scholarly journals Enantioselective aza-Friedel–Crafts reaction of furan with α-ketimino esters induced by a conjugated double hydrogen bond network of chiral bis(phosphoric acid) catalysts

2018 ◽  
Vol 9 (30) ◽  
pp. 6361-6367 ◽  
Author(s):  
Manabu Hatano ◽  
Haruka Okamoto ◽  
Taro Kawakami ◽  
Kohei Toh ◽  
Hidefumi Nakatsuji ◽  
...  
Keyword(s):  
Hydrogen Bond ◽  
Phosphoric Acid ◽  
Acid Catalysts ◽  
Hydrogen Bond Network ◽  
Bond Network ◽  
Double Hydrogen

Chiral C2- and C1-symmetric BINOL-derived bis(phosphoric acid) catalysts facilitated the enantioselective aza-Friedel–Crafts reaction of 2-methoxyfuran with α-ketimino esters.

Insights into the hydrogen bond network topology of phosphoric acid and water systems

2021 ◽  
Author(s):  
Austėja Mikalčiūtė ◽  
Linas Vilciauskas
Keyword(s):  
Hydrogen Bond ◽  
Phosphoric Acid ◽  
Proton Conductivity ◽  
Network Topology ◽  
Water Systems ◽  
Hydrogen Bond Network ◽  
Proton Conducting ◽  
Conducting Materials ◽  
Bond Network

Phosphoric acid and its mixtures with water are some of the best proton conducting materials known to science. Although, the proton conductivity in pure phosphoric acid decreases upon external doping...

Proton conduction mechanisms in the phosphoric acid–water system (H4P2O7–H3PO4·2H2O): a 1H, 31P and 17O PFG-NMR and conductivity study

2017 ◽  
Vol 19 (1) ◽  
pp. 587-600 ◽  
Author(s):  
Jan-Patrick Melchior ◽  
Klaus-Dieter Kreuer ◽  
Joachim Maier
Keyword(s):  
Hydrogen Bond ◽  
Ionic Conductivity ◽  
Phosphoric Acid ◽  
Water Content ◽  
Water System ◽  
Hydrogen Bond Network ◽  
Conduction Mechanisms ◽  
Bond Network ◽  
Pfg Nmr ◽  
Total Ionic Conductivity

The exceptionally high structural proton conductivity in neat phosphoric acid (H3PO4), which is closely related to the topology of its frustrated hydrogen bond network, is a singularity in that its contribution to the total ionic conductivity decreases with both increasing and decreasing water content.

Halides of Macrocyclic Silver(II) Complexes: Crystal Structures with Hydrogen Bond Network and Reaction Kinetics of the Decomposition

2021 ◽  
pp. 120431
Author(s):  
Akinori Honda ◽  
Shunta Kakihara ◽  
Shuhei Ichimura ◽  
Kazuaki Tomono ◽  
Mina Matsushita ◽  
...  
Keyword(s):  
Hydrogen Bond ◽  
Reaction Kinetics ◽  
Crystal Structures ◽  
Hydrogen Bond Network ◽  
Bond Network ◽  
Kinetics Of

scholarly journals Hydrogen‐Bond Network Determines the Early Photoisomerization of Cph1 and AnPixJ Phytochromes

2021 ◽  
Author(s):  
Xiang-Yang Liu ◽  
Teng-Shuo Zhang ◽  
Qiu Fang ◽  
Wei-Hai Fang ◽  
Leticia González ◽  
...  
Keyword(s):  
Hydrogen Bond ◽  
Hydrogen Bond Network ◽  
Bond Network

Supramolecular assembling using synthons with NH—CO(S)—CS—NH and NH—CO—CO—NH functionalities: crystal structures of (S,S)-N,N′-monothiooxalyldileucine methyl ester and its dithio analogue

2004 ◽  
Vol 60 (1) ◽  
pp. 90-96 ◽  
Author(s):  
Biserka Kojić-Prodić ◽  
Berislav Perić ◽  
Zoran Štefanić ◽  
Anton Meden ◽  
Janja Makarević ◽  
...  
Keyword(s):  
Hydrogen Bond ◽  
Hydrogen Bonding ◽  
Methyl Ester ◽  
Crystal Structures ◽  
Hydrogen Bond Network ◽  
Asymmetric Unit ◽  
Orthorhombic Space Group ◽  
Space Group ◽  
Bond Network ◽  
Bonding Systems

To compare the structural properties of oxalamide and thiooxalamide groups in the formation of hydrogen bonds suitable for supramolecular assemblies a series of retropeptides was studied. Some of them, having oxalamide bridges, are gelators of organic solvents and water. However, retropeptides with oxygen replaced by the sp 2 sulfur have not exhibited such properties. The crystal structures of the two title compounds are homostructural, i.e. they have similar packing arrangements. The monothio compound crystallizes in the orthorhombic space group P212121 with two molecules in the asymmetric unit arranged in a hydrogen-bond network with an approximate 41 axis along the crystallographic b axis. However, the dithio and dioxo analogues crystallize in the tetragonal space group P41 with similar packing patterns and hydrogen-bonding systems arranged in agreement with a crystallographic 41 axis. Thus, these two analogues are isostructural having closely related hydrogen-bonding patterns in spite of the different size and polarity of oxygen and sulfur which serve as the proton acceptors.

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