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is named "diazene"
,
and the groups derived from it, i.e., 
and 
, are named systematically as diazenyl and diazenediyl, respectively
(see R-3.1.4).
R-5.3.3.1 Azo compounds. Compounds with the general structure 
, where R and 
may be alike or different, are known generically as
"azo compounds". However, these compounds may be more systematically named substitutively as derivatives of the parent hydride diazene.
A monoazo compound with the general structureExamples to R-5.3.3.1
in which R is substituted by a principal characteristic group is named on the basis of the parent hydride, RH, substituted by an
organyldiazenyl group, 
. If both R and are substituted by the same number of the principal characteristic group, a multiplicative name (see R-0.2.3.3.10)
may be used.
Bisazo compounds and more complex analogues are named on the basis of the parent structure "diazene", in the absence of a more preferred parent compound.Examples to R-5.3.3.1
R-5.3.3.2 Azoxy compounds. N-Oxides of azo compounds having the general structureExamples to R-5.3.3.1
or 
are known generically as "azoxy
compounds" and are named by adding the separate word "oxide" to the name of the corresponding azo compound (see R-5.3.3.1). In an unsymmetrical
compound, the position of the azoxy oxygen atom is expressed by the locant 1 or 2.
An azoxy compound in which the general structure isExamples to R-5.3.3.2
or 
, in which R is substituted by a principal characteristic group, is named on the basis of the parent hydride,
RH, substituted by the -azoxy group in which the position of the oxygen atom is denoted by the prefix NNO-, ONN-, or NON-, as appropriate.
R-5.3.3.3 Diazonium compounds. Compounds with the general structureExample to R-5.3.3.2
are named by adding the suffix "-diazonium" to the name of the parent hydride RH
followed by the name of the ion 
as a separate word.
R-5.3.3.4 Azo compounds with the general structure R-N=N-X should be named as derivatives of the parent structure diazene, HN=NH.Examples to R-5.3.3.3
R-5.3.3.5 Diazo compounds. Compounds containing a group N2 attached by one nitrogen atom to one carbon atom are named by adding a prefix "diazo-" to the name of the parent hydride.Examples to R-5.3.3.4
Examples to R-5.3.3.5
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