ChemInform Abstract: NMR of Polycyclic Aromatics

1986 ◽  
Vol 17 (7) ◽  
Author(s):  
P. E. HANSEN
Keyword(s):  
Polycyclic Aromatics

Preparation and luminescence properties of isoquinoline-nucleated polycyclic aromatics

2020 ◽  
Vol 172 ◽  
pp. 107803 ◽  
Author(s):  
Yanmei Li ◽  
Xinyu Li ◽  
Tianzhi Yu ◽  
Wenming Su ◽  
Youjia Wang ◽  
...  
Keyword(s):  
Luminescence Properties ◽  
Polycyclic Aromatics

Selective Detection of Dibenzodioxin, Dibenzofuran and Some Small Polycyclic Aromatics

1998 ◽  
Vol 134 (1-6) ◽  
pp. 139-163 ◽  
Author(s):  
J. Velazquez ◽  
L. A. Voloboueva ◽  
T. A. Cool
Keyword(s):  
Selective Detection ◽  
Polycyclic Aromatics

Partial Fluorination Overcomes Herringbone Crystal Packing in Small Polycyclic Aromatics†

2005 ◽  
Vol 7 (6) ◽  
pp. 1067-1068 ◽  
Author(s):  
Don M. Cho ◽  
Sean R. Parkin ◽  
Mark D. Watson
Keyword(s):  
Crystal Packing ◽  
Polycyclic Aromatics

Wilzbach Tritation studies. III. A study of physical variables affecting exchange in the polycyclic aromatics

1967 ◽  
Vol 20 (9) ◽  
pp. 1875 ◽  
Author(s):  
JL Garnett ◽  
SW Law
Keyword(s):  
Nitric Oxide ◽  
Gas Phase ◽  
Polycyclic Hydrocarbon ◽  
Simple Relationship ◽  
Polycyclic Aromatics ◽  
Radical Scavengers ◽  
Effect Of Particle Size ◽  
Labelling Process ◽  
Physical Variables ◽  
Radical Processes

The effect of particle size of substrate and tritium gas pressure on the efficiency of Wilzbach tritiation of crystalline polycyclic hydrocarbons has been investigated. The hydrocarbons studied included naphthalene, biphenyl, phenanthrene, chrysene, pyrene, m- and p-terphenyls, and acridine. No simple relationship between ionization potential and tritium incorporation was observed. The effect of radical scavengers such as nitric oxide and moderators such as helium on the labelling process have been examined. Tritium incorporation in a polycyclic hydrocarbon is enhanced lf gas exposure occurs in the presence of benzoic acid. The results are discussed in terms of current theories proposed for tritium labelling based on gas-phase studies. In the condensed phase present data show that radical processes are important in Wilzbach labelling. This has been confirmed by a preliminary e.s.r. examination of naphthalene and anthracene in the presence of tritium gas.

Selective skeletal editing of polycyclic arenes using organophotoredox dearomative functionalization

2022 ◽  
Author(s):  
Wei Wang ◽  
Peng Ji ◽  
Cassondra Davies ◽  
Feng Gao ◽  
Jing Chen ◽  
...  
Keyword(s):  
Hydrogen Atom ◽  
Late Stage ◽  
Hydrogen Atom Transfer ◽  
Complex Structures ◽  
Computational Results ◽  
Polycyclic Aromatics ◽  
Rapid Synthesis ◽  
Electronic Nature ◽  
Strategic Approach ◽  
Harsh Conditions

Abstract Reactions that lead to destruction of aromatic ring systems often require harsh conditions and, thus, take place with poor selectivities. Selective partial dearomatization of fused arenes is even more challenging but it can be a strategic approach to creating versatile, complex polycyclic frameworks. Herein we describe a general organophotoredox approach for the chemo- and regioselective dearomatization of structurally diverse polycyclic aromatics, including quinolines, isoquinolines, quinoxalines, naphthalenes, anthracenes and phenanthrenes. The success of the new method for chemoselective oxidative rupture of aromatic moieties relies on precise manipulation of the electronic nature of the fused polycyclic arenes. Experimental and computational results show that the key to overcoming the intrinsic thermodynamic and kinetic unfavorability of the dearomatization process is an ultimate hydrogen atom transfer (HAT) step, which enables dearomatization to predominate over the otherwise favorable aromatization pathway. We show that this strategy can be applied to rapid synthesis of biologically valued targets and late-stage skeletal remodeling en route to complex structures.

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