, even superior to IrO2 and many previously reported OER electrocatalysts. Experimental and theoretical analysis demonstrates that the strong electronic interaction between Ag and Co(OH)2 activates the silver clusters as catalytically OER active sites, effectively optimizing the binding energies with reacted intermediates and facilitating the OER kinetics. 相似文献
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Dr. Minami Odagi Kota Furukori Kan Takayama Prof. Dr. Keiichi Noguchi Prof. Dr. Kazuo Nagasawa 《Angewandte Chemie (Weinheim an der Bergstrasse, Germany)》2017,129(23):6709-6712
Described herein is the enantioselective syntheses of (+)- and (−)-rishirilide B from the corresponding optically active β-substituted tetralones, which were obtained by oxidative kinetic resolution based on α-hydroxylation in the presence of a chiral guanidine-bisurea bifunctional organocatalyst. Benzylic oxidation of the tetralones at C1 followed by regioselective isomerization of the oxabenzonorbornadiene structure led to rishirilide B. Our findings lead to the revision of the previously proposed (2R,3R,4R) absolute configuration of (+)-rishirilide B to (2S,3S,4S). 相似文献
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