2.2 Nomenclature Types for Substituted Systems
2.2.7.2
Cations
99
In documenting the nomenclature rules for organic cations, four different
naming modes can be defined; treatment of cations within the conventions
of "a" nomenclature has already been noted on p. 52.
a) Cations derived from the ... onium prototypes compiled in Table 12.
Table 12. "Onium" prototypes in descending order of priority
Ion
H4NEIl
H4P H4AsEll
H4Sb El l
H4BiEll
H30e
H3SEIl
H3SeEll
H3TeEll
H2FEIl
H2Cle
H2BrEll
H21E1l
Ell
Class name
Ammonium
Phosphonium
Arsonium
Stibonium
Bismuthonium
Oxonium
Sulfonium
Selenonium
Telluronium
Fluoronium
Chloronium
Bromonium
lodonium
Cation as prefix
Ammonio
Phosphonio
Arsonio
Stibonio
Bismuthonio
Oxonio
Sulfonio
Selenonio
Telluronio
Fluoronio
Chloronio
Bromonio
lodonio
e ..
I
(C2Hsh2H Diethyloxonium,
< f'( >
2,2' -Biphenylyleniodonium
(Biphenyl-2,2' -diyliodonium)
Me2~.+.~ ~Me3 (4-Dimethylsulfoniophenyl)trimethyl~
ammonium
b) Cations formed by fixation of a proton (hydron, see. p. 183) or another
positive group onto a heteroatom of a trivially or systematically named
compound are specified by the ending '" ium attached to that name
(see also p. 63). If necessary such a proton is treated like an indicated
hydrogen.