Results 31 to 40 of about 153,572 (317)

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   +1 more source

Synthesis of Bicyclic Isoxazoles and Isoxazolines via Intramolecular Nitrile Oxide Cycloaddition

Molecules, 2015
An efficient and straight forward procedure for the syntheses of bicyclic isoxazole/isoxazoline derivatives from the corresponding dimethyl-2-(2-nitro-1-aryl/alkyl)-2-(prop-2-yn-1yl)malonates or dimethyl 2-allyl-2-(2-nitro-1-aryl/alkyl ethyl)malonate is ...
Wen-Chang Chen, Veerababurao Kavala, Yu-Hsuan Shih, Yu-Hsuan Wang, Chun-Wei Kuo, Tang-Hao Yang, Chia-Yu Huang, Hao-Hsiang Chiu, Ching-Fa Yao   +8 more
doaj   +1 more source

Catalytic [4+2]- and [4+4]-cycloaddition using furan-fused cyclobutanone as a privileged C4 synthon

Nature Communications
Cycloaddition reactions play a pivotal role in synthetic chemistry for the direct assembly of cyclic architectures. However, hurdles remain for extending the C4 synthon to construct diverse heterocycles via programmable [4+n]-cycloaddition.
Kemiao Hong, Mengting Liu, Lixin Qian, Ming Bao, Gang Chen, Xinyu Jiang, Jingjing Huang, Xinfang Xu   +7 more
doaj   +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

Soft and Stiff 3D Microstructures by Step‐Growth Photopolymerization Using a Single Photoresin and Multi‐Photon Laser Printing

Advanced Functional Materials, EarlyView.
An additive and initiator‐free photoresin based on a prepolymer decorated with photoreactive step‐growth units as crosslinkers allows for the fabrication of 3D microstructures with strongly disparate mechanical properties ranging from stiff to soft. Abstract Manufacturing three‐dimensional (3D) microstructures with multi‐material properties via two ...
Tugce Nur Eren, Jiajie Liang, Jonathan Ludwig Günter Schneider, Martin Wegener, Jens Bauer, Katharina Ehrmann, Florian Feist, Christopher Barner‐Kowollik   +7 more
wiley   +1 more source

Diels−Alder Topochemistry via Charge-Transfer Crystals:  Novel (Thermal) Single-Crystal-to-Single-Crystal Transformations [PDF]

, 2001
The solid-state [4+2] cycloaddition of anthracene to bis(N-ethylimino)-1,4-dithiin occurs via a unique single-phase topochemical reaction in the intermolecular (1:1) charge-transfer crystal.
Hubig, S. M., Kim, J. H., Kochi, Jay K., Lindeman, Sergey V.   +3 more
core   +1 more source

Tunable Synthetic Hydrogel Modulates Hepatic Lineage Specification of Human Liver Organoid

Advanced Functional Materials, EarlyView.
In this study, a synthetic hydrogel is reported that supports the formation of hiPSC‐derived human liver organoids (HLOs). Hepatic lineage specification can be modulated via conjugation of RGD peptide to hydrogel: RGD‐conjugated hydrogels promote cholangiocyte differentiation, whereas RGD‐free hydrogels favor hepatocyte commitment of HLO cells.
Lei Wang, Lasse Riediger, Qi Rao, Xun Xu, Yan Nie, Yiduo Zhou, Junyao Zhang, Peng Tang, Weiwei Wang, Frank Tacke, Adrien Guillot, Ludovic Vallier, Irene Talon, Wenzhong Li, Yi‐An Yang, Rainer Haag, Nan Ma   +16 more
wiley   +1 more source

Crystal structure of trans-dichloridobis[N-(5,5-dimethyl-4,5-dihydro-3H-pyrrol-2-yl-κN)acetamide]palladium(II) dihydrate

Acta Crystallographica Section E: Crystallographic Communications, 2017
The title complex, [PdCl2(C8H14N2O)2]·2H2O, was obtained by N–O bond cleavage of the oxadiazoline rings of the trans-[dichlorido-bis(2,5,5-trimethyl-5,6,7,7a-tetrahydropyrrolo[1,2-b][1,2,4]oxadiazole-N1)]palladium(II) complex.
Jamal Lasri, Naser Eltaher Eltayeb, Matti Haukka, Bandar A. Babgi   +3 more
doaj   +1 more source

Recent Progress in Nitro-Promoted Direct Functionalization of Pyridones and Quinolones

Molecules, 2020
Nitro group is one of the most important functional groups in organic syntheses because its strongly electron-withdrawing ability activates the scaffold, facilitating the reaction with nucleophilic reagents or the Diels−Alder reaction.
Feiyue Hao, Nagatoshi Nishiwaki
doaj   +1 more source

Azomethine Ylides—Versatile Synthons for Pyrrolidinyl-Heterocyclic Compounds

Molecules, 2023
Azomethine ylides are nitrogen-based three-atom components commonly used in [3+2]-cycloaddition reactions with various unsaturated 2π-electron components.
Siva S. Panda, Marian N. Aziz, Jacek Stawinski, Adel S. Girgis   +3 more
doaj   +1 more source