Assessment of the Performance of the Bond Resonance Energy, Circuit Resonance Energy, Magnetic Resonance Energy, Ring Currents, and Aromaticity of Anthracene, Biphenylene, Phenalenyl, and p-Terphenyl

2021 ◽  
Author(s):  
Jerry Ray Dias
Keyword(s):  
Magnetic Resonance ◽  
Resonance Energy ◽  
Ring Currents

A study of the aromaticity and ring currents of azulene and azaazulenes

RSC Advances ◽  
2016 ◽  
Vol 6 (110) ◽  
pp. 108538-108544 ◽  
Author(s):  
Rahila Mattohti ◽  
Ablikim Kerim
Keyword(s):  
Magnetic Resonance ◽  
Resonance Energy ◽  
Ring Currents ◽  
Topological Resonance Energy

The global aromaticity of azaazulenes has been investigated using topological resonance energy (TRE), percentage topological resonance energy (% TRE), and magnetic resonance energy (MRE) methods.

Reaction of chloral with naphthalene, and the synthesis of α-methoxynaphthylacetic acids from naphthyl(trichloromethyl)carbinols

1968 ◽  
Vol 46 (13) ◽  
pp. 2233-2238 ◽  
Author(s):  
Wilkins Reeve ◽  
John C. Hoffsommer ◽  
Patrick F. Aluotto
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Side Chain ◽  
Naphthalene Ring ◽  
Ring Currents ◽  
Nuclear Magnetic

From the Friedel–Crafts reaction of chloral and naphthalene, others have reported the isolation of only 2-naphthyl(trichloromethyl)carbinol. Our reexamination of this reaction has shown that a mixture of 1- and 2-naphthyl(trichloromethyl)carbinols is obtained and that 80 to 90% of the product consists of the 1-naphthyl(trichloromethyl)carbinol. The 1- and 2-naphthyl(trichloromethyl)carbinols, their acetates, and their methyl ethers differ in their nuclear magnetic resonance (n.m.r.) spectra in that the signal of the α-hydrogen of the side chain of the 1-naphthyl isomer always occurs 0.8 p.p.m. downfield compared to the signal of the α-hydrogen of the corresponding 2-naphthyl isomer. This is because the α-hydrogens in the 1-naphthyl series of these compounds are in the region between the 1- and 8-positions of the naphthalene ring and subject to the ring currents of both benzenoid rings.The mixture of crude naphthyl(trichloromethyl)carbinols was converted to the mixture of α-methoxynaphthylacetic acids, and these were separated. A small amount of α,α′-dimethoxy-1,5-naphthalenediacetic acid was also obtained, demonstrating that a certain amount of 1,5-substitution occurred in the Friedel–Crafts reaction of naphthalene and chloral.

scholarly journals A study on the aromatic conjugation pathways and the ring currents of bridged [18]annulenes

RSC Advances ◽  
2019 ◽  
Vol 9 (44) ◽  
pp. 25351-25357
Author(s):  
Qimanguli Tuoheti ◽  
Ablikim Kerim
Keyword(s):  
Energy Method ◽  
Resonance Energy ◽  
Hydrogen Atoms ◽  
Ring Currents ◽  
Topological Resonance Energy

The topological resonance energy method was used to investigate the global aromaticity of a set of [18]annulene-derived compounds obtained by replacing two, four, or all six of the inner hydrogen atoms with bridges (oxygen, imino-, sulfur, or combinations of the three).

SPIN DYNAMICS IN BILAYER CUPRATE SUPERCONDUCTORS

2012 ◽  
Vol 26 (20) ◽  
pp. 1250129
Author(s):  
YU LAN ◽  
JIHONG QIN
Keyword(s):  
Magnetic Resonance ◽  
Kinetic Energy ◽  
Cuprate Superconductors ◽  
Spin Dynamics ◽  
Resonance Energy ◽  
Magnetic Scattering ◽  
Doping Dependence ◽  
Dynamical Spin ◽  
Spin Response

Within the kinetic energy driven superconducting mechanism, the dynamical spin response of the bilayer cuprate superconductors is studied. It is shown that there are two nondegenerate magnetic modes with odd and even symmetries, respectively, due to the bilayer interaction in the bilayer cuprate superconductors. Although the magnetic scattering in both odd and even symmetries shows an hour-glass-shaped dispersion, the commensurate magnetic resonance energy in the odd symmetry has a domelike shape of the doping dependence, while the commensurate magnetic resonance energy in the even symmetry decreases with increasing doping.

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