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Jin C.,New United Group Company Ltd | Gu L.,Key Laboratory of Chemistry in Ethnic Medicinal Resources | Gu L.,Yunnan University | Yuan M.,Yunnan University
Catalysis Science and Technology | Year: 2015

The transformation of aromatic aldehydes into aryl ketones by nickel-catalyzed cross-coupling has been developed. This transformation represents an efficient and attractive synthetic utilization of organozinc reagents. The reaction provides a mild, practical method toward the synthesis of aryl ketones which are versatile intermediates and building blocks in organic synthesis. © The Royal Society of Chemistry 2015. Source


Gao X.-M.,Key Laboratory of Chemistry in Ethnic Medicinal Resources | Gao X.-M.,Yunnan University | Ji B.-K.,Key Laboratory of Chemistry in Ethnic Medicinal Resources | Ji B.-K.,Yunnan University | And 10 more authors.
Journal of the Brazilian Chemical Society | Year: 2016

Three new biphenyls were isolated from Garcinia multiflora. The structures of these biphenyls were elucidated by spectroscopic methods, and their rotavirus activity was evaluated. © 2016 Sociedade Brasileira de Química. Source


Zhou X.,Key Laboratory of Chemistry in Ethnic Medicinal Resources | Zhou X.,Yunnan Nationalities University | Chen M.,Key Laboratory of Chemistry in Ethnic Medicinal Resources | Chen M.,Yunnan Nationalities University | And 6 more authors.
Ceramics International | Year: 2013

Spinel LiMn2O4 cathode material was rapidly synthesized in 1 h by solid-state combustion synthesis using metal carbonates as metal ion sources and glucose as a fuel. The effect of different amounts of glucose on the structure and electrochemical performance of as-prepared LiMn2O4 was investigated by X-ray diffraction (XRD), scanning electron micrographs (SEM), galvanostatic charge-discharge test, cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS). LiMn 2O4 spinel was identified as the main crystalline phase with the presence of minor Mn3O4. The amount of glucose greatly affected the formation of Mn3O4. The optimal content of glucose was found to be 10 wt%. Under this condition, the Mn 3O4 peaks almost disappeared, and high-purity spinel LiMn2O4 was obtained. Its initial discharge specific capacity of was 125.9 mAh/g, and discharge specific capacity retained at 105.2 mAh/g after 40 cycles. The detail influence of glucose on the electrochemical activity, reversibility and cycling performance of LiMn2O4 was discussed. © 2012 Elsevier Ltd and Techna Group S.r.l. Source


Zhou X.,Key Laboratory of Chemistry in Ethnic Medicinal Resources | Zhou X.,Yunnan Nationalities University | Chen M.,Key Laboratory of Chemistry in Ethnic Medicinal Resources | Chen M.,Yunnan Nationalities University | And 8 more authors.
Vacuum | Year: 2014

Spinel LiMn2O4 cathode material was rapidly prepared by solid-state combustion synthesis based on a two-stage calcination progress which used lithium carbonate and manganese carbonate as raw materials and citric acid as a fuel. The structure and physicochemical properties of the obtained LiMn2O4 powders were investigated by thermogravimetric analysis (TG) and differential thermal analysis (DSC), X-ray diffraction (XRD), scanning electron microscopy (SEM), galvanostatic charge-discharge test, cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS). The results show that the successful formation of single-phase LiMn2O4 product is highly dependent on its second-stage calcination temperature. Compared with other conditions, the as-prepared LiMn2O4 powders which experienced the second-stage, and calcined at 700 C is the most uniform, and the charge transfer resistance (Rct) is the lowest, accompanying the best electrochemical activity and highest discharge capacity. Its initial discharge specific capacity is 119.1 mA h/g. © 2013 Elsevier Ltd. All rights reserved. Source

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