Results 51 to 60 of about 104,064 (339)

Polyoxometalate (POM)-layered double hydroxides (LDH) composite materials: design and catalytic applications [PDF]

, 2017
Layered double hydroxides (LDHs) are an important large class of two-dimensional (2D) anionic lamellar materials that possess flexible modular structure, facile exchangeability of inter-lamellar guest anions and uniform distribution of metal cations in ...
Li, Tengfei, MIras, Haralampos N., Song, Yu-Fei   +2 more
core   +1 more source

Synthesis of Chitosan-La₂O₃ Nanocomposite and Its Utility as a Powerful Catalyst in the Synthesis of Pyridines and Pyrazoles

Molecules, 2021
Recently, the development of nanocatalysts based on naturally occurring polysaccharides has received a lot of attention. Chitosan (CS), as a biodegradable and biocompatible polysaccharide, is considered to be an excellent template for the design of a ...
Khaled D. Khalil, Sayed M. Riyadh, Mariusz Jaremko, Thoraya A. Farghaly, Mohamed Hagar   +4 more
doaj   +1 more source

Development of highly selective ligands for separations of actinides from lanthanides in the nuclear fuel cycle [PDF]

, 2011
This account summarizes recent work by us and others on the development of ligands for the separation of actinides from lanthanides contained in nuclear waste streams in the context of a future European strategy for nuclear waste management. The current
Harwood, Laurence, Hudson, Michael J., Lewis, Frank   +2 more
core   +1 more source

Iron-Catalyzed Sulfonylmethylation of Imidazo[1,2-α]pyridines with N,N-Dimethylacetamide and Sodium Sulfinates

Molecules
Functionalized imidazo[1,2-α]pyridines are important scaffolds in pharmaceuticals. Herein, we present an efficient 3-sulfonylmethylation protocol for imidazo[1,2-α]pyridines by sodium sulfinates in DMA and H2O (2:1) via an FeCl3-catalyzed three-component
Shengnan Sun, Hexia Ye, Haibo Liu, Junchen Li, Xiaojing Bi   +4 more
doaj   +1 more source

Intramolecular carbolithiation of N-allyl-ynamides: an efficient entry to 1,4-dihydropyridines and pyridines – application to a formal synthesis of sarizotan

Beilstein Journal of Organic Chemistry, 2012
We have developed a general synthesis of polysubstituted 1,4-dihydropyridines and pyridines based on a highly regioselective lithiation/6-endo-dig intramolecular carbolithiation from readily available N-allyl-ynamides.
Wafa Gati, Mohamed M. Rammah, Mohamed B. Rammah, Gwilherm Evano   +3 more
doaj   +1 more source

Über 1-Aza-bicyclo-heptane

CHIMIA, 1976
A simple way to synthesize 7-phenyl-1-aza-bicyclo[2,2,1]heptanes out of 4-benzoyl-pyridines is described. The corresponding 3- benzoyl-pyridines did not yield the expected 7-phenyl-1-azabicyclo [3,1,1] heptanes.
A. Marxer
doaj   +1 more source

Electron-Deficient Acetylenes as Three-Modal Adjuvants in S_N^H Reaction of Pyridinoids with Phosphorus Nucleophiles

Molecules, 2021
Publications covering a new easy metal-free functionalization of pyridinoids (pyridines, quinolines, isoquinolines, acridine) under the action of the system of electron-deficient acetylenes (acetylenecarboxylic acid esters, acylacetylenes)/P-nucleophiles
Boris A. Trofimov, Pavel A. Volkov, Anton A. Telezhkin   +2 more
doaj   +1 more source

New Pyridine Derivatives from Essential Oils

CHIMIA, 1992
Four new pyridines 1–4 have been isolated from jonquil absolute and their structures confirmed by synthesis. These pyridines also occur in other essential oils.
Bruno Maurer, Arnold Hauser
doaj   +2 more sources

Introduction of the difluoromethyl group at the meta- or para-position of pyridines through regioselectivity switch

Nature Communications
Difluoromethyl pyridines have gained significant attention in medicinal and agricultural chemistry. The direct C−H-difluoromethylation of pyridines represents a highly efficient economic way to access these azines.
Pengwei Xu, Zhe Wang, Shu-Min Guo, Armido Studer   +3 more
doaj   +1 more source

Regioselective reactions of 3,4-pyridynes enabled by the aryne distortion model. [PDF]

, 2013
The pyridine heterocycle continues to play a vital role in the development of human medicines. More than 100 currently marketed drugs contain this privileged unit, which remains highly sought after synthetically. We report an efficient means to access di-
Garg, Neil K, Goetz, Adam E
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