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LANGE'S HANDBOOK OF CHEMISTRY

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ORGANIC COMPOUNDS 1.29<br />

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

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

the azoxy group is then written as 9N 2O9. 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 to designate the number of boron atoms and adding an Arabic numeral<br />

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

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

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

ring systems containing uncharged boron atoms 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 39 at the end of the main chain of an acyclic hydrocarbon are denoted by<br />

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

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

chain numbering does not include thecarbon atom of the9COOH group. The former nomenclature<br />

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

groups as suffix. Third, carboxyl groups are designated by the prefix carboxy- when attached to 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 to 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 (1) Heptanoic acid<br />

3 2 2 2 2 2<br />

(2) 1-Hexanecarboxylic acid<br />

C H COOH (2) Cyclohexanecarboxylic acid<br />

6 11<br />

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

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

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

CH 3CH 2CH 2CH 2CO9 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 2CH 2CH 2CH 2CH 2CO9 is named 6-carboxyhexanoyl.

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