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preface to fifteenth edition

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ORGANIC COMPOUNDS 1.9<br />

TABLE 1.2<br />

Fused Polycyclic Hydrocarbons (Continued)<br />

17. Triphenylene<br />

19. Chrysene<br />

18. Pyrene<br />

20. Naphthacene<br />

lative double bonds and which have no accepted trivial name (Table 1.2) are named by prefixing <strong>to</strong><br />

the name of the parent ring or ring system designations of the other components. The parent name<br />

should contain as many rings as possible (provided it has a trivial name) and should occur as far as<br />

possible from the beginning of the list in Table 1.2. Furthermore, the attached component(s) should<br />

be as simple as possible. For example, one writes dibenzophenanthrene and not naphthophenanthrene<br />

because the attached component benzo- is simpler than napththo-. Prefixes designating attached<br />

components are formed by changing the ending -ene in<strong>to</strong> -eno-; for example, indeno- from indene.<br />

Multiple prefixes are arranged in alphabetical order. Several abbreviated prefixes are recognized; the<br />

parent is given in parentheses:<br />

Acenaphtho- (acenaphthylene) Naphtho- (naphthalene)<br />

Anthra- (anthracene) Perylo- (perylene)<br />

Benzo- (benzene) Phenanthro- (phenanthrene)<br />

For monocyclic prefixes other than benzo-, the following names are recognized, each <strong>to</strong> represent<br />

the form with the maximum number of noncumulative double bonds: cyclopenta-, cyclohepta-,<br />

cycloocta-, etc.<br />

Isomers are distinguished by lettering the peripheral sides of the parent beginning with a for the<br />

side 1,2, and so on, lettering every side around the periphery. If necessary for clarity, the numbers<br />

of the attached position (1,2, for example) of the substituent ring are also denoted. The prefixes are<br />

cited in alphabetical order. The numbers and letters are enclosed in square brackets and placed<br />

immediately after the designation of the attached component. Examples are<br />

Benz[]anthracene<br />

Anthra[2,1-]naphthacene

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