An Fe(OTf)3-catalyzed intramolecular hydroarylation of arene-alkynes with high functional group tolerance has been reported, affording a series of phenanthrene derivatives efficiently. A low catalytic amount of Fe(OTf)3 is applied in this reaction. This transformation provides a convenient and practical method for the preparation of phenanthrenes.

Phenanthrenes

Functional group

10.1016/j.jscs.2019.05.004

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Citations (2)

Cu(II)-Catalyzed 6π-Photocyclization of Dienynes

The Journal of Organic Chemistry (2016)

Ruiwen Jin Jinjin Chen Yiyong Chen Wangsheng Liu Dawen Xu

The first 6π-photocyclization of dienynes was developed, which provides a new and effective protocol for the synthesis of the phenyl ring in excellent yields with nice functional group tolerance. In this transformation, the Cu(OTf)2 catalyst plays a key role in the conversion of alkyne moiety into an alkene-type moiety, which means that the dienyne reactant is converted into a triene-type substrate. Thus, this reaction proceeds via a Cu(II)-catalyzed 6π-photocyclization of triene-type derivatives.

Moiety

Alkyne

Alkene

Functional group

10.1021/acs.joc.6b02537

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Citations (22)

A reaction mode of carbene-catalysed aryl aldehyde activation and induced phenol OH functionalization

Nature Communications (2017)

Xingkuan Chen Hongling Wang Kazuki Doitomi Chong Yih Ooi Pengcheng Zheng

Abstract The research in the field of asymmetric carbene organic catalysis has primarily focused on the activation of carbon atoms in non-aromatic scaffolds. Here we report a reaction mode of carbene catalysis that allows for aromatic aldehyde activation and remote oxygen atom functionalization. The addition of a carbene catalyst to the aldehyde moiety of 2-hydroxyl aryl aldehyde eventually enables dearomatization and remote OH activation. The catalytic process generates a type of carbene-derived intermediate with an oxygen atom as the reactive centre. Inexpensive achiral urea co-catalyst works cooperatively with the carbene catalyst, leading to consistent enhancement of the reaction enantioselectivity. Given the wide presence of aromatic moieties and heteroatoms in natural products and synthetic functional molecules, we expect our reaction mode to significantly expand the power of carbene catalysis in asymmetric chemical synthesis.

Surface Modification

10.1038/ncomms15598

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Citations (63)

Optimal design of stochastic complex systems with applications to deep excavations

Wangsheng Liu

I am also grateful to other

10.32657/10220/48126

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ジエニン類の銅(II)触媒による6π‐光環化反応

The Journal of Organic Chemistry (2016)

Ruiwen Jin Jinjin Chen Chen Yiyong Wangsheng Liu XU Dawen

Source

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Research on the Reform of the Course Logistics System Planning and Design

Logistics Sci-tech (2009)

Wangsheng Liu

From the point of optimizing the overall curriculum design, this article takes the teaching reform of the course 《Logistics System Planning and Design》 as the research object, integrates and optimizes the knowledge system and teaching content against the existing problems of the course, so as to improve the teaching quality of this course and stimulate students' interest in learning. Combined with the characteristics of this course and the present learning situation of students, this paper probes the reformation of teaching methods and assessment methods for the improvememt of students' learning efficiency and the best learning effect.

Course (navigation)

Source

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Citations (1)

CCDC 2285490: Experimental Crystal Structure Determination

The Cambridge Structural Database (2024)

Hai Hao Shaoheng Qin Yanzhi Zhang Wangsheng Liu Feng Jin

An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.

10.5517/ccdc.csd.cc2gq7hy

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Improvement of Transmitting Laser Beam Quality by Using Two Deformable Mirrors

Symposium on Photonics and Optoelectronics (2009)

Xuhua Zhai Hongtao Zhang Haifeng Xu Wangsheng Liu

The use of two deformable mirrors (DM) with finite conjugate ranges is studied for compensating amplitude and phase distortions due to laser propagation through turbulence atmosphere. The Strehl ratio versus the log-amplitude variance (also known as the Rytov parameter) and the conjugate range of the second deformable mirror are plotted. The conclusion is drawn that an adaptive optics transmitting system with two DMs can clearly improve theoretical performance (compared to a system with one DM) in delivering energy on target through atmospheric turbulence. The second DM placed at a finite conjugate range can minimize lost energy outside the radius of the first deformable mirror and thus maximize the Strehl ratio.

Strehl ratio

Deformable Mirror

Conjugate

10.1109/sopo.2009.5230195

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CCDC 1980938: Experimental Crystal Structure Determination

The Cambridge Structural Database (2020)

Xue-Wen Yi Siyu Lei Wangsheng Liu Fengrui Che Chunzheng Yu

10.5517/ccdc.csd.cc24hb77

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