A sulfonamide (compound) is a compound that contains this group. The general formula is RSO2NH2, where R is some organic group. For example, "methanesulfonamide" is CH3SO2NH2. Any sulfonamide can be considered as derived from a sulfonic acid by replacing a hydroxyl group with an amine group.
Sulfonamides can be prepared in the laboratory in many ways. For example, by the reaction of sulfonyl chlorides with amines in the synthesis of sulfonylmethylamide. A readily available sulfonyl chloride source is tosyl chloride.
Triflimide or triflimidic acid HN(Tf)2 (bis(trifluoromethane)sulfonimide) is the formal adduct of triflic acid and ammonia. Phenyl triflimide is a triflating reagent. The related metal triflimidates are used as catalysts. The anion bistriflimide is hydrophobic.
The related sulfinamides (R(S=O)NHR) are amides of sulfinic acids (R(S=O)OH) (see sulfinyl). Chiral sulfinamides such as tert-butanesulfinamide, p-toluenesulfinamide   and 2,4,6-trimethylbenzenesulfinamide  are relevant to asymmetric synthesis.
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