Interaction of two functional groups through the benzene ring: Theory and experiment

2009 ◽  
Vol 30 (7) ◽  
pp. 1069-1074 ◽  
Author(s):  
Stanislav Böhm ◽  
Otto Exner
Keyword(s):  
Benzene Ring ◽  
Functional Groups ◽  
Ring Theory ◽  
Theory And Experiment

scholarly journals Rhodium-catalyzed C–H functionalization-based approach to eight-membered lactams

2015 ◽  
Vol 6 (4) ◽  
pp. 2275-2285 ◽  
Author(s):  
Shangze Wu ◽  
Rong Zeng ◽  
Chunling Fu ◽  
Yihua Yu ◽  
Xue Zhang ◽  
...  
Keyword(s):  
Benzene Ring ◽  
Functional Groups ◽  
Room Temperature ◽  
Ambient Air

Fused tricyclic skeleton in one shot: a RhIII catalyzed formal [4 + 2 + 2] cyclization of N-pivaloyloxybenzamides 1 with 1,6-allene-enes 2 adding two cycles to the benzene ring compatible with ambient air and moisture with a tolerance of many synthetic useful functional groups at room temperature have been developed.

Analyses on Hydrophily and Lipophilicity of Dust in Shanghai Different Traffic Concentration Areas

2011 ◽  
Vol 356-360 ◽  
pp. 990-993
Author(s):  
Jin Xia Yan ◽  
Hai Rong Wang ◽  
Dong Fang Li
Keyword(s):  
Infrared Spectroscopy ◽  
Benzene Ring ◽  
Functional Groups ◽  
Organic Pollutants ◽  
Motor Vehicle ◽  
Vehicle Exhaust ◽  
Spectroscopy Analysis ◽  
Main Component ◽  
Living Area ◽  
Lipophilic Substances

Based on process optimizing, in this article the dust was made a extraction analysis to investigate the ratio of lipophilic substances, which was collected in shanghai different traffic concentration areas. Also, the samples was made a infrared spectroscopy analysis to investigate the organic groups contained. It illustrates that the ratio of lipophilicity in traffic-intensive areas is higher up to 90.1 percent than in living area which is 33.5 percent, those of Shanghai suburb is the littlest, only 12.3 percent. the main functional groups of dust in Shanghai traffic-intensive areas are amino, associating hydroxyl, benzene ring, alkyl and-SH, which is similar to the main component of organic pollutants in motor vehicle exhaust.

Synthesis of 3,4-diaminobenzenethiol and its application in gold nanoparticle-based colorimetric determination of copper ions

RSC Advances ◽  
2016 ◽  
Vol 6 (107) ◽  
pp. 105119-105124 ◽  
Author(s):  
Chi Zhang ◽  
Li-Qiang Lu ◽  
Pan Deng ◽  
Xi-Ke Tian ◽  
Ming-Yang Liu ◽  
...  
Keyword(s):  
Gold Nanoparticle ◽  
Benzene Ring ◽  
Functional Groups ◽  
Copper Ions ◽  
Colorimetric Determination ◽  
Determination Of Copper

3,4-Diaminobenzenethiol can react with AuNPs via a strong covalent Au–S bond. The exposed amino functional groups on the benzene ring from neighboring AuNPs could bind to copper ions, resulting in AuNP aggregation.

FTIR Analysis of Extractable Fractions from FourIndonesian Natural Asphalts

2011 ◽  
Vol 236-238 ◽  
pp. 571-577 ◽  
Author(s):  
Ting Yao ◽  
Zhi Min Zong ◽  
Yu Gao Wang ◽  
Zhe Wen ◽  
Robert Mukasa ◽  
...  
Keyword(s):  
Fourier Transform ◽  
Benzene Ring ◽  
Functional Groups ◽  
Acid Ester ◽  
Structural Changes ◽  
Carboxyl Groups ◽  
Ftir Analysis ◽  
Ftir Spectrometry ◽  
More Care ◽  
Transmission And Reflection

Four natural asphalts (NAs) from Buton Rock, Indonesia, which were abbreviated as BRA-A, BRA-B, BRA-C and BAR-D, were continuously extracted by solvents, subdivided into four fractions and analyzed with Fourier transform infrared (FTIR) spectrometry. The transmission and reflection FTIR techniques were used to distinguish among different samples and fractions and to examine information concerning their structure, composition and structural changes upon fractional extract. Upon FTIR analysis, the methyl, methylene, oxhydryl and carboxyl groups are the major composition of these NAs. Some strong bonds at the zones of 2922-2856 cm-1, 1707-1606 cm-1 , 1453-1373 cm-1 , 1030 cm-1 and 872-748 cm-1 are assigned to >CH2 & -CH3 & –OH in carboxlic acid, ester & benzene ring, >C=O & -C-CH3, –CH2OH, -(CH2)n- & substituted benzene, etc. Much more care should be taken to investigate both N-containing functional groups and mineral multiphase compositions probably present in BRA-B, C and D.

scholarly journals N-Arylbenzo[b]phenothiazines as Reducing Photoredox Catalysts for Nucleophilic Additions of Alcohols to Styrenes: Shift towards Visible Light

Synlett ◽  
2020 ◽  
Author(s):  
Hans-Achim Wagenknecht ◽  
Fabienne Seyfert
Keyword(s):  
Visible Light ◽  
Benzene Ring ◽  
Functional Groups ◽  
Optoelectronic Properties ◽  
Nucleophilic Additions ◽  
Important Class ◽  
Photoredox Catalysis ◽  
Strong Reduction ◽  
Triple Bonds ◽  
Methyl Styrene

Abstract N-Phenylphenothiazines are an important class of photoredox catalysts because they are synthetically well accessible, they allow the tuning of the optoelectronic properties by different substituents, and they have strong reduction properties for activation of alkenes. One of the major disadvantages of N-phenylphenothiazines, however, is the excitation at 365 nm in the UV-A light range. We synthesized three differently dialkylamino-substituted N-phenylbenzo[b]phenothiazines as alternative photoredox catalysts and applied them for the nucleo­philic addition of alkohols to α-methyl styrene. The additional benzene ring shift the absorbance bathochromically and allows performing the photocatalyses by excitation at 385 nm and 405 nm. This type of photoredox catalysis tolerates other functional groups, as representatively shown for alcohols as substrates with C–C and C–N triple bonds.

Kekule's benzene ring theory: A subject for lighthearted banter

1965 ◽  
Vol 42 (5) ◽  
pp. 266 ◽  
Author(s):  
David H. Wilcox ◽  
Frederick R. Greenbaum
Keyword(s):  
Benzene Ring ◽  
Ring Theory

Learning from Molecules in Distress

2012 ◽  
Author(s):  
Roald Hoffmann ◽  
Henning Hopf
Keyword(s):  
Organic Chemistry ◽  
Water Molecule ◽  
Benzene Ring ◽  
Functional Groups ◽  
Optical Isomers ◽  
Chemical Structures ◽  
Comb Structure ◽  
The One ◽  
Average Position ◽  
As If

From the time we first got an inkling of the geometries and metrics of molecules, the literature of organic chemistry has contained characterizations of molecules as unstable, strained, distorted, sterically hindered, bent and battered. Such molecules are hardly seen as dull; on the contrary, they are perceived as worthwhile synthetic goals, and their synthesis, or evidence of their fleeting existence, acclaimed. What is going on here? Why this obsession with abnormal molecules? Is this molecular science sadistic at its core? Let’s approach these questions, first describing what is normal for molecules, so we can define the deviance chemists perceive. After a digression into the anthropomorphic language chemists generally use, and the psychology of creation in science, we will turn to the underlying, more serious concern: “What is the value of contemplating (or creating) deviance within science?” As many as 366,319 different eicosanes (C20H42) are conceivable, not counting optical isomers. And an enumeration of the components of a reasonably constrained universe of all compounds with up to 11 C, N, O, F atoms comes to >26 million compounds. An important feature of the chemical universe is that the tree of possible structures is denumerable. At the same time, the playground of chemical structures is subject to systematic elaboration, through the decoration of an underlying skeleton by functional groups of some stability. Very quickly a multitude turns into a universe. Of structure, and of function. Thinking of these molecules as fixed, rigid structures is natural—don’t they look like olive and toothpick assemblages, prettied up by computer rendering? And one can certainly get a long way in organic chemistry in the classical, mechanical mode. But the atoms in a molecule move continually, deviating, oscillating, as if held by springs, around an average position. The honey-comb structure of the benzene ring (a molecular tile, seemingly ever so flat and rigid as the one on your bathroom floor) has become an icon of chemistry just as the angled water molecule. Yet that tile is not rigid, it moves—and one can see the deformations/deviations by looking at its vibrational (what a telling name!) spectrum.

scholarly journals Microscopic Diffusion Characteristics of Linear Alkylbenzene Sulfonates on the Surface of Anthracite: The Influence of Different Attachment Sites of Benzene Ring in the Backbone

Minerals ◽  
2021 ◽  
Vol 11 (10) ◽  
pp. 1045
Author(s):  
Xuanlai Chen ◽  
Guochao Yan ◽  
Xianglin Yang ◽  
Guang Xu ◽  
Shuai Wei
Keyword(s):  
Benzene Ring ◽  
Functional Groups ◽  
Relative Concentration ◽  
Attachment Site ◽  
Simulation Method ◽  
Dynamics Simulation ◽  
Linear Alkylbenzene ◽  
Attachment Sites ◽  
Diffusion Characteristics ◽  
Linear Alkylbenzene Sulfonates

In order to explore the effect of the attachment site of the benzene ring in the backbone of the surfactant on its diffusion characteristics on the surface of anthracite, the molecular dynamics simulation method was used, and the four isomers (m-C16, m = 2,4,6,8; m represents the attachment site of the benzene ring in the backbone) of sodium hexadecyl benzene sulfonate (SHS) were selected. Binary models of surfactant/anthracite, surfactant/graphene modified by oxygen-containing functional groups, and a ternary model of water/surfactant/anthracite were constructed. By analyzing a series of properties such as interaction energy, contact surface area, relative concentration distribution, radial distribution function, hydrophobic tail chain order parameter, etc., it is concluded that the adsorption strength of 4-C16 on the surface of anthracite is the highest; the reason is that 4-C16 has the highest degree of aggregation near the oxygen-containing functional groups on the surface of anthracite. Further investigations find that 4-C16 can be densely covered on the ketone group, and the longer branch chain of 4-C16 has the highest degree of order in the Z-axis direction.

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