Abbreviated hydrogen names for certain anions

In functional replacement nomenclature, substitution of =0 or —OH groups in parent oxoacids (such as O— S, O— 00, OH— Cl, etc.) is indicated by the use of infixes or prefixes as exemplified below (see Ref. 1, Section P-67.1). 

Example 5 in Section IR-8.1 demonstrates the use of the infixes for OH— C1 and O — S to arrive at the name arsonochloridothioic O-acid for the derived parent HAsCl(OH)S = [AsClH(OH)S], required for naming the organic derivative  

Functional replacement names may, of course, be used for the derived parent acids themselves. However, this amounts to introducing an additional system which is not needed in inorganic nomenclature. As mentioned above, additive and substitutive nomenclature can 

Nevertheless, in Table IR-8.2 several inorganic species are listed which can be regarded as derived from species in Table IR-8.1 by various replacement operations, and for which the common names are in fact derived by the above prefix method (e.g. thiosulfuric acid ). 

A problem that would arise with the general use of the prefix variant of functional replacement names is illustrated by the thio acids. The names trithiocarbonic acid, tetrathiophosphoric acid, etc., would lead to anion names trithiocarbonate, tetrathiophosphate, etc., which appear to be additive names but are incorrect as such because the ligand prefix is now sulfido or sulfanediido [thus giving trisulfidocarbonate(2—),tetrasulfidophosphate(3—), etc.]. Section P-65.2 of Ref. 1 prescribes the infix-based name carbonotrithioic acid, leading to the anion name carbonotrithioate, which will not be mistaken for an additive name. 

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