Results 21 to 30 of about 5,865 (290)

(Thio)urea-mediated synthesis of functionalized six-membered rings with multiple chiral centers

Beilstein Journal of Organic Chemistry, 2016
Organocatalysis, now running its second decade of life, is being considered one of the main tools a synthetic chemist has to perform asymmetric catalysis. In this review the synthesis of six-membered rings, that contain multiple chiral centers, either by
Giorgos Koutoulogenis, Nikolaos Kaplaneris, Christoforos G. Kokotos   +2 more
doaj   +1 more source

Scalable Synthesis of 1,3,4,5-Tetraaryl Imidazolium Salts as Precursors of Sterically Demanding N-Heterocyclic Carbenes

SynOpen, 2020
A convenient, large-scale, and cost-efficient synthesis of 4,5-diarylsubstituted N,N-diarylimidazolium salts is described. A variety of 1,3,4,5-tetraaryl imidazolium salts with increasing electron donation and steric bulk of the N-aryl groups was ...
Cengiz Azap, Anna Christoffers, Renat Kadyrov   +2 more
doaj   +1 more source

Synthesis and Applications of Carbohydrate-Based Organocatalysts

Molecules, 2021
Organocatalysis is a very useful tool for the asymmetric synthesis of biologically or pharmacologically active compounds because it avoids the use of noxious metals, which are difficult to eliminate from the target products.
Elżbieta Wojaczyńska, Franz Steppeler, Dominika Iwan, Marie-Christine Scherrmann, Alberto Marra   +4 more
doaj   +1 more source

Thiazol-4-one derivatives from the reaction of monosubstituted thioureas with maleimides: structures and factors determining the selectivity and tautomeric equilibrium in solution

Beilstein Journal of Organic Chemistry, 2016
2-(Alkyl(aryl)amino)thiazol-4(5H)-ones can regioselectively be prepared from monoalkyl(aryl)thioureas and maleimides. In solution, the former heterocycles exist in a tautomeric equilibrium with 2-(alkyl(aryl)imino)thiazolidin-4-ones and the substituent ...
Alena S. Pankova, Pavel R. Golubev, Alexander F. Khlebnikov, Alexander Yu. Ivanov, Mikhail A. Kuznetsov   +4 more
doaj   +1 more source

A Reagent-Controlled Phospha-Michael Addition Reaction of Nitroalkenes with Bifunctional N‑Heterocyclic Phosphine (NHP)-Thioureas

, 2016
Bifunctional N-heterocyclic phosphine (NHP)-thioureas have been successfully applied for phospha-Michael addition reaction of nitroalkenes to afford diversely substituted β-nitrodiazaphosphonates. This transformation takes place at room temperature under
Hai Huang (140371), Jun Yong Kang (1447048), Jake Palmas (3348008)   +2 more
core   +1 more source

Synthesis of chiral sulfoximine-based thioureas and their application in asymmetric organocatalysis

Beilstein Journal of Organic Chemistry, 2012
For the first time, chiral sulfoximine derivatives have been applied as asymmetric organocatalysts. In combination with a thiourea-type backbone the sulfonimidoyl moiety leads to organocatalysts showing good reactivity in the catalytic desymmetrization ...
Marcus Frings, Isabelle Thomé, Carsten Bolm   +2 more
doaj   +1 more source

Thioureas as Ligands in Organometallic Reactions

, 2014
Thioureas are air and moisture stable, and they can coordinate to various metal centers, making their derivatives versatile ligands for transition-metal-catalyzed reactions. This account provides an overview of recent developments in the use of thioureas
Yang, Zhen, Shi, Li-Li, Gong, Jianxian, Li, Jingjie, Chen, Jiahua   +4 more
core   +1 more source

Charge‐Polarized Ni─S4 Single‐Atom Sites Drive Selective Photoreforming of Poly(lactic acid) to Lactate and Hydrogen

Advanced Functional Materials, EarlyView.
Atomically dispersed Ni–S4 sites on CdS nanorods induce interfacial charge polarization, directing photogenerated electrons to H2 evolution and holes to selective ester‐bond cleavage of poly(lactic acid). Without sacrificial reagents, this charge‐coupled system produces lactate while suppressing overoxidation, achieving an H2 evolution rate of 41.74 ...
Yu Yao, Panpan Zhang, Jinqiang Zhang, Xi‐lin Wu, Tara Pukala, Yifei Wang, Bernt Johannessen, Shaobin Wang, Xiaoguang Duan   +8 more
wiley   +1 more source

Interfacial Failure and Self‐Healing in Solid‐State Batteries

Advanced Materials, EarlyView.
Dynamic interfacial self‐healing offers an adaptive route to mitigate coupled mechanical, chemical, and electrochemical degradation in solid‐state batteries. This review connects evolving interfacial failure mechanisms with physical‐flow, chemical‐restoration, stimuli‐responsive, and electric‐field‐assisted repair strategies, highlighting targeted self‐
Xinxin Zhu, Tengfei Dai, Wendi Dou, Zhiheng Li, Kaihua Wen, Yanqun Lv, Ming Zhao, Jun Lu, Zaiping Guo   +8 more
wiley   +1 more source

Synthesis and applications of Palladium complexes Part I. The synthesis, single crystal structures and liquid crystalline phase behavior of Alkoxy substituted Tolans. Part II. Palladium-Complexes of Thioureas and phosphine sulfides [PDF]

, 2008
Three series of alkoxy substituted tolans p-X-C(_6)H(_4)-C≡C-C(_6)H(_4)-p-OC(_n)H(_2n+1) [X = H (series 1), CH(_3) (series 2), OCH(_3) (series 3)] with varying chain length were synthesized by Pd/Cu-catalysed Sonogashira cross-coupling reactions of ...
Wongkhan, Kittiya
core