Diazonium and Related Groups

Rule C-931

931.1 - Compounds are named by adding the suffix "-diazonium" to the name of the parent substance RH, the whole being followed by the name of the ion .

Examples to Rule C-931.1

Benzenediazonium chloride

8-Hydroxy-2-naphthalenediazonium tetrafluoroborate

931.2 - Compounds RN=NX are named by adding, after the name of the parent compound RH, the syllables "diazo" joined to the designation of the atom or group X.

Note: These compounds are distinguished from azo compounds by the fact that the group X is not joined to the nitrogen atom by a link from a carbon atom (except for the cyanide).

Examples to Rule C-931.2



Sodium benzenediazosulfonate

931.3 - Compounds RN=N-OM, where M is a metal, are named metal diazoates.

Example to Rule C-931.3

Sodium benzenediazoate

931.4 - Compounds containing a group N2 attached by one atom to carbon are named by adding a prefix "diazo-" for this substituent to the name of the parent compound.

Examples to Rule C-931.4


Ethyl diazoacetate


931.5 - Compounds in which a group -N=N- forms part of a ring are named as (a) cyclic compounds (see Section B) or (b), if the group creates a spiro ring system, by use of the prefix "-azi".

Examples to Rule C-931.5

(a) Ethyl 3H-diazirine-3-carboxylate

(b) 3-Azi-5b-androstan-17-one

See Recommendations'93 R-

Groups Containing Three or More Contiguous Nitrogen Atoms C-941, C-942
Compounds Containing a N=C-N or N=C=N Group C-951, C-952, C-953, C-954, C-955, C-956
Compounds Containing a N-C(-N)=N Group C-961, C-962
Compounds Containing a N-CO-N or Related Group C-971, C-972, C-973, C-974, C-975
Compounds Containing a N-CO-N-N or More Complex Group C-981, C-982, C-983, C-984, C-985

This HTML reproduction of Sections A, B and C of IUPAC "Blue Book" is as close as possible to the published version [see Nomenclature of Organic Chemistry, Sections A, B, C, D, E, F, and H, Pergamon Press, Oxford, 1979. Copyright 1979 IUPAC.] If you need to cite these rules please quote this reference as their source.

Published with permission of the IUPAC by Advanced Chemistry Development, Inc.,, +1(416)368-3435 tel, +1(416)368-5596 fax. For comments or suggestions please contact