| Green and efficient synthesis of sulfonamides catalyzed by n... 
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                            | Regioselective synthesis of N-substituted-4-substituted isot... 
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                            | Di-μ-hydroxy-bis (N, N, N′, N′-tetramethylenediamine)-copper... 
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                            | TiCl4-mediated direct N-alkylation of sulfonamides with inac... 
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                            | An explanation for the failure of aminomethanesulfonic acid ... 
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