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preface to fifteenth edition

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1.28 SECTION 1<br />

Complex linear polyamines are best designated by replacement nomenclature. These trivial names<br />

are retained: aniline, benzidene, phenetidine, <strong>to</strong>luidine, and xylidine.<br />

Thebivalent radical 9NH9 linked <strong>to</strong> two identical radicals can be denoted by the prefix<br />

imino-, as well as when it forms a bridge between two carbon ring a<strong>to</strong>ms. A trivalent nitrogen a<strong>to</strong>m<br />

linked <strong>to</strong> three identical radicals is denoted by the prefix nitrilo-. Thus ethylenediaminetetraacetic<br />

acid (an allowed exception) should be named ethylenedinitrilotetraacetic acid.<br />

1.1.3.8 Ammonium Compounds. Salts and hydroxides containing quadricovalent nitrogen are<br />

named as a substituted ammonium salt or hydroxide. The names of the substituting radicals precede<br />

theword ammonium, and then the name of the anion is added as a separate word. For example,<br />

(CH 3 ) 4 N I is tetramethylammonium iodide.<br />

When the compound can be considered as derived from a base whose name does not end in<br />

-amine, its quaternary nature is denoted by adding ium <strong>to</strong> the name of that base (with elision of e),<br />

substituent groups are cited as prefixes, and the name of the anion is added separately at the end.<br />

Examples are<br />

<br />

CHNH 6 5 3HSO4<br />

2<br />

[(C6H5NH 3) ] 2PtCl6<br />

Anilinium hydrogen sulfate<br />

Dianilinium hexachloroplatinate<br />

Thenames choline and betaine are retained for unsubstituted compounds.<br />

In complex cases, the prefixes amino- and imino- may be changed <strong>to</strong> ammonio- and iminio- and<br />

are followed by the name of the molecule representing the most complex group attached <strong>to</strong> this<br />

nitrogen a<strong>to</strong>m and are preceded by the names of the other radicals attached <strong>to</strong> this nitrogen. Finally<br />

the name of the anion is added separately. For example, the name might be 1-trimethylammonioacridinechlorideor<br />

1-acridinyltrimethylammonium chloride.<br />

When the preceding rules lead <strong>to</strong> inconvenient names, then (1) the unaltered name of the base<br />

may beused followed by thenameof theanion or (2) for salts of hydrohalogen acids only the<br />

unaltered name of the base is used followed by the name of the hydrohalide. An example of the<br />

latter would be 2-ethyl-p-phenylenediamine monohydrochloride.<br />

1.1.3.9 Azo Compounds. When the azo group (9N"N9) connects radicals derived from<br />

identical unsubstituted molecules, the name is formed by adding the prefix azo- <strong>to</strong> the name of the<br />

parent unsubstituted molecules. Substituents are denoted by prefixes and suffixes. The azo group<br />

has priority for lowest-numbered locant. Examples are azobenzene for C 6 H 5 9N"N9C 6 H 5 , azobenzene-4-sulfonic<br />

acid for C 6 H 5 9N"N9C 6 H 5 SO 3 H, and 2,4-dichloroazobenzene-4-sulfonic<br />

acid for ClC 6 H 4 9N"N9C 6 H 3 ClSO 3 H.<br />

When the parent molecules connected by the azo group are different, azo is placed between the<br />

complete names of the parent molecules, substituted or unsubstituted. Locants are placed between<br />

the affix azo and the names of the molecules <strong>to</strong> which each refers. Preference is given <strong>to</strong> the more<br />

complex parent molecule for citation as the first component, e.g., 2-aminonaphthalene-1-azo-<br />

(4-chloro-2-methylbenzene).<br />

In an alternative method, the senior component is regarded as substituted by RN"N9, this<br />

group R being named as a radical. Thus 2-(7-phenylazo-2-naphthylazo)anthracene is the name by<br />

this alternative method for the compound named anthracene-2-azo-2-naphthalene-7-azobenzene.<br />

1.1.3.10 Azoxy Compounds. Wheretheposition of theazoxy oxygen a<strong>to</strong>m is unknown or immaterial,<br />

the compound is named in accordance with azo rules, with the affix azo replaced by azoxy.<br />

When the position of the azoxy oxygen a<strong>to</strong>m in an unsymmetrical compound is designated, a prefix<br />

NNO- orONN- is used. When both the groups attached <strong>to</strong> the azoxy radical are cited in the name<br />

of thecompound, theprefix NNO- specifies that the second of these two groups is attached directly

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