Elimination of Sulfur Dioxide in Alkanesulfonamides. Formation of 2-Arylhydrazono-3,3,3-trifluoropropylamines from 2-Arylhydrazono-3,3,3-trifluoropropanesulfonamides - Takahashi, Masahiko; Muta, Shigeru (Synthesis, 1997)