Search results for: Qi Lin

Items from 1 to 20 out of 737 results

article

Nickel‐Catalyzed Enantioselective α‐Allylation of Cyclic Ketones with Allylic Alcohols

Neng‐Quan Jiang, Ming‐Ming Li, Li‐Jun Xiao, Qi‐Lin Zhou

Advanced Synthesis & Catalysis > 366 > 18 > 3829 - 3832

Transition‐metal‐catalyzed asymmetric α‐allylation of ketones is a particularly useful tool for constructing stereocenters via C−C bond formation. However, this type of reaction often necessitated the use of activated ketones or pre‐prepared enol intermediates as substrates. In this study, we developed a nickel‐catalyzed α‐allylation of unactivated cycloketones with allylic alcohols to synthesize...

article

Design of a broadband high‐efficiency extended resistive continuous Class‐B/J power amplifier with novel drain voltage waveforms

Xin He, Jin Sheng Dong, Yong Mu Yang, Xin Xu, more

Microwave and Optical Technology Letters > 66 > 2 > n/a - n/a

This article presents an extended resistive continuous broadband Class‐B/J (ERCB/J) power amplifier (PA) that incorporates two newly designed parameters in the drain voltage waveform. The incorporation of these newly designed parameters enables the PA to achieve a lower degradation rate of efficiency and output power over a wide bandwidth. To validate the effectiveness of the proposed method, a PA...

article

A tightly‐coupled planar absorber with broadband and wide‐angle

Zhi Chen, Xian Qi Lin, Xinmi Yang, Yu Lu Fan, more

Microwave and Optical Technology Letters > 66 > 2 > n/a - n/a

Most planar absorbers are designed under normal incidence, leading to a sharp decline in absorber performance under oblique incidence, especially when the incidence angle exceeds 30°. Three‐dimensional structured absorbers ensure the performance of the absorber under oblique incidence, but they lack practicality due to their complex processing and assembly. In this letter, a tightly‐coupled planar...

article

Research on temperature and pressure interference in photoacoustic spectroscopy gas detection

Weilin Ye, Wenxuan Luo, Weihao Liu, Jingsong Xiao, more

Microwave and Optical Technology Letters > 66 > 1 > n/a - n/a

Photoacoustic spectroscopy (PAS) is a highly sensitive optical detection technique for trace gases. However, PAS is sensitive to environmental factors such as temperature and pressure during actual measurement. In this paper, we study the interference characteristics of temperature and pressure in PAS gas detection. The influence of pressure and temperature on PAS is theoretically analyzed based on...

article

Iron‐Catalyzed Alkenylzincation of Internal Alkynes^†

Wei‐Na Wang, Qiang Huang, Ye Jin, Qi‐Lin Zhou, more

Chinese Journal of Chemistry > 41 > 24 > 3547 - 3552

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,...

article

Effects of redox active agents on cyanocobalamin stability in heated milk

Yi Ding, Pei Jun Lim, Jayler Goh, Qi Lin, more

International Journal of Food Science & Technology > 58 > 12 > 6296 - 6305

Reducing agents and oxidizing agents have been identified as contributors to vitamin B12 losses associated with food processing and/or storage. We evaluated the effects of redox active agents on cyanocobalamin stability in heat‐treated non‐fat milk and neutral pH buffers. The largest average cyanocobalamin losses occurred in the presence of an added thiol (glutathione, cysteine, dithiothreitol and...

article

Design and Synthesis of Spirochroman‐2‐on‐4,1'‐indan‐7'‐ol and Its Application for Synthesizing Chiral Monophosphinite Ligands^†

Yang‐Ming Zhang, Shu‐Min Guo, Qing‐Xian Wang, Xiao‐Jie Zheng, more

Chinese Journal of Chemistry > 41 > 22 > 2988 - 2994

The design and synthesis of spirochroman‐2‐on‐4,1'‐indan‐7'‐ol (SCIOL) and its application for synthesizing chiral monophosphinite ligands are reported. The synthesis features a tandem double Friedel‐Crafts reaction/lactonization to construct the spiro framework and the desired racemic SCIOL was obtained via 6 steps with a total yield of 44.5%. Using an inclusion resolution with N‐benzylcinchonidinium...

article

Cyclic mechanical stretch pre‐stimulated bone marrow mesenchymal stem cells promote the healing of infected bone defect in a mouse model

Qi Lin, Xi Lin

Biotechnology Journal > 18 > 10 > n/a - n/a

Cyclic mechanical stretch (CMS) is an effective method to accelerate mesenchymal stem cells (MSCs) differentiation. Here, CMS pre‐stimulated bone marrow MSCs (CMS‐BMSCs) was investigated, characterized and evaluated the therapeutic potential of CMS‐BMSCs on the treatment of infected bone defect in mouse model. BMSCs were obtained from C57BL/6J mice and then subjected to CMS. The osteogenic differentiation...

article

A wideband low‐profile dual‐circularly polarized reflectarray with decoupled LHCP/RHCP beams

Yu Lu Fan, Xian Qi Lin, Xinmi Yang, Yu Xin Kang, more

Microwave and Optical Technology Letters > 65 > 12 > 3303 - 3311

This letter presents the design principle and experimental verification of a Ku‐band wideband low‐profile dual‐circularly polarized (dual‐CP) reflectarray (RA) with independent control of left‐/right‐handed circularly polarized (LHCP/RHCP) beams. Both the dynamic phase (DP) and Berry phase (BP) compensating methods are employed in the design of the unit cell, achieving independent LHCP/RHCP phase...

article

Enantioselective Synthesis of Chiral Amides by a Phosphoric Acid Catalyzed Asymmetric Wolff Rearrangement**

Jia‐Bin Pan, Zhi‐Chun Yang, Xuan‐Ge Zhang, Mao‐Lin Li, more

Angewandte Chemie > 135 > 39 > n/a - n/a

The enantioselective addition of potent nucleophiles to ketenes poses challenges due to competing background reactions and poor stereocontrol. Herein, we present a method for enantioselective phosphoric acid catalyzed amination of ketenes generated from α‐aryl‐α‐diazoketones. Upon exposure to visible light, the diazoketones undergo Wolff rearrangement to generate ketenes. The phosphoric acid not only...

article

Enantioselective Synthesis of Chiral Amides by a Phosphoric Acid Catalyzed Asymmetric Wolff Rearrangement**

Jia‐Bin Pan, Zhi‐Chun Yang, Xuan‐Ge Zhang, Mao‐Lin Li, more

Angewandte Chemie International Edition > 62 > 39 > n/a - n/a

article

Specnuezhenide ameliorates ultraviolet‐induced skin photoaging in mice by regulating the Sirtuin 3/8‐Oxoguanine DNA glycosylase signal

Nan Tang, Ying‐Yun Ren, Hao‐Tian Wu, Xi‐Ting Lv, more

Photodermatology, Photoimmunology & Photomedicine > 39 > 5 > 478 - 486

Purpose Ultraviolet‐induced skin photoaging was involved in DNA oxidative damage. Specnuezhenide, one of the secoiridoids extracted from Ligustri Lucidi Fructus, possesses antioxidant and anti‐inflammatory effects. Whether specnuezhenide ameliorates skin photoaging remains unclear. This study aimed to investigate the effect of specnuezhenide on skin photoaging induced by ultraviolet and explore the...

article

Cover Picture: Crystal Structure and NMR of an α,δ‐Peptide Foldamer Helix Shows Side‐Chains are Well Placed for Bifunctional Catalysis: Application as a Minimalist Aldolase Mimic (Angew. Chem. Int. Ed. 36/2023)

Qi Lin, Hao Lan, Chunmiao Ma, Ryan T. Stendall, more

Angewandte Chemie International Edition > 62 > 36 > n/a - n/a

A helical catalyst that is constructed from α‐ and δ‐amino acids: In their Research Article (e202305326), Alexander J. A. Cobb et al. present a foldamer helix whereby the catalytic functionalities are positioned in such a way that they can be exploited for bifunctional catalysis. The stability of the helix and the modularity of the system (represented by the jigsaw pieces) means that different α‐amino...

article

Crystal Structure and NMR of an α,δ‐Peptide Foldamer Helix Shows Side‐Chains are Well Placed for Bifunctional Catalysis: Application as a Minimalist Aldolase Mimic**

Qi Lin, Hao Lan, Chunmiao Ma, Ryan T. Stendall, more

Angewandte Chemie International Edition > 62 > 36 > n/a - n/a

We report the first NMR and X‐ray diffraction (XRD) structures of an unusual 13/11‐helix (alternating i, i+1 {NH−O=C} and i, i+3 {C=O−H−N} H‐bonds) formed by a heteromeric 1 : 1 sequence of α‐ and δ‐amino acids, and demonstrate the application of this framework towards catalysis. Whilst intramolecular hydrogen bonds (IMHBs) are the clear driver of helix formation in this system, we also observe an...

article

Titelbild: Crystal Structure and NMR of an α,δ‐Peptide Foldamer Helix Shows Side‐Chains are Well Placed for Bifunctional Catalysis: Application as a Minimalist Aldolase Mimic (Angew. Chem. 36/2023)

Qi Lin, Hao Lan, Chunmiao Ma, Ryan T. Stendall, more

Angewandte Chemie > 135 > 36 > n/a - n/a

article

Crystal Structure and NMR of an α,δ‐Peptide Foldamer Helix Shows Side‐Chains are Well Placed for Bifunctional Catalysis: Application as a Minimalist Aldolase Mimic**

Qi Lin, Hao Lan, Chunmiao Ma, Ryan T. Stendall, more

Angewandte Chemie > 135 > 36 > n/a - n/a

article

Ocular transcription factor E3‐associated perivascular epithelioid cell tumor in children: Case report and review of the literature

Jia‐Qi Lin, Xun Liu, Jin‐Zhi Zhao, Li‐Min Zhu, more

Pediatric Blood & Cancer > 70 > 10 > n/a - n/a

article

Platinum Metallacycle‐Based Molecular Recognition: Establishment and Application in Spontaneous Formation of a [2]Rotaxane with Light‐Harvesting Property

Bingbing Shi, Xupeng Li, Yongping Chai, Peng Qin, more

Angewandte Chemie > 135 > 31 > n/a - n/a

Macrocyclic molecule‐based host–guest systems, which provide contributions for the design and construction of functional supramolecular structures, have gained increasing attention in recent years. In particular, platinum(II) metallacycle‐based host–guest systems provide opportunities for chemical scientists to prepare novel materials with various functions and structures due to the well‐defined shapes...

article

Platinum Metallacycle‐Based Molecular Recognition: Establishment and Application in Spontaneous Formation of a [2]Rotaxane with Light‐Harvesting Property

Bingbing Shi, Xupeng Li, Yongping Chai, Peng Qin, more

Angewandte Chemie International Edition > 62 > 31 > n/a - n/a

article

Fecal microbiota transplantation and short‐chain fatty acids protected against cognitive dysfunction in a rat model of chronic cerebral hypoperfusion

Shao‐Hua Su, Ming Chen, Yi‐Fang Wu, Qi Lin, more

CNS Neuroscience & Therapeutics > 29 > S1 > 98 - 114

Aims Clear roles and mechanisms in explaining gut microbial dysbiosis and microbial metabolites short‐chain fatty acids (SCFAs) alterations in chronic cerebral ischemic pathogenesis have yet to be explored. In this study, we investigated chronic cerebral hypoperfusion (CCH)‐induced gut microbiota and metabolic profiles of SCFAs as well as the effects and mechanisms of fecal microbiota transplantation...

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INFONA - science communication portal

Search results for: Qi Lin

Nickel‐Catalyzed Enantioselective α‐Allylation of Cyclic Ketones with Allylic Alcohols

Design of a broadband high‐efficiency extended resistive continuous Class‐B/J power amplifier with novel drain voltage waveforms

A tightly‐coupled planar absorber with broadband and wide‐angle

Research on temperature and pressure interference in photoacoustic spectroscopy gas detection

Iron‐Catalyzed Alkenylzincation of Internal Alkynes^†

Effects of redox active agents on cyanocobalamin stability in heated milk

Design and Synthesis of Spirochroman‐2‐on‐4,1'‐indan‐7'‐ol and Its Application for Synthesizing Chiral Monophosphinite Ligands^†

Cyclic mechanical stretch pre‐stimulated bone marrow mesenchymal stem cells promote the healing of infected bone defect in a mouse model

A wideband low‐profile dual‐circularly polarized reflectarray with decoupled LHCP/RHCP beams

Enantioselective Synthesis of Chiral Amides by a Phosphoric Acid Catalyzed Asymmetric Wolff Rearrangement**

Enantioselective Synthesis of Chiral Amides by a Phosphoric Acid Catalyzed Asymmetric Wolff Rearrangement**

Specnuezhenide ameliorates ultraviolet‐induced skin photoaging in mice by regulating the Sirtuin 3/8‐Oxoguanine DNA glycosylase signal

Cover Picture: Crystal Structure and NMR of an α,δ‐Peptide Foldamer Helix Shows Side‐Chains are Well Placed for Bifunctional Catalysis: Application as a Minimalist Aldolase Mimic (Angew. Chem. Int. Ed. 36/2023)

Crystal Structure and NMR of an α,δ‐Peptide Foldamer Helix Shows Side‐Chains are Well Placed for Bifunctional Catalysis: Application as a Minimalist Aldolase Mimic**

Titelbild: Crystal Structure and NMR of an α,δ‐Peptide Foldamer Helix Shows Side‐Chains are Well Placed for Bifunctional Catalysis: Application as a Minimalist Aldolase Mimic (Angew. Chem. 36/2023)

Crystal Structure and NMR of an α,δ‐Peptide Foldamer Helix Shows Side‐Chains are Well Placed for Bifunctional Catalysis: Application as a Minimalist Aldolase Mimic**

Ocular transcription factor E3‐associated perivascular epithelioid cell tumor in children: Case report and review of the literature

Platinum Metallacycle‐Based Molecular Recognition: Establishment and Application in Spontaneous Formation of a [2]Rotaxane with Light‐Harvesting Property

Platinum Metallacycle‐Based Molecular Recognition: Establishment and Application in Spontaneous Formation of a [2]Rotaxane with Light‐Harvesting Property

Fecal microbiota transplantation and short‐chain fatty acids protected against cognitive dysfunction in a rat model of chronic cerebral hypoperfusion

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