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R-126.96.36.199 Lactones. Inrtamolecular esters of hydroxy carboxylic acids are "lactones" and are named as heterocycles or by substituting "-olactone" for the "-ic acid" ending of a trivial name of a hydroxy acid, or "-lactone" for the "-ic acid" ending of a systematic "-oic acid" name for the nonhydroxylated parent acid, and inserting a locant designating the position of the hydroxy group between the "o" and "lactone"
Heterocycles in which one or more (but not all) rings of a polycyclic ring system are lactones are named bu adding the suffix "-carbolactone" (denoting a cyclic group) to the name of the ring system left after the residue is replaced by two hydrogen atoms, preceded by a pair of locants indicating the points of attachment of the carbonyl group and the oxygen atom of the lactone, respectively; the locant for the carbonyl group is cited first, and, if there is a choice, is the lower locant. Multiplying prefixes and pairs of locants separated by a colon denote the precence of two or more lactone rings.
Example to R-188.8.131.52
R-184.108.40.206 Sultones. Intramolecular esters of hydroxy sulfonic acids are called "sultones" and are named as heterocycles or by citing the term "sultone" denoting the cyclic group after the name of the appropriate parent hydride preceded by a pair of locants describing the points of attachment of the sulfonyl group and oxygen atom, respectively; the locant for the sulfonyl group is cited first and, if there is a choice, is the lower locant. Multiplying prefixes and pairs of locants separated by a colon are used to indicate two or more sultone rings.
Examples to R-220.127.116.11
R-18.104.22.168 Lactams and lactims. Nitrogen analogues of lactones having the group as part of a ring or ring system are called generically "lactams" and their tautomers, , are "lactims". These compounds are named as heterocyclic compounds or in accordance with R-22.214.171.124 using "-lactam" or "-lactim", respectively, in place of "-lactone".
Examples to R-126.96.36.199
Names such as "propiolactam" and "butyrolactim" are not included in these recommendations.
R-188.8.131.52 Sultams. Nitrogen analogues of sultones having the group as a part of a ring are named as heterocycles or in accordance with R-184.108.40.206 using "sultam" in place of "sultone". The locant for the point of attachment of the sulfonyl group is cited first and, where there is a choice, has preference over the imino group for lower locant.
Examples to R-220.127.116.11
Examples to R-18.104.22.168
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