作者:H. Abele、A. Haas、M. Lieb、M. Schelvis
DOI:10.1016/s0022-1139(97)00033-x
日期:1997.8
2,2-Bis(trifluoromethyl)-4-methyl-2,5-dihydrothiophene (5), 2,2-bis(trifluoromethyl)-4-methyl-2,5-dihydroselenophene (6), 2-trifluoromethyl-2,4-dimethyl-2,5-dihydrothiophene (7) and 2-trifluoromethyl-2,4-dimethyl-2,5-dihydroselenophene (8) were prepared from 5,5,5-trifluoro-4-trifluoromethyl-2-methyl-penta-1,3-diene and 5,5,5-trifluoro-2,4-dimethyl-penta-1,3-diene by reaction with elemental sulphur
2,2-双(三氟甲基)-4-甲基-2,5-二氢噻吩(5),2,2-双(三氟甲基)-4-甲基-2,5-二氢硒吩(6),2-三氟甲基-2,由5,5,5-三氟-4-三氟甲基-2-甲基-苯甲酸酯制得4-二甲基-2,5-二氢噻吩(7)和2-三氟甲基-2,4-二甲基-2,5-二氢硒基苯醚(8)。与元素硫或硒反应生成五-1,3-二烯和5,5,5-三氟-2,4-二甲基-戊-1,3-二烯。用溴和HBr处理5,5,5-三氟-4-三氟甲基-戊-3-烯-2-酮和5,5,5-三氟-4-甲基-戊-3-烯-2-酮。分离出的1,4-二溴代产物未与K 2 S发生复分解反应。