Site-Selective Shpol'skii Spectrometry of Sulfur-, Oxygen-, and Nitrogen-Containing Aromatic Compounds in Complex Samples

1988 ◽  
Vol 42 (5) ◽  
pp. 731-740 ◽  
Author(s):  
A. E. Elsaiid ◽  
R. Walker ◽  
S. Weeks ◽  
A. P. D'Silva ◽  
V. A. Fassel
Keyword(s):  
Aromatic Compounds ◽  
Heterocyclic Compounds ◽  
Direct Determination ◽  
Emission Spectra ◽  
Complex Samples ◽  
Biological Studies ◽  
Polycyclic Aromatic ◽  
Site Selective ◽  
First Time ◽  
Derivatives Of

Laser excited Shpol'skii spectrometry (LESS) was utilized to directly determine nitrogen (N-), oxygen (O-), and sulfur (S-) heterocyclic compounds in solvent refined coal (SRC-II), petroleum crude oil, and carbon black. Characteristic quasilinear LESS excitation and emission spectra of the heterocyclic compounds are presented for the first time under site-selective conditions. Deuterated analogs of dibenzothiophene and dibenzofuran were utilized for quantitation. Site-selective fluorescence spectra of aminopyrene derivatives of polycyclic aromatic compounds (PAC) are also presented for the first time. The potential for utilizing the LESS technique in critical environment and biological studies for the direct determination of N-, O-, and S-heterocyclic compounds and substitutional derivatives of parent PAC has been demonstrated.

scholarly journals CRYSTALLINE AND HETEROCYCLYC AROMATIC COMPOUNDS IN GEORGIAN PETROLEUM

World Science ◽  
2021 ◽  
Author(s):  
Natela Khetsuriani ◽  
Vladimer Tsitsishvili ◽  
Elza Topuria ◽  
Irina Mchedlishvili ◽  
Zaza Molodinashvili
Keyword(s):  
Polycyclic Aromatic Hydrocarbons ◽  
Aromatic Hydrocarbons ◽  
Aromatic Compounds ◽  
High Intensity ◽  
Oil Wells ◽  
Automated System ◽  
Polycyclic Aromatic ◽  
The Individual ◽  
First Time ◽  
Individual Composition

The individual composition of polycyclic aromatic hydrocarbons has been studied in high boiling (340–590°) fractions of Norio oil (wells 200, 201) which are characterized by high content of aromatic hydrocarbons and high intensity fluorescence. The eluates obtained by adsorption fractionation of aromatic hydrocarbons separated by aniline and concentrates of their crystalline components have been studied by GC, MS and GC-MS methods. For analysis of the obtained data an automated system of mass deconvolution and identification (AMDIS) was used. In the eluates under investigation the following structures were identified: indenes, tetralines, dinaphtilbenzenes, naphthalenes, fluorenes, phenantrenes, antracenes, mono- and polyalkyl derivatives ofnaphtofluorene and phenantrene, and terpeniles. In crystal samples of the eluates the banzantracene, chrizene, their methyl-, dimethyl and trymethylanaloges, phenantrene derivatives, antracenes and pyrenes were identified. The heterocyclic analogues of polycyclic aromatic hydrocarbons likemethylbenzoanthracenes, benzonaphthothiophenes, benzocarbazoles and dibenzthiophene were identified in Georgian oils for the first time.

Synthesis and Functionalization of Coumarin-Pyrazole Scaffold: Recent Development, Challenges and Opportunities

2021 ◽  
Vol 18 ◽  
Author(s):  
Nitin K. Jadhav ◽  
Balkrishna R. Kale ◽  
Mohammad S. Alam ◽  
Vishwas B. Gaikwad ◽  
Virendra Prasad ◽  
...  
Keyword(s):  
Heterocyclic Compounds ◽  
Structural Motif ◽  
Pharmacological Properties ◽  
Lead Compounds ◽  
Drug Molecules ◽  
Dna And Rna ◽  
Biological Studies ◽  
Challenges And Opportunities ◽  
First Time ◽  
Made In

: Heterocycles are the main structural motif of DNA and RNA and play crucial role in various chemical reactions of metabolisms. Therefore, heterocyclic compounds show good physiological and pharmacological properties. Coumarin and pyrazole scaffold present in many commercial drug molecules and natural products. This review gives first time gives an overview of the progress made in the synthesis and functionalization of coumarin-pyrazole hybrid heterocycle. It also includes discussion on the possible reactive sites of heterocycles, functionalization and mechanistic pathways to incorporate pyrazole pharmacophore unit in synthesis. Several synthesis and biological studies revealed that combination of coumarin-pyrazole moiety is a prominent structural motif to find lead compounds in drug discovery.

ÉTARD REACTION: II. POLYCYCLIC AROMATIC AND HETEROCYCLIC COMPOUNDS

1958 ◽  
Vol 36 (6) ◽  
pp. 949-951 ◽  
Author(s):  
Owen H. Wheeler
Keyword(s):  
Aromatic Compounds ◽  
Heterocyclic Compounds ◽  
Polycyclic Aromatic Compounds ◽  
Chromyl Chloride ◽  
Polycyclic Aromatic

Polycyclic aromatic compounds can, in a number of cases, be oxidized with chromyl chloride, whereas heterocyclic compounds are unaffected.

scholarly journals Site-selective covalent functionalization at interior carbon atoms and on the rim of circumtrindene, a C36H12 open geodesic polyarene

2014 ◽  
Vol 10 ◽  
pp. 956-968 ◽  
Author(s):  
Hee Yeon Cho ◽  
Ronald B M Ansems ◽  
Lawrence T Scott
Keyword(s):  
Aromatic Hydrocarbons ◽  
Electrophilic Aromatic Substitution ◽  
Coupling Reactions ◽  
Computational Results ◽  
Aromatic Substitution ◽  
Covalent Functionalization ◽  
Polycyclic Aromatic ◽  
Site Selective ◽  
Geodesic Polyarenes ◽  
Derivatives Of

Circumtrindene (6, C36H12), one of the largest open geodesic polyarenes ever reported, exhibits fullerene-like reactivity at its interior carbon atoms, whereas its edge carbons react like those of planar polycyclic aromatic hydrocarbons (PAHs). The Bingel–Hirsch and Prato reactions – two traditional methods for fullerene functionalization – afford derivatives of circumtrindene with one of the interior 6:6 C=C bonds modified. On the other hand, functionalization on the rim of circumtrindene can be achieved by normal electrophilic aromatic substitution, the most common reaction of planar PAHs. This peripheral functionalization has been used to extend the π-system of the polyarene by subsequent coupling reactions and to probe the magnetic environment of the concave/convex space around the hydrocarbon bowl. For both classes of functionalization, computational results are reported to complement the experimental observations.

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