LANGE'S HANDBOOK OF CHEMISTRY

TABLE 1.2 Fused Polycyclic Hydrocarbons (Continued)
17. Triphenylene
18. Pyrene
ORGANIC COMPOUNDS 1.9
19. Chrysene
20. Naphthacene
lative double bonds and which have no accepted trivial name (Table 1.2) are named by prefixing to
the name of the parent ring or ring system designations of the other components. The parent name
should contain as many rings as possible (provided it has a trivial name) and should occur as far as
possible from the beginning of the list in Table 1.2. Furthermore, the attached component(s) should
be as simple as possible. For example, one writes dibenzophenanthrene and not naphthophenanthrene
because the attached component benzo- is simpler than napththo-. Prefixes designating attached
components are formed by changing the ending -ene into -eno-; for example, indeno- from indene.
Multiple prefixes are arranged in alphabetical order. Several abbreviated prefixes are recognized; the
parent is given in parentheses:
Acenaphtho- (acenaphthylene) Naphtho- (naphthalene)
Anthra- (anthracene) Perylo- (perylene)
Benzo- (benzene) Phenanthro- (phenanthrene)
For monocyclic prefixes other than benzo-, the following names are recognized, each to represent
the form with the maximum number of noncumulative double bonds: cyclopenta-, cyclohepta-,
cycloocta-, etc.
Isomers are distinguished by lettering the peripheral sides of the parent beginning with a for the
side 1,2, and so on, lettering every side around the periphery. If necessary for clarity, the numbers
of the attached position (1,2, for example) of the substituent ring are also denoted. The prefixes are
cited in alphabetical order. The numbers and letters are enclosed in square brackets and placed
immediately after the designation of the attached component. Examples are
Benz[]anthracene Anthra[2,1-]naphthacene