Substituted ethylene dications. Structures of phenylmethyl cations substituted with an electron-withdrawing group on the cation center

1989 ◽  
Vol 111 (1) ◽  
pp. 34-40 ◽  
Author(s):  
Tomohiko Ohwada ◽  
Koichi Shudo
Keyword(s):  
Electron Withdrawing Group ◽  
Cation Center

scholarly journals Novel Acetohydrazide Pyrazole Derivatives: Design, Synthesis, Characterization and Antimicrobial Activity

2019 ◽  
Vol 31 (12) ◽  
pp. 2740-2744
Author(s):  
Anil Verma ◽  
Vinod Kumar ◽  
Ramesh Kataria ◽  
Joginder Singh
Keyword(s):  
Mass Spectrometry ◽  
Antimicrobial Activity ◽  
Antimicrobial Agents ◽  
Antimicrobial Activities ◽  
Pyrazole Derivatives ◽  
Reaction Conditions ◽  
Design Synthesis ◽  
Structure Activity ◽  
Electron Withdrawing Group ◽  
Sar Study

Eleven acetohydrazide linked pyrazole derivatives were designed and synthesized via condensation of acetohyadrazide with different substituted formyl pyrazole derivatives under mild reaction conditions. Synthesized compounds were characterized on the basis of IR, NMR (1H & 13C) and mass spectrometry. The antimicrobial activities of all the compounds were screened against four bacterial and two fungal strains. Among the synthesized compounds, three compounds viz. 6b, 6c and 6d were found as efficient antimicrobial agents in reference to the standard drugs viz. ciprofloxacin and amphotericin-B. Further, structure-activity relationship (SAR) study revealed that electron-withdrawing group enhances the antimicrobial potential of synthesized derivatives as compared to other groups present in the ring. Hence, among compounds 6b-c, compound 6d could be explored further against other microbes to prove its vitality.

High-Performance Ambipolar Polymers Based on Electron-Withdrawing Group Substituted Bay-Annulated Indigo

2019 ◽  
Vol 29 (7) ◽  
pp. 1804839 ◽  
Author(s):  
Jie Yang ◽  
Yaqian Jiang ◽  
Zeyi Tu ◽  
Zhiyuan Zhao ◽  
Jinyang Chen ◽  
...  
Keyword(s):  
High Performance ◽  
Electron Withdrawing Group

Asymmetric 1,3-Dipolar Cycloaddition of Nitrones with an Electron-Withdrawing Group to Allylic Alcohols Utilizing Diisopropyl Tartrate as a Chiral Auxiliary.

ChemInform ◽  
2006 ◽  
Vol 37 (46) ◽  
Author(s):  
Xia Ding ◽  
Katsumi Taniguchi ◽  
Yoshihara Hamamoto ◽  
Kazunori Sada ◽  
Shuhei Fujinami ◽  
...  
Keyword(s):  
Chiral Auxiliary ◽  
Dipolar Cycloaddition ◽  
Allylic Alcohols ◽  
Electron Withdrawing Group

scholarly journals Electronically Excited States of Potential Interstellar, Anionic Building Blocks for Astrobiological Nucleic Acids

2021 ◽  
Vol 8 ◽  
Author(s):  
Taylor J. Santaloci ◽  
Marie E. Strauss ◽  
Ryan C. Fortenberry
Keyword(s):  
Nucleic Acids ◽  
Excited States ◽  
Lone Pair ◽  
Building Blocks ◽  
Hydroxyl Group ◽  
Quantum Chemical Analysis ◽  
Electronically Excited States ◽  
Neutral Radical ◽  
Electronically Excited ◽  
Electron Withdrawing Group

Functionalizing deprotonated polycyclic aromatic hydrocarbon (PAH) anion derivatives gives rise to electronically excited states in the resulting anions. While functionalization with −OH and −C2H, done presently, does not result in the richness of electronically excited states as it does with −CN done previously, the presence of dipole-bound excited states and even some valence excited states are predicted in this quantum chemical analysis. Most notably, the more electron withdrawing −C2H group leads to valence excited states once the number of rings in the molecule reaches three. Dipole-bound excited states arise when the dipole moment of the corresponding neutral radical is large enough (likely around 2.0 D), and this is most pronounced when the hydrogen atom is removed from the functional group itself regardless of whether functionalized by a hydroxyl or enthynyl group. Deprotonatation of the hydroxyl group in the PAH creates a ketone with a delocalized highest occupied molecular orbital (HOMO) unlike deprotonation of a hydrogen on the ring where a localized lone pair on one of the carbon atoms serves as the HOMO. As a result, hydroxyl functionlization and subsequent deprotonation of PAHs creates molecules that begin to exhibit structures akin to nucleic acids. However, the electron withdrawing −C2H has more excited states than the electron donating −OH functionalized PAH. This implies that the −C2H electron withdrawing group can absorb a larger energy range of photons, which signifies an increasing likelihood of being stabilized in the harsh conditions of the interstellar medium.

Syntheses of PCDTBT containing tetrafluorobenzene as electron-withdrawing group with deep HOMO energy level and applications for photovoltaics

Polymer ◽  
2016 ◽  
Vol 102 ◽  
pp. 84-91 ◽  
Author(s):  
Juae Kim ◽  
Nam Hee Kim ◽  
Seyeong Song ◽  
Song Yi Park ◽  
Sangmin Chae ◽  
...  
Keyword(s):  
Energy Level ◽  
Homo Energy ◽  
Electron Withdrawing Group ◽  
Homo Energy Level
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