Rule B-6. Cationic Hetero Atoms 6.1 - According to the "a" nomenclature, heterocyclic compounds containing cationic hetero atoms are named in conformity with the preceding rules by
replacing "oxa-", "thia-", "aza-", etc., by "oxonia-", "thionia-", "azonia-", etc., the anion being designated in the usual way. Cationic hetero atoms follow immediately after the
corresponding noncationic atoms: oxonia follows oxa, thionia follows thia, azonia follows aza, etc. (cf. Table B-I). (cf. Rule C-82 and C-83).
See Recommendations'93 R-5.8.2
Examples to Rule B-6.1
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