scholarly journals Organocatalytic asymmetric Henry reaction of 1H-pyrrole-2,3-diones with bifunctional amine-thiourea catalysts bearing multiple hydrogen-bond donors

2016 ◽  
Vol 12 ◽  
pp. 295-300 ◽  
Author(s):  
Ming-Liang Zhang ◽  
Deng-Feng Yue ◽  
Zhen-Hua Wang ◽  
Yuan Luo ◽  
Xiao-Ying Xu ◽  
...  
Keyword(s):  
Hydrogen Bond ◽  
Henry Reaction ◽  
Multiple Hydrogen Bond ◽  
Catalytic Asymmetric ◽  
Quaternary Stereocenters ◽  
First Time ◽  
Hydrogen Bond Donors

For the first time, a catalytic asymmetric Henry reaction of 1H-pyrrole-2,3-diones was achieved with a chiral bifunctional amine-thiourea as a catalyst possessing multiple hydrogen-bond donors. With this developed method, a range of 3-hydroxy-3-nitromethyl-1H-pyrrol-2(3H)-ones bearing quaternary stereocenters were obtained in acceptable yield (up to 75%) and enantioselectivity (up to 73% ee).

Conductive zigzag Pd(iii)–Br chain complex realized by a multiple-hydrogen-bond approach

CrystEngComm ◽  
2020 ◽  
Vol 22 (23) ◽  
pp. 3999-4004 ◽  
Author(s):  
Mohammad Rasel Mian ◽  
Unjila Afrin ◽  
Hiroaki Iguchi ◽  
Shinya Takaishi ◽  
Takefumi Yoshida ◽  
...  
Keyword(s):  
Hydrogen Bond ◽  
Metal Complexes ◽  
Oxidation State ◽  
Chain Complex ◽  
Multiple Hydrogen Bond ◽  
First Time ◽  
Zigzag Structure

Coexistence of zigzag structure and the uncommon Pd(iii) oxidation state in quasi-1D halogen-bridged metal complexes was realized in a conductive Br-bridged Pd chain complex, [Pd(dabdOH)2Br]SO4·3H2O (2), for the first time.

Interaction of Gold Atom with Clusters of Water: Few Computational Mise-En-Scènes with Hydrogen Bonding Motif

2008 ◽  
Vol 73 (11) ◽  
pp. 1457-1474 ◽  
Author(s):  
Eugene S. Kryachko
Keyword(s):  
Hydrogen Bond ◽  
Hydrogen Bonding ◽  
Computational Model ◽  
Photoelectron Spectroscopy ◽  
Water Clusters ◽  
Gold Atom ◽  
Proton Acceptor ◽  
Anion Photoelectron Spectroscopy ◽  
Relationship Of ◽  
First Time

The present work outlines the fair relationship of the computational model with the experiments on anion photoelectron spectroscopy for the gold-water complexes [Au(H2O)1≤n≤2]- that is established between the auride anion Au- and water monomer and dimer thanks to the nonconventional hydrogen bond where Au- casts as the nonconventional proton acceptor. This work also extends the computational model to the larger complexes [Au(H2O)3≤n≤5]- where gold considerably thwarts the shape of water clusters and even particularly breaks their conventional hydrogen bonding patterns. The fascinating phenomenon of the lavish proton acceptor character of Au- to form at least six hydrogen bonds with molecules of water is computationally unveiled in the present work for the first time.

Multiple Hydrogen-Bond Array Reinforced Cellular Polymer Films from Colloidal Crystalline Assemblies of Soft Latex Particles

2012 ◽  
Vol 1 (5) ◽  
pp. 603-608 ◽  
Author(s):  
Yunhua Chen ◽  
Samuel T. Jones ◽  
Ian Hancox ◽  
Richard Beanland ◽  
Edward J. Tunnah ◽  
...  
Keyword(s):  
Hydrogen Bond ◽  
Polymer Films ◽  
Latex Particles ◽  
Multiple Hydrogen Bond ◽  
Cellular Polymer
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