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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 preceding rule.
Examples to Rule C-642.1
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.)
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