Polycyclic Aromatic Hydrocarbons, Four-Ring Compounds

POLYCYCLIC AROMATIC HYDROCARBONS, FOUR-RING COMPOUNDS 

TOOOl 3M Company, 3M Empore Extraction Disk T0017 Advanced Soil Technologies, Thermal Desorption T0025 Akzo Nobel MPP Systems, Macro Porous Polymer (MPP) T0048 Aqualogy BioRemedics, Environmental Quality PetroKlenz 

T0142 Carlo Environmental Technologies, Inc., Medium-Temperature Thermal Desorption (MTTD) 

T0293 Enzyme Technologies, Inc., Dissolved Oxygen In Situ Treatment (DO IT) T0294 Enzyme Technologies, Inc., Multienzyme Complex (MZC) 

T0309 Fixed-Bed Soil Biofilters—General T0348 GHEA Associates, Soil Washing Technology 

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Polycyclic Aromatic Hydrocarbons with More Than Five Fused Rings Polycyclic Aromatic Hydrocarbons, Four-Ring Compounds Benzo(a)anthracene Chrysene... 

Chrysene under Polycyclic Aromatic Hydrocarbons, Four-Ring Compounds... 

Polycyclic Aromatic Hydrocarbons with Two or Three Fused Rings Polycyclic Aromatic Hydrocarbons PAH PNA POM Polycyclic Hydrocarbons, Nonalternant Compounds with Four Fused Rings Fluoranthene... 

Such a molecule can be stabilized by a system of delocalized Ji-electrons, which is closed into a toroid of 10 aromatic rings. Reactive sites are four CH groups, which are at the ends of this molecular tube. Such substances belong apparently to a new class of organic compounds, which is intermediate between planar polycyclic aromatic hydrocarbons and three-dimensional fullerenes, nanotubes. Quantum-chemical calculations of the electronic and spatial structure of C32H8 and some other molecules indicate that they have an increased reactivity and semiconductor properties. 

The number of possible structures (Table 3.2) of polycyclic aromatic hydrocarbons increases with the total number of six-membered rings. For a molecule like pyrene, which is formed from four rings, six other ring arrangements are possible (Figure 3.15), leading to the compounds naphthacene, benz[a]anthracene, chrysene, benzo[c]phenanthrene, triphenylene, pyrene and benzo[a]phenalenyl. 

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