Intramolecular cyclization of [o-(arylthio)phenyl]ethenes. synthesis and crystal structure of 1-arylbenzo[b]thiophenium salts
作者:Tsugio Kitamura、Shin-ichi Soda、Hironobu Kawasato、Hiroshi Taniguchi、Motoo Shiro
DOI:10.1016/s0040-4020(01)81871-8
日期:1993.6
1-arylbenzo[b]thiophenium salts (4) are prepared by bromine-induced intramolecular cyclization of [o-(arylthio)phenyl]ethenes (3). The substituent and solvent effects on the formation of the 1-arylbenzo[b]thiophenium salts 4 are described. The reaction with iodine monochloride provides the improved yields of 2-unsubstituted and 2-methyl-1-phenylbenzo[b]thiophenium salts 4. The single crystal structure of 1
通过溴诱导的[ o-(芳硫基)苯基]乙烯(3)的分子内环化反应,制备了新型的1-芳基苯并[b]噻吩鎓盐(4)。描述了取代基和溶剂对1-芳基苯并[b]噻吩鎓盐4的形成的影响。与一氯化碘的反应提高了2-未取代的和2-甲基-1-苯基苯并[b]噻吩鎓盐4的收率。1,2,3-三苯基苯并[b]噻吩高氯酸盐的单晶结构(4 b:XCIO 4)表明硫原子周围的键是金字塔形排列的。与非稠合苯环相关的硫碳键长为1.784Å,五元环中的SC键长为1.762和1.790Å。硫周围的键角为92.1、103.1和107.0°。观察到硫与高氯酸根阴离子的氧之间的原子间距离相对较短(3.092Å)。