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18 results on '"Liu, Yonghong"'

3. TiO2-Modified Montmorillonite-Supported Porous Carbon-Immobilized Pd Species Nanocomposite as an Efficient Catalyst for Sonogashira Reactions

Author

Chen, Yuli, primary, Sun, Kailang, additional, Zhang, Taojun, additional, Zhou, Jie, additional, Liu, Yonghong, additional, Zeng, Minfeng, additional, Ren, Xiaorong, additional, Feng, Ruokun, additional, Yang, Zhen, additional, Zhang, Peng, additional, Wang, Baoyi, additional, and Cao, Xingzhong, additional

Published
2023
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5. Physicochemical Properties and Anticoagulant Activity of Purified Heteropolysaccharides from Laminaria japonica

Author

Li, Tingting, primary, Ma, Haiqiong, additional, Li, Hong, additional, Tang, Hao, additional, Huang, Jinwen, additional, Wei, Shiying, additional, Yuan, Qingxia, additional, Shi, Xiaohuo, additional, Gao, Chenghai, additional, Mi, Shunli, additional, Zhao, Longyan, additional, Zhong, Shengping, additional, and Liu, Yonghong, additional

Published
2022
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6. TiO 2 -Modified Montmorillonite-Supported Porous Carbon-Immobilized Pd Species Nanocomposite as an Efficient Catalyst for Sonogashira Reactions.

Author

Chen, Yuli, Sun, Kailang, Zhang, Taojun, Zhou, Jie, Liu, Yonghong, Zeng, Minfeng, Ren, Xiaorong, Feng, Ruokun, Yang, Zhen, Zhang, Peng, Wang, Baoyi, and Cao, Xingzhong

Subjects
SONOGASHIRA reaction, TITANIUM dioxide, FOURIER transform infrared spectroscopy, POSITRON annihilation, MONTMORILLONITE, X-ray photoelectron spectroscopy, METAL catalysts
Abstract

In this study, a combination of the porous carbon (PCN), montmorillonite (MMT), and TiO2 was synthesized into a composite immobilized Pd metal catalyst (TiO2-MMT/PCN@Pd) with effective synergism improvements in catalytic performance. The successful TiO2-pillaring modification for MMT, derivation of carbon from the biopolymer of chitosan, and immobilization of Pd species for the prepared TiO2-MMT/PCN@Pd0 nanocomposites were confirmed using a combined characterization with X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), N2 adsorption–desorption isotherms, high-resolution transition electron microscopy (HRTEM), X-ray photoelectron spectroscopy (XPS), and Raman spectroscopy. It was shown that the combination of PCN, MMT, and TiO2 as a composite support for the stabilization of the Pd catalysts could synergistically improve the adsorption and catalytic properties. The resultant TiO2-MMT80/PCN20@Pd0 showed a high surface area of 108.9 m2/g. Furthermore, it exhibited moderate to excellent activity (59–99% yield) and high stability (recyclable 19 times) in the liquid–solid catalytic reactions, such as the Sonogashira reactions of aryl halides (I, Br) with terminal alkynes in organic solutions. The positron annihilation lifetime spectroscopy (PALS) characterization sensitively detected the development of sub-nanoscale microdefects in the catalyst after long-term recycling service. This study provided direct evidence for the formation of some larger-sized microdefects during sequential recycling, which would act as leaching channels for loaded molecules, including active Pd species. [ABSTRACT FROM AUTHOR]

Published
2023
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14. A New Triterpenoid Saponin from Pulsatilla cernua

Author

Xu, Yajuan, primary, Bai, Lu, additional, Liu, Yonghong, additional, Liu, Yue, additional, Xu, Tunhai, additional, Xie, Shengxu, additional, Si, Yunshan, additional, Zhou, Haiou, additional, Liu, Tonghua, additional, and Xu, Dongming, additional

Published
2010
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18. Cytotoxic Polyketides from the Marine Sponge-Derived Fungus Pestalotiopsis heterocornis XWS03F09.

Author

Lei, Hui, Lei, Jing, Zhou, Xuefeng, Hu, Mei, Niu, Hong, Song, Can, Chen, Siwei, Liu, Yonghong, and Zhang, Dan

Subjects
POLYKETIDES, MARINE fungi, CHEMICAL structure, CIRCULAR dichroism, OPTICAL rotation, CELL lines, CANCER cells, PESTALOTIOPSIS
Abstract

Four new compounds, including two new polyketides, heterocornols M and N (1, 2), and a pair of epimers, heterocornols O and P (3, 4), were isolated from the fermentation broth of the marine sponge-derived fungus Pestalotiopsis heterocornis XWS03F09, together with three known compounds (5–7). The new chemical structures were established on the basis of a spectroscopic analysis, optical rotation, experimental and calculated electronic circular dichroism (ECD). All of the compounds (1–7) were evaluated for their cytotoxic activities, and heterocornols M-P (1–4) exhibited cytotoxicities against four human cancer cell lines with IC50 values of 20.4–94.2 μM. [ABSTRACT FROM AUTHOR]

Published
2019
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