Properties of Excited Ketyl Radicals of Benzophenone Analogues Affected by the Size and Electronic Character of the Aromatic Ring Systems

2006 ◽  
Vol 12 (6) ◽  
pp. 1610-1617 ◽  
Author(s):  
Masanori Sakamoto ◽  
Xichen Cai ◽  
Mamoru Fujitsuka ◽  
Tetsuro Majima
Keyword(s):  
Aromatic Ring ◽  
Ring Systems ◽  
Electronic Character

A novel series of histone deacetylase inhibitors incorporating hetero aromatic ring systems as connection units

2003 ◽  
Vol 13 (21) ◽  
pp. 3817-3820 ◽  
Author(s):  
Yujia Dai ◽  
Yan Guo ◽  
Michael L. Curtin ◽  
Junling Li ◽  
Lori J. Pease ◽  
...  
Keyword(s):  
Histone Deacetylase ◽  
Aromatic Ring ◽  
Histone Deacetylase Inhibitors ◽  
Ring Systems

Synthesis of Polyfunctional Aromatic Ring Systems (Phloroglucide Analogues) under Microwave Irradiation.

ChemInform ◽  
2003 ◽  
Vol 34 (44) ◽  
Author(s):  
Ali Khalafi-Nezhad ◽  
Mohammad Navid Soltani Rad ◽  
Gholam Hossein Hakimelahi
Keyword(s):  
Microwave Irradiation ◽  
Aromatic Ring ◽  
Ring Systems

A Highly Selective Cascade Approach to Diverse Aromatic Ring Systems from Simple Aromatic Aldehydes and Propiolates

2006 ◽  
Vol 8 (6) ◽  
pp. 1241-1244 ◽  
Author(s):  
Yan-Guang Wang ◽  
Sun-Liang Cui ◽  
Xu-Feng Lin
Keyword(s):  
Aromatic Ring ◽  
Aromatic Aldehydes ◽  
Ring Systems

Synthesis, Characterization, and Electronic Structures of Porphyrins Fused with Polycyclic Aromatic Ring Systems

2016 ◽  
Vol 22 (41) ◽  
pp. 14730-14738 ◽  
Author(s):  
Tetsuo Okujima ◽  
John Mack ◽  
Jun Nakamura ◽  
Gugu Kubheka ◽  
Tebello Nyokong ◽  
...  
Keyword(s):  
Aromatic Ring ◽  
Electronic Structures ◽  
Ring Systems ◽  
Polycyclic Aromatic

scholarly journals Rattling motion of proton through five membered aromatic ring systems

2020 ◽  
Vol 1183 ◽  
pp. 112825
Author(s):  
Somesh Chamoli ◽  
Aniruddha Chakraborty
Keyword(s):  
Aromatic Ring ◽  
Ring Systems

Notizen: Cyclophanes, XXX The Crystal Structure of [2.4]Paracyclophane at —95°C

1989 ◽  
Vol 44 (7) ◽  
pp. 860-862 ◽  
Author(s):  
Peter G. Jones ◽  
Zissis Pechlivanidis ◽  
Henning Hopf
Keyword(s):  
Crystal Structure ◽  
Bond Length ◽  
Aromatic Ring ◽  
Single Bond ◽  
Orthorhombic Space Group ◽  
Ring Systems ◽  
Space Group ◽  
Benzylic Carbon ◽  
Central Bond

[2.4]Paracyclophane crystallizes in the orthorhombic space group Pbca with cell constants (at —95°C) a = 1151.5(5), b = 1832.9(7), c = 1304.1(4) pm. The structure was refined to R = 0.053 for 1626 unique observed reflections. The aromatic ring systems are inclined to each other at an angle of 21°. The longer bridge is capable of more relaxation than the shorter, as is reflected in the non-bonded distances 279, 386 pm between bridgehead atoms and in the smaller displacements of the associated benzylic carbon atoms from the aromatic ring planes. The central bond length of the longer bridge (151.8 pm) is shorter than would be expected for a single bond.

Bis-Wittig Reactions in the Synthesis of Nonbenzenoid Aromatic Ring Systems

Synthesis ◽  
1975 ◽  
Vol 1975 (12) ◽  
pp. 765-780 ◽  
Author(s):  
K. Peter C. VOLLHARDT
Keyword(s):  
Aromatic Ring ◽  
Ring Systems ◽  
Wittig Reactions

Aromatic nitrogen bridgehead compounds. I. The dipyrido[1,2-c:2',1'-e]-imidazolium and related cations

1965 ◽  
Vol 18 (11) ◽  
pp. 1819 ◽  
Author(s):  
IC Calder ◽  
WHF Sasse
Keyword(s):  
Aromatic Ring ◽  
Vinyl Ketone ◽  
Methyl Vinyl Ketone ◽  
Imidazolium Cation ◽  
Ring Systems ◽  
Methyl Vinyl ◽  
Phenyl Derivative ◽  
Acyl Derivatives

The preparation of the dipyrido[l,2-c:2?,1?-e]imidazolium cation (I) and some substituted cations from 2,2'-bipyridyls and gem-dihalides is described. As expected, (I) exhibits reactions typical for both a-electron excessive and n-electron deficient aromatic ring systems. Thus, (I) may be brominated, methylated, benzoylated, and acetylated at the 6-position; the cation (I) also adds to methyl vinyl ketone. The action of hydroxyl ions in the presence of air produces the corresponding 2,2'-bipyridyls, as does the action of light and air. The rate of bromination of the 6-phenyl derivative (XII) to give the 2,10-dibromo cation (XVI) is comparable to that of naphthalene. The 6-acyl derivatives (XIX) are converted to the parent cation (I) by the action of either acid or base.

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