Anion names from parent hydrides

Names of substituted derivatives of anions are formed from parent hydride names modified as above (see Sections IR-6.4.4 and IR-6.4.5) by further adding appropriate prefixes for the substituents. When numbering the structure, the position where a hydron was removed or a hydride ion was added takes precedence over the positions with substituents, as in Example 4 below. In many cases, additive names are common and acceptable alternatives. 

Anions obtained formally by loss of a hydron from a parent hydride (see Table 5.2 p. 99 for a list of parent hydride names) are conveniently named by the methods of substitutive nomenclature. 

There are also differences from Refs. 11 and 19 where some parent hydride-based anions were missing locants and had a charge number added. For example, in Ref. 19 one name for HNNH was hydrazide(2—), whereas it is now hydrazine-1,2-diide. 

The endings in anion names are ide (monoatomic or homopolyatomic species, heteropolyatomic species named from a parent hydride), ate (heteropolyatomic species named additively), and ite (used in a few names which are still acceptable but do not derive from current systematic nomenclature). When there is no ambiguity, the charge number may be omitted, as in Example 1 below. Parent hydride-based names do not carry charge numbers because the name itself implies the charge (Examples 3 and 4 below). 

An anion formally obtained by removal of one or more hydrons from a parent hydride is named by adding ide , diide , etc., to the parent name, with elision of a terminal e before ide but not in any other cases. Any necessary locants are placed immediately preceding the suffix. Locants for removed hydrons take precedence over locants for unsaturation, as in Example 10 below. 

Combined ending of names of anions resulting from the removal of a hydron from a parent hydride with an ane name, formed by adding the suffix ide , e.g. methanide, CH3. ... 

Suffix for names of anions formed by removal of one or more hydrons from a parent hydride, accompanied by locants and multiplicative prefixes as appropriate, e.g. hydrazinide, H2NNH hydrazine-1,2-diide, HNNH- disulfanediide, S22- methanide, CH3 . 

Both hydrogen isocyanide and methanidylidyneazanium are correct lUPAC names for HNC. Currently there is no Preferred lUPAC name. The second one is according to the substitutive nomenclature rules, derived from the parent hydride azane (NH3) and the anion methanide (C). 

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