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Polycyclic Hydrocarbons, Aromatic

Definition: A major group of unsaturated cyclic hydrocarbons containing two or more rings. The vast number of compounds of this important group, derived chiefly from petroleum and coal tar, are rather highly reactive and chemically versatile. The name is due to the strong and not unpleasant odor characteristic of most substances of this nature. (From Hawley's Condensed Chemical Dictionary, 12th ed, p96)

Polycyclic Hydrocarbons, Aromatic Categories.
Acenaphthenes - Tricyclic ethylene-bridged naphthalene derivatives. They are found in petroleum residues and coal tar and used as dye intermediates, in the manufacture of plastics, and in insecticides and fungicides.
Anthracenes - A group of compounds with three aromatic rings joined in linear arrangement.
Benzocycloheptenes
Fluorenes - A family of diphenylenemethane derivatives.
Indenes - A family of fused-ring hydrocarbons isolated from coal tar that act as intermediates in various chemical reactions and are used in the production of coumarone-indene resins.
Naphthacenes - Polyacenes with four ortho-fused benzene rings in a straight linear arrangement. This group is best known for the subclass called TETRACYCLINES.
Naphthalenes - Two-ring crystalline hydrocarbons isolated from coal tar. They are used as intermediates in chemical synthesis, as insect repellents, fungicides, lubricants, preservatives, and, formerly, as topical antiseptics.
Phenalenes - A group of AROMATIC HYDROCARBONS that have three rings joined as a triad around a single carbon atom so all three are conjoined, in contrast to a linear arrangement (ANTHRACENES) or angular arrangement (PHENANTHRENES).
Phenanthrenes
Pyrenes - A group of condensed ring hydrocarbons.
Spiro Compounds - A group of compounds consisting in part of two rings sharing one carbon atom in common.

Polycyclic Hydrocarbons, Aromatic Definitions and Terms

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