N,N'-Bis[p-butoxybenzylidene]-.alpha..alpha.'-bi-p-toluidine: thermally stable liquid crystal for unique gas-liquid chromatography separations of polycyclic aromatic hydrocarbons

1976 ◽  
Vol 48 (6) ◽  
pp. 809-813 ◽  
Author(s):  
George M. Janini ◽  
Gary M. Muschik ◽  
Walter L. Zielinski
Keyword(s):  
Polycyclic Aromatic Hydrocarbons ◽  
Liquid Chromatography ◽  
Liquid Crystal ◽  
Aromatic Hydrocarbons ◽  
Gas Liquid Chromatography ◽  
Thermally Stable ◽  
Polycyclic Aromatic

The Pyrolysis of ωω'-Diphenylalkanes

1962 ◽  
Vol 15 (1) ◽  
pp. 89 ◽  
Author(s):  
JW Sweating ◽  
JFK Wilshire
Keyword(s):  
Polycyclic Aromatic Hydrocarbons ◽  
Liquid Chromatography ◽  
Aromatic Hydrocarbons ◽  
Gas Liquid Chromatography ◽  
Partition Chromatography ◽  
Aromatic Substitution ◽  
Homolytic Aromatic Substitution ◽  
Aliphatic Carbon ◽  
Polycyclic Aromatic ◽  
Radical Processes

The pyrolysis of several ωω'-diphenylalkanes, C6H5(CH2)nC6H5, where n=1, 2, 3, 4, and 6, has been studied over a range of temperatures (550, 600, 650, and 700 �C). The products were analysed by a combination of gas-liquid chromatography, chromatography on alumina, and partition chromatography on acetylated cellulose. Below 700 �C, scission of the aliphatic carbon bonds was solely observed, whereas at 700 �C there were formed, in addition, polycyclic aromatic hydrocarbons arising from radical processes such as dimerization, intramolecular cyclization, and homolytic aromatic substitution (e.g. phenanthrene, chrysene, triphenylene, and 3,4-benzpyrene). The mode of formation of these and other products is discussed.

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