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preface to fifteenth edition

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ORGANIC COMPOUNDS 1.29<br />

<strong>to</strong> 9N(O)9; theprefix ONN- specifies that the first of these two groups is attached directly <strong>to</strong><br />

9N(O)9. When only one parent compound is cited in the name, the prefixed ONN- and NNOspecify<br />

that the group carrying the primed and unprimed substituents is connected, respectively, <strong>to</strong><br />

the 9N(O)9 group. Theprefix NON- signifies that the position of the oxygen a<strong>to</strong>m is unknown;<br />

the azoxy group is then written as 9N 2 O9. For example,<br />

2,2,4-Trichloro-NNO-azoxybenzene<br />

1.1.3.11 Boron Compounds. Molecular hydrides of boron are called boranes. They are named<br />

by using a multiplying affix <strong>to</strong> designate the number of boron a<strong>to</strong>ms and adding an Arabic numeral<br />

within parentheses as a suffix <strong>to</strong> denote the number of hydrogen a<strong>to</strong>ms present. Examples are pentaborane(9)<br />

for B 5 H 9 and pentaborane(11) for B 5 H 11 .<br />

Organic ring systems are named by replacement nomenclature. Three- <strong>to</strong> ten-membered monocyclic<br />

ring systems containing uncharged boron a<strong>to</strong>ms may be named by the specialist nomenclature<br />

for heterocyclic systems. Organic derivatives are named as outlined for substitutive nomenclature.<br />

The complexity of boron nomenclature precludes additional details; the text by Rigaudy and Klesney<br />

should beconsulted.<br />

1.1.3.12 Carboxylic Acids. Carboxylic acids may be named in several ways. First, 9COOH<br />

groups replacing CH 3 9 at the end of the main chain of an acyclic hydrocarbon are denoted by<br />

adding -oic acid <strong>to</strong> thenameof thehydrocarbon. Second, when the9COOH group is theprincipal<br />

group, thesuffix -carboxylic acid can beadded <strong>to</strong> thenameof theparent chain whosenameand<br />

chain numbering does not include thecarbon a<strong>to</strong>m of the9COOH group. The former nomenclature<br />

is preferred unless use of the ending -carboxylic acid leads <strong>to</strong> citation of a larger number of carboxyl<br />

groups as suffix. Third, carboxyl groups are designated by the prefix carboxy- when attached <strong>to</strong> a<br />

group named as a substituent or when another group is present that has higher priority for citation<br />

as principal group. In all cases, the principal chain should be linked <strong>to</strong> as many carboxyl groups as<br />

possible even though it might not be the longest chain present. Examples are<br />

CH CH CH CH CH CH COOH<br />

3 2 2 2 2 2<br />

C H COOH<br />

6 11<br />

(1) Heptanoic acid<br />

(2) 1-Hexanecarboxylic acid<br />

(2) Cyclohexanecarboxylic acid<br />

(3) 2-(Carboxymethyl)-1,4-hexanedicarboxylic acid<br />

Removal of the OH from the 9COOH group <strong>to</strong> form theacyl radical results in changing the<br />

ending -oic acid <strong>to</strong> -oyl or the ending -carboxylic acid <strong>to</strong> -carbonyl. Thus the radical<br />

CH 3 CH 2 CH 2 CH 2 CO9 is named either pentanoyl or butanecarbonyl. When the hydroxyl has not<br />

been removed from all carboxyl groups present in an acid, the remaining carboxyl groups are denoted<br />

by the prefix carboxy-. For example, HOOCCH 2 CH 2 CH 2 CH 2 CH 2 CO9 is named 6-carboxyhexanoyl.

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