Highly fluorinated heterocycles. Part V. The preparation and some reactions of tetrafluorothiophen and some polyfluorothiophens
作者:J. Burdon、J. G. Campbell、I. W. Parsons、J. C. Tatlow
DOI:10.1039/j39710000352
日期:——
Tetrafluorothiophen has been prepared by dehydrofluorination of 3H/4H-hexafluorothiolan by molten alkali. It did not react with bromine nor did it polymerise rapidly, unlike tetrafluorofuran. It reacted with sodium methoxide with displacement of the 2-fluorine, as was proved by an independent synthesis of the other possible isomer, 2,3,5-trifluoro-4-methoxythiophen. 2,5-Difluorothiophen and 2,5-di
四氟噻吩是通过熔融碱将3 H / 4 H-六氟噻喃脱氟而制得的。与四氟呋喃不同,它不与溴反应,也不迅速聚合。如另一种可能的异构体2,3,5-三氟-4-甲氧基噻吩的独立合成所证明,它与甲醇钠反应生成2-氟取代。还已经制备了2,5-二氟噻吩和2,5-二氟-3-甲氧基噻吩。甲氧基噻吩均迅速聚合。在多氟噻吩的19 F nmr光谱中,α-氟共振到β的高场。同样,2–5 F–F耦合较大(26–31 Hz)。