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1,274 results on '"Zhang, Xiuhua"'

158. Accessing indole–isoindole derivatives via palladium-catalyzed [3+2] cyclization of isocyanides with alkynyl imines.

Author

Chen, Dianpeng, Li, Jianming, Liu, Gongle, Zhang, Xiuhua, Wang, Xin, Liu, Yongwei, Liu, Xuan, Liu, Xinghai, Li, Yongqin, and Shan, Yingying

Subjects
ISOCYANIDES, PALLADIUM catalysts, RING formation (Chemistry), HYDRIDES
Abstract

A facile protocol for the preparation of indole–isoindole derivatives was developed and proceeds via a palladium-catalyzed [3+2] cyclization of isocyanides with alkynyl imines. In this transformation, the palladium catalyst has a triple role, serving simultaneously as a π acid, a transition-metal catalyst and a hydride ion donor, thus enabling the dual function of isocyanide both as a C1 synthon for cyanation and a C1N1 synthon for imidoylation. Significantly, the reaction is the sole successful example for accessing indole–isoindole derivatives, and will open up new avenues to assemble unique N-heterocycle frameworks. Furthermore, the synthetic value of this protocol is demonstrated in the late-stage modification of physiologically active molecules and in the construction of aggregation-induced emission compounds. [ABSTRACT FROM AUTHOR]

Published
2023
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164. Design of fault isolation device of distribution networ

Author

JING Dong, ZHANG Xiuhua, and SUN Hongliang

Subjects
distribution network, single-phase ground fault, isolation device, impeder, Mining engineering. Metallurgy, TN1-997
Abstract

In view of shortages of refuse action or delay of traditional leakage protection device under fault of power distribution network, a fault isolation device of distribution network was designed. Inductance and adjustable capacitor in parallel are used to design impeder of the device, and coupling voltage generated by additional winding of the impeder to drive control system to switch adjustable capacitance rapidly, so as to realize on-line adjustment of isolation parameters accurately in fault condition. The simulation and experimental results show that the isolation device can offer high impedance, isolate fault point effectively, and guarantee safe and reliable operation of the distribution network when the power distribution network occur single-phase fault.

Published
2016
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186. Water‐Stable CsPbBr3/Reduced Graphene Oxide Nanoscrolls for High‐Performance Photoelectrochemical Sensing.

Author

Mao, Lebao, Xiao, Yao, Liu, Hao, Zhang, Xiuhua, Wang, Shengfu, Huang, Wei‐Hua, and Chen, Miao‐Miao

Subjects
GRAPHENE oxide, QUANTUM dots, OPTICAL properties, AFLATOXINS, MYCOTOXINS
Abstract

Perovskite quantum dots (PQDs) have attracted much attention in the field of photoelectrochemical (PEC) sensors owing to their superb optical properties and efficient charge transport, but the inherent poor stability severely hinders their PEC applications. Herein, hydrolysis‐resistant CsPbBr3/reduced graphene oxide nanoscrolls (CsPbBr3/rGO NSs) are obtained by solvent‐assisted self‐rolling process toward water‐stable PEC sensors. CsPbBr3 QDs embedded in rGO nanosheets can be prevented from water since the multilayer rGO shell layers, which maintains excellent optical properties. On account of strong interfacial interactions, rGO nanosheets are crimped spontaneously with CsPbBr3 QDs, which offer access to superb structural and long‐term storage stability. Moreover, appropriate band alignment and ultrafast interfacial carrier transfer enable CsPbBr3/rGO NSs to exhibit greatly enhanced anode photocurrent response for subsequent PEC sensing. As a demonstration, the molecular imprinted PEC sensors for two kinds of mycotoxins (aflatoxin B1 or ochratoxin A) presents an ultra‐high sensitivity and good anti‐interference ability. Significantly, this work provides an inspirable and convenient route for hydrolysis‐resistant PQDs‐based optoelectronic and photoelectrocatalytic applications in aqueous ambience. [ABSTRACT FROM AUTHOR]

Published
2023
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193. Catalytic promiscuity of O-methyltransferases from Corydalis yanhusuo leading to the structural diversity of benzylisoquinoline alkaloids

Author

Bu, Junling, primary, Zhang, Xiuhua, additional, Li, Qishuang, additional, Ma, Ying, additional, Hu, Zhimin, additional, Yang, Jian, additional, Liu, Xiuyu, additional, Wang, Ruishan, additional, Jiao, Xiang, additional, Chen, Tong, additional, Lai, Changjiangsheng, additional, Cui, Guanghong, additional, Tang, Jinfu, additional, Kong, Yu, additional, Yang, Lei, additional, Lin, Sheng, additional, Chen, Yun, additional, Guo, Juan, additional, and Huang, Luqi, additional

Published
2022
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