Electron attachment to microhydrated 4-nitro- and 4-bromo-thiophenol

2021 ◽  
Author(s):  
Leo Sala ◽  
Barbora Sedmidubská ◽  
Ivo Stanislav Vinklárek ◽  
Michal Farnik ◽  
Robin Schürmann ◽  
...  
Keyword(s):  
Functional Groups ◽  
Electron Attachment ◽  
Para Position

We investigate the effect of microhydration on electron attachment to thiophenols with halogen (Br) and nitro (NO2) functional groups in the para position. We focus on the formation of anions...

Reaching the south: metal-catalyzed transformation of the aromatic para-position

2016 ◽  
Vol 52 (84) ◽  
pp. 12398-12414 ◽  
Author(s):  
Aniruddha Dey ◽  
Soham Maity ◽  
Debabrata Maiti
Keyword(s):  
Functional Groups ◽  
Para Position ◽  
The South ◽  
Metal Catalyzed

This article highlights the various protocols developed till date for selective installation of suitable functional groups at the para-position of arenes.

Steric-Hindrance Triggered Remote Lithiations of Bulky Silyl-Substituted­ Arenes

Synthesis ◽  
2019 ◽  
Vol 51 (18) ◽  
pp. 3536-3544 ◽  
Author(s):  
Andreas B. Bellan ◽  
Paul Knochel
Keyword(s):  
Functional Groups ◽  
Steric Hindrance ◽  
Para Position ◽  
Silyl Group ◽  
The One

Functionalized arenes bearing two bulky triethylsilyl substituents were regioselectively lithiated at the 4-position (para position) by using a mixture of nBuLi and PMDTA (N,N,N′,N′′,N′′-pentamethyldiethylenetriamine). The resulting aryllithium species, bearing sensitive functional groups such as amides or carbamates, reacted with a range of electrophiles leading to tri- and tetrasubstituted remote-functionalized products. This lithiation could be extended to 2,2′-bis(triethylsilyl)biphenyl, for which the favored metalation site was the one where steric interference of the silyl group could be avoided.

Influence of Functional Groups on the Site-Selective Dissociation of Adenine upon Low-Energy Electron Attachment

2007 ◽  
Vol 46 (27) ◽  
pp. 5238-5241 ◽  
Author(s):  
Stephan Denifl ◽  
Philipp Sulzer ◽  
Dieter Huber ◽  
Fabio Zappa ◽  
Michael Probst ◽  
...  
Keyword(s):  
Functional Groups ◽  
Electron Attachment ◽  
Low Energy ◽  
Energy Electron ◽  
Selective Dissociation ◽  
Low Energy Electron ◽  
Site Selective

Improving integration between functional groups: A case in organization change and implications for theory and practice

1971 ◽  
Author(s):  
Warren G. Bennis ◽  
Michael Beer ◽  
Gerald R. Pieters ◽  
Alan T. Hundert ◽  
Samuel H. Marcus ◽  
...  
Keyword(s):  
Functional Groups ◽  
Organization Change ◽  
Theory And Practice

ON THE THREE-BODY ELECTRON ATTACHMENT TO OXYGEN IN THE PLASMA OF A NON-SELF-MAINTAINED DISCHARGE

1979 ◽  
Vol 40 (C7) ◽  
pp. C7-103-C7-104
Author(s):  
A. N. Vasilieva ◽  
I. A. Grishina ◽  
V. I. Ktitorov ◽  
A. S. Kovalev ◽  
A. T. Rakhimov
Keyword(s):  
Electron Attachment ◽  
Maintained Discharge ◽  
Three Body

The Anticoagulant Activity of 3.3’-(p-Alkylthio-Benzylidene)-Bis-4-Hydroxycoumarins and Their Oxidation Products

1967 ◽  
Vol 17 (01/02) ◽  
pp. 277-286 ◽  
Author(s):  
Maria Gumińska ◽  
M Eckstein ◽  
Barbara Stachurska ◽  
J Sulko
Keyword(s):  
Biological Activity ◽  
Anticoagulant Activity ◽  
Oxidation Products ◽  
Para Position ◽  
Sulphur Atom ◽  
Group I ◽  
One Step

SummaryThe anticoagulant activity of 3.3’-(benzylidene)-bis-4-hydroxycoumarin derivatives has been estimated by one step Quick’s method. The derivatives contained the following groups in the para position of benzylidene residue: NCS- (I), CH3-S- (II), CH3-SO-(III), CH3-S02- (IV), C2H5-S- (V), C2H5-SO- (VI), C2H5-S02- (VII). All these compounds were much more active than 3.3’-(benzylidene)-bis-4-hydroxycoumarin itself.Compounds possessing the ethyl chain at the sulphur atom (V, VI, VII) were more active than methyl homologues (II, III, IV). Comparison of the activity of the series of thio-, sulphoxy-, and sulphonyl-derivatives showed that among methyl- and ethyl-derivatives those with the sulphoxy grouping (III, VI) displayed the greatest anticoagulant activity. The action of sulphonyl (IV, VII) and thio-derivatives (II, V) was weaker and shortest. The derivative with the NCS-group (I) possessed a relatively the lowest activity among the investigated compounds. 3.3’-(p-Ethylsulphoxybenzyl-idene)-bis-4-hydroxycoumarin (VI), with distinct biological activity reached about ½ of dicoumarol activity.

HYDROXYAPATITE, ALGINATE, AND CHITOSAN FOR BONE SCAFFOLDS: SPECTROSCOPY STUDY

2016 ◽  
Vol 19 (2) ◽  
pp. 93-100
Author(s):  
Lalita El Milla
Keyword(s):  
Tissue Engineering ◽  
Bone Tissue Engineering ◽  
Bone Tissue ◽  
Functional Groups ◽  
Bone Growth ◽  
Three Dimensional ◽  
Dimensional Structure ◽  
Tissue Engineering Scaffolds ◽  
Hydroxyapatite Powder ◽  
Materials Used

Scaffolds is three dimensional structure that serves as a framework for bone growth. Natural materials are often used in synthesis of bone tissue engineering scaffolds with respect to compliance with the content of the human body. Among the materials used to make scafffold was hydroxyapatite, alginate and chitosan. Hydroxyapatite powder obtained by mixing phosphoric acid and calcium hydroxide, alginate powders extracted from brown algae and chitosan powder acetylated from crab. The purpose of this study was to examine the functional groups of hydroxyapatite, alginate and chitosan. The method used in this study was laboratory experimental using Fourier Transform Infrared (FTIR) spectroscopy for hydroxyapatite, alginate and chitosan powders. The results indicated the presence of functional groups PO43-, O-H and CO32- in hydroxyapatite. In alginate there were O-H, C=O, COOH and C-O-C functional groups, whereas in chitosan there were O-H, N-H, C=O, C-N, and C-O-C. It was concluded that the third material containing functional groups as found in humans that correspond to the scaffolds material in bone tissue engineering.

High Resolution Displacement of Functional Groups onto Fluorocarbon Resin Surface by Using ArF Excimer Laser

1996 ◽  
Vol 451 ◽  
Author(s):  
T. Shimizu ◽  
M. Murahara
Keyword(s):  
Contact Angle ◽  
High Resolution ◽  
Laser Beam ◽  
Thin Layer ◽  
Functional Groups ◽  
Excimer Laser ◽  
Laser Fluence ◽  
Large Area ◽  
Three Solutions ◽  
Arf Excimer Laser

ABSTRACTA Fluorocarbon resin surface was selectively modified by irradiation with a ArF laser beam through a thin layer of NaAlO2, B(OH)3, or H2O solution to give a hydrophilic property. As a result, with low fluence, the surface was most effectively modified with the NaAlO2 solution among the three solutions. However, the contact angle in this case changed by 10 degrees as the fluence changed only 1mJ/cm2. When modifying a large area of the surface, high resolution displacement could not be achieved because the laser beam was not uniform in displacing functional groups. Thus, the laser fluence was successfully made uniform by homogenizing the laser beam; the functional groups were replaced on the fluorocarbon resin surface with high resolution, which was successfully modified to be hydrophilic by distributing the laser fluence uniformly.

A Multi-Layer Approach to the Equation of Motion Coupled-Cluster Method for the Electron Affinity

2020 ◽  
Author(s):  
Soumi Haldar ◽  
Achintya Kumar Dutta
Keyword(s):  
Electron Affinity ◽  
Electron Attachment ◽  
Equation Of Motion ◽  
Cluster Method ◽  
Coupled Cluster ◽  
Coupled Cluster Method ◽  
Large Molecules ◽  
Layer Method ◽  
Speed Up ◽  
Attachment Process

We have presented a multi-layer implementation of the equation of motion coupled-cluster method for the electron affinity, based on local and pair natural orbitals. The method gives consistent accuracy for both localized and delocalized anionic states. It results in many fold speedup in computational timing as compared to the canonical and DLPNO based implementation of the EA-EOM-CCSD method. We have also developed an explicit fragment-based approach which can lead to even higher speed-up with little loss in accuracy. The multi-layer method can be used to treat the environmental effect of both bonded and non-bonded nature on the electron attachment process in large molecules.<br>

Sign in / Sign up

Export Citation Format

Share Document