... AND TADASHI OKUYAMA~ Department of Chemistry, Texas Tech University, Lubbock, Texas 79409 Received February 4, 1972 ... Thianthrene (4)18 and other organic ~ulfides'~~~0 are oxidized to sulfoxides by dinitrogen tetroxide. ... J . Org. Chem., Vol. 37, No. 17, 1972 2695 ...