Sulfur Acids and their Derivatives Containing Sulfur Directly Linked to an Organic Radical Rule C-642
642.1 - If an oxygen atom of a sulfonic or sulfinic acid group is replaced by a bivalent nitrogenous group, the ending sulfonic acid or
sulfinic acid of the name of the acid is modified as follows (compare Rule C-451.1 and C-451.2), derivatives being named as customary for other acids:
642.2 - (a) If both sulfonyl-oxygen atoms are replaced by the same nitrogenous group, the syllable "di" is placed immediately before the name prescribed for that group in the
Examples to Rule C-642.1
(b) If the two nitrogenous groups are different, the ending for these groups is "hydrazonimidic", "-hydroximimidic", or "-hydrazonohydroximic", as appropriate.
(c) A letter "o" is inserted to separate two consonants on such endings (see Rule C-641.9).
642.3 - If sulfur replaces oxygen in the acids named in Rules C-642.1 and C-642.2, a prefix "thio-" or "dithio-" is placed before the syllable "sulf",
an O- or S- prefix being used if necessary.
Examples to Rule C-642.2
642.4 - Radicals derived by loss of a hydroxyl group from an acid named in the three preceding rules are named by changing the ending "-ic acid" of the name of the acid to "-oyl".
Examples to Rule C-642.3
See Recommendations'93 R-5.7.2, R-3.4
Examples to Rule C-642.4
(For the change of benzenesulfonimidoyl to phenylsulfonimidoyl see the Note to Rule C-631.1.)
Sulfur Acids and Their Derivatives Containing Sulfur Directly Linked to an Organic Radical Rule C-643
Sulfur Acids and Their Derivatives in which Sulfur is Linked Only Through Oxygen to the Organic Radical Rule C-651
Sulfur Acids and Their Derivatives in which Sulfur is Linked Only Through Nitrogen or Through Nitrogen and Oxygen to the Organic Radical Rule C-661,
Sultones and Sultams Rule C-671
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