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(b) When the oxygen atom linking the two acid residues of an acid anhydride is replaced by sulfur, the anhydride is named according to the principles of Rule C-491 but with the word "anhydride" replaced by "thioanhydride".
Examples to Rule C-643.1(a)
643.2 - Cyclic anhydrides formed by loss of water between a sulfur acid and a carboxylic acid group, and the analogous imides, are named by replacing "acid" in the name of the corresponding acid by "cyclic anhydride" or "imide", respectively; alternatively, they are named as cyclic compounds by the rules of Section B, with use of "oxide" and a locant to denote oxygen attached to sulfur.
Examples to Rule C-643.1(b)
See Recommendations'93 R-5.7.2, R-3.4, R-5.7.7
Examples to Rule C-643.2
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