Formation, Structure, and Thionation of 1,2,4,5-Tetrathianes [<b><i>cis</i></b>- and<b><i>trans</i></b>-3,6-Bis(1,1,3,3-tetramethyl-4-oxo-4-phenylbutyl)-1,2,4,5-tetrathianes]
作者:Akihiko Ishii、Takenori Omata、Kazuyo Umezawa、Juzo Nakayama
DOI:10.1246/bcsj.73.729
日期:2000.3
2,2,4,4-Tetramethyl-1-phenyl-6,7-dithiabicyclo[3.1.1]heptane was treated with 2KHSO5·KHSO4·K2SO4 to yield cis- and trans-3,6-bis(1,1,3,3-tetramethyl-4-oxo-4-phenylbutyl)-1,2,4,5-tetrathianes. The formation mechanism of the tetrathianes is discussed. X-Ray crystallography disclosed that the cis- and trans-isomers take twist and chair conformations, respectively, in the solid state. Variable-temperature 1H NMR spectroscopy in solution showed that the cis-isomer takes a twist conformation exclusively in the temperature range, whereas the trans-isomer exists as an equilibrium mixture of chair and twist conformers. The cis-tetrathiane reacted with Lawesson's reagent at 50 °C to give the corresponding di-2-thianyl disulfide.
2,2,4,4-四甲基-1-苯基-6,7-二硫杂双环[3.1.1]庚烷用2KHSO5·KHSO4·K2SO4处理,得到顺式和反式3,6-双(1,1,3,3-四甲基-4-氧代-4-苯基丁基)-1,2,4,5-四硫环己烷。讨论了四硫环己烷的形成机理。X射线晶体学显示,在固态下,顺式和反式异构体分别采用扭曲和椅子构象。溶液中的可变温度1H NMR光谱显示,顺式异构体仅在温度范围内采用扭曲构象,而反式异构体以椅子和扭曲构象的平衡混合物形式存在。顺式四硫环己烷在50°C下与劳森试剂反应,得到相应的二-2-硫代二硫醚。