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LANGE'S HANDBOOK OF CHEMISTRY

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ORGANIC COMPOUNDS 1.35<br />

remain when each bridge is replaced by two hydrogen atoms. The locant for 9CO9 is cited before<br />

that for the ester oxygen atom. An additional carbon atom is incorporated into this structure as<br />

compared to the -olide.<br />

These trivial names are permitted: -butyrolactone, -valerolactone, and -valerolactone. Names<br />

based on heterocycles may be used for all lactones. Thus, -butyrolactoneis also tetrahydro-2furanoneor<br />

dihydro-2(3H)-furanone.<br />

Lactides, intermolecular cyclic esters, are named as heterocycles. Lactams and lactims, containing<br />

a 9CO9NH9 and 9C(OH)"N9 group, respectively, are named as heterocycles, but they may<br />

also be named with -lactam or -lactim in place of -olide. For example,<br />

(1) 2-Pyrrolidinone<br />

(2) 4-Butanelactam<br />

1.1.3.20 Nitriles and Related Compounds. For acids whose systematic names end in -carboxylic<br />

acid, nitriles arenamed by adding thesuffix -carbonitrilewhen the9CN group replaces the<br />

9COOH group. Thecarbon atom of the9CN group is excluded from the numbering of a chain<br />

to which it is attached. However, when the triple-bonded nitrogen atom is considered to replace<br />

three hydrogen atoms at the end of the main chain of an acyclic hydrocarbon, the suffix -nitrile is<br />

added to the name of the hydrocarbon. Numbering begins with the carbon attached to the nitrogen.<br />

For example, CH 3CH 2CH 2CH 2CH 2CN is named (1) pentanecarbonitrile or (2) hexanenitrile.<br />

Trivial acid names are formed by changing the endings -oic acid or -ic acid to -onitrile. For<br />

example, CH 3CN is acetonitrile. When the 9CN group is not thehighest priority group, the9CN<br />

group is denoted by the prefix cyano-.<br />

In order of decreasing priority for citation of a functional class name, and the prefix for substitutive<br />

nomenclature, are the following related compounds:<br />

Functional group Prefix Radicofunctional ending<br />

9NC Isocyano- Isocyanide<br />

9OCN Cyanato- Cyanate<br />

9NCO Isocyanato- Isocyanate<br />

9ONC — Fulminate<br />

9SCN Thiocyanato- Thiocyanate<br />

9NCS Isothiocyanato- Isothiocyanate<br />

9SeCN Selenocyanato- Selenocyanate<br />

9NCSe Isoselenocyanato- Isoselenocyanate<br />

1.1.3.21 Peroxides. Compounds of thetypeR9O9OH arenamed (1) by placing thenameof<br />

theradical R beforetheword hydroperoxide or (2) by use of the prefix hydroperoxy- when another<br />

parent name has higher priority. For example, C 2H 5OOH is ethyl hydroperoxide.<br />

Compounds of thetypeR 1 O9OR 2 arenamed (1) by placing thenames of theradicals in alphabetical<br />

order before the word peroxide when the group 9O9O9 links two chains, two rings,<br />

or a ring and a chain, (2) by useof theaffix dioxy to denotethebivalent group 9O9O9 for<br />

naming assemblies of identical units or to form part of a prefix, or (3) by use of the prefix epidioxywhen<br />

the peroxide group forms a bridge between two carbon atoms, a ring, or a ring system.

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