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317 results on '"Wang, Wei‐Na"'

13. Iron‐Catalyzed Alkenylzincation of Internal Alkynes†.

Author

Wang, Wei‐Na, Huang, Qiang, Jin, Ye, Zhou, Qi‐Lin, and Zhu, Shou‐Fei

Abstract

Comprehensive Summary: The alkenylzincation of internal alkynes is an effective method for the synthesis of multi‐substituted conjugated dienes; however, the current catalytic systems for this reaction are limited in terms of substrate scope and selectivity control, which restricts its practical applications. Herein, we report the first iron‐catalyzed alkenylzincation of internal alkynes, which features mild conditions, simple operation, broad substrate scope (including aryl/alkyl, diaryl, and dialkyl acetylenes), excellent functional group tolerance (tolerating highly active functional groups such as ester, methylthio, amide, sulfonyl, cyano, etc.), and high activity (with a turnover number of up to 11500, the highest record for carbometallation reactions). Notably, the catalytic system described in this article also realized the highly selective vinylzincation of unfunctionalized internal alkynes as well as the alkenylzincation of unsymmetrical diarylacetylenes and dialkyl acetylenes, which have not been achieved with other catalytic systems reported in the literatures. The current study provides a highly selective access to synthetically important multi‐substituted conjugated dienes. [ABSTRACT FROM AUTHOR]

Published
2023
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14. Iron‐Catalyzed Alkenylzincation of Internal Alkynes†.

Author

Wang, Wei‐Na, Huang, Qiang, Jin, Ye, Zhou, Qi‐Lin, and Zhu, Shou‐Fei

Abstract

Comprehensive Summary: The alkenylzincation of internal alkynes is an effective method for the synthesis of multi‐substituted conjugated dienes; however, the current catalytic systems for this reaction are limited in terms of substrate scope and selectivity control, which restricts its practical applications. Herein, we report the first iron‐catalyzed alkenylzincation of internal alkynes, which features mild conditions, simple operation, broad substrate scope (including aryl/alkyl, diaryl, and dialkyl acetylenes), excellent functional group tolerance (tolerating highly active functional groups such as ester, methylthio, amide, sulfonyl, cyano, etc.), and high activity (with a turnover number of up to 11500, the highest record for carbometallation reactions). Notably, the catalytic system described in this article also realized the highly selective vinylzincation of unfunctionalized internal alkynes as well as the alkenylzincation of unsymmetrical diarylacetylenes and dialkyl acetylenes, which have not been achieved with other catalytic systems reported in the literatures. The current study provides a highly selective access to synthetically important multi‐substituted conjugated dienes. [ABSTRACT FROM AUTHOR]

Published
2023
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16. A Novel Pattern Rejection Criterion Based on Multiple Classifiers

Author

Wang, Wei-Na, Zhang, Xu-Yao, Suen, Ching Y., Hutchison, David, editor, Kanade, Takeo, editor, Kittler, Josef, editor, Kleinberg, Jon M., editor, Mattern, Friedemann, editor, Mitchell, John C., editor, Naor, Moni, editor, Nierstrasz, Oscar, editor, Pandu Rangan, C., editor, Steffen, Bernhard, editor, Sudan, Madhu, editor, Terzopoulos, Demetri, editor, Tygar, Doug, editor, Vardi, Moshe Y., editor, Weikum, Gerhard, editor, Zhou, Zhi-Hua, editor, and Roli, Fabio, editor

Published
2013
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48. Synthesis and Spectral Properties of a Novel Fluorescent Probe for Zn2+ Based on a Benzoxazole Fluorophore

Author

Wang Wei-Na, Chen Xue-Mei, Tao Hao-Ran, and Pi Hui-Min

Subjects
Fluorophore, 010405 organic chemistry, Metal ions in aqueous solution, Spectral properties, General Chemistry, Benzoxazole, 010402 general chemistry, Mass spectrometry, Photochemistry, 01 natural sciences, Fluorescence, 0104 chemical sciences, chemistry.chemical_compound, chemistry
Abstract

A novel turn-on fluorescent probe containing a benzoxazole fluorophore has been synthesised and its response to different metal ions has been investigated by spectrometry. The probe was highly selective and sensitive to Zn2+ and showed a complexation ratio towards Zn2+ of 1:1. It also exhibited a linear response range for Zn2+ from 0.3 to 4.8 μmol L−1 with a detection limit of 0.36 μmol L−1.

Published
2018

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