Results 121 to 130 of about 140,419 (292)

Promotion mechanism of hydroxyl groups in catalyzing CO2 cycloaddition

Journal of CO2 Utilization
In this study, a series of hydroxy-functionalized quaternary ammonium salt catalysts, i.e., NEt3(HE)Br, NEt2(HE)2Br, NEt1(HE)3Br, and N(HE)4Br, were successfully prepared by quantitatively grafting hydrogen-bond donors (HBDs) as electrophilic sites on ...
Yiming Wang, Wensheng Wei, Yuxin Wang, Guangwen Xu, Jinggang Zhao, Lei Shi   +5 more
doaj  

Cage-confined photocatalysis for wide-scope unusually selective [2 + 2] cycloaddition through visible-light triplet sensitization

Nature Communications, 2020
Light-induced [2 + 2] cycloaddition is the most efficient way to generate cyclobutanes, while suffering from limitations of specific selectivity.
Jing-Si Wang, Kai Wu, Changzhen Yin, Kang Li, Yahao Huang, Jia Ruan, Ximin Feng, Peng Hu, Cheng-Yong Su   +8 more
doaj   +1 more source

Bioorthogonal Reaction of o‐Quinone with Furan‐2(3H)‐One for Site‐Selective Tyrosine Conjugation and Construction of Bispecific Antibody Complexes

Advanced Science, EarlyView.
A site‐selective, efficient, and mild tyrosine conjugation via tyrosinase oxidation and nucleophilic addition, allowing for site‐selective functionalization of peptides, recombinant proteins, and IgGs. Site‐selective mono‐functionalization of IgGs at Y296 enables the construction of immunoliposomes.
Hongfei Chen, Zhiyi Xu, Yishu Bao, Farshad Shiri, Dingdong Yuan, Yuke Hu, Biquan Li, Bin Zeng, Xiaojing Li, Hao Kong, Zikang Wang, Wilson Chun‐Yu Lau, Zhenyang Lin, Jiang Xia   +13 more
wiley   +1 more source

The Role of Cytochrome P450 AbyV in the Final Stages of Abyssomicin C Biosynthesis

Angewandte Chemie International Edition, Volume 62, Issue 3, January 16, 2023., 2023
The cytochrome P450 enzyme AbyV catalyses a key epoxidation in the final stages of the biosynthesis of the spirotetronate antibiotic abyssomicin C. Combining structural and computational data with a 13C labelling strategy was found to be a powerful approach to interrogate the biotransformation and determine the precise function of the enzyme.
Andrew J. Devine, Alice E. Parnell, Catherine R. Back, Nicholas R. Lees, Samuel T. Johns, Ainul Z. Zulkepli, Rob Barringer, Katja Zorn, James E. M. Stach, Matthew P. Crump, Martin A. Hayes, Marc W. van der Kamp, Paul R. Race, Christine L. Willis   +13 more
wiley   +1 more source

Stability of different phases of (C60)2 Structures [PDF]

arXiv, 2006
We investigate the possible binding configurations of pairs of C60 molecules when pushed against each other. Tersoff potential, which represents intramolecular interactions well, has been used to calculate potential energies. We begin relaxation of atomic coordinates at various distances of separation and for all possible mutual orientations of the two
arxiv  

Synthesis and antitumoral activity of novel biaryl hydroxy-triazole and fluorene-triazole hybrids [PDF]

Exploration of Drug Science
Aim: The development of selective and potent antitumor agents remains a significant challenge. This study aimed to synthesize and evaluate biaryl hydroxy-1,2,3-triazoles and 9H-fluorene-1,2,3-triazole hybrids, inspired by previously identified bioactive ...
David Chafi Zeitune, Marcelo Folhadella Martins Faria Azevedo, Mariane Senna Rangel, Robert de Sousa Bastos, José de Brito Vieira Neto, Claudia do Ó Pessoa, Camilla Djenne Buarque   +6 more
doaj   +1 more source

Catalyst‐Free Direct Hydrocarbonation of Terminal Alkynes Toward E‐Alkene Substituted Stabilized Sulfoxonium Ylides

Advanced Science, EarlyView.
The authors introduce a high‐throughput synthesis using amide‐sulfoxonium ylides as new nucleophilic reagents, enabling a catalyst‐ and base‐free hydrocarbonation of terminal alkynes under mild conditions, resulting in various E‐alkene substituted (hetero)amide‐sulfoxonium ylides with excellent regio‐ and stereoselectivity. The late‐stage modifications
Haiting Wu, Yougen Xu, An Lin, Jingyuan Liu, Huanjun Chen, Shimin Xie, Lebin Su   +6 more
wiley   +1 more source

Spectroscopic Manifestations and Implications for Catalysis of Quasi‐d10 Configurations in Formal Gold(III) Complexes

Angewandte Chemie International Edition, Volume 62, Issue 3, January 16, 2023., 2023
Through the interplay of X‐ray spectroscopy and computational analysis, we show that gold +I and +III complexes, despite their physically distinct electronic structures, tend to activate substrates to similar extents. We focus in particular on the role of electron‐sharing covalency of the metal‐ligand bonds and provide an explanation for the often ...
Evgeniya A. Trifonova, Isaac F. Leach, Winfried B. de Haas, Remco W. A. Havenith, Moniek Tromp, Johannes E. M. N. Klein   +5 more
wiley   +1 more source

Network-analysis-guided synthesis of weisaconitine D and liljestrandinine. [PDF]

, 2015
General strategies for the chemical synthesis of organic compounds, especially of architecturally complex natural products, are not easily identified. Here we present a method to establish a strategy for such syntheses, which uses network analysis.
Gallego, GM, Kou, KGM, Kulyk, S, Lebold, TP, Lee, JC, Lilien, R, Marth, CJ, Qin, J, Sarpong, R   +8 more
core   +2 more sources

1,3-Dipolar Cycloaddition Reaction of Thiophenecarbonitrile N-Oxides with Various Dipolarophiles [PDF]

, 1968
Yoshio Iwakura, Keikichi Uno, Shinsaku Shiraishi, Tatsuhiko Hongu   +3 more
openalex   +1 more source