作者:R. M. Acheson、D. R. Harrison
DOI:10.1039/j39700001764
日期:——
S-Alkyl-thiophenium, -benzo[b]thiophenium and -dibenzo[b,d]thiophenium salts have been obtained by treatment of the corresponding thiophens with alkyl halides in the presence of silver tetrafluoroborate, or similar reagents. Their u.v. spectra resemble those of corresponding sulphoxides and sulphones, rather than those of the parent thiophen. The n.m.r. spectrum of 3-bromo-1-ethylbenzo[b]thiophenium
通过在四氟硼酸银或类似试剂的存在下用烷基卤化物处理相应的噻吩,可获得S-烷基噻吩盐,-苯并[ b ]噻吩盐和-二苯并[ b,d ]噻吩盐。它们的紫外光谱类似于相应的亚砜和砜,而不是母体噻吩的紫外光谱。3-溴-1-乙基苯并[ b ]噻吩四氟硼酸盐和类似化合物的nmr光谱表明,乙基是作为ABX 3系统出现的,已通过计算机模拟。结论是,S-烷基与含硫环不共面。在质谱仪中S-烷基很容易丢失,但是噻吩环也发生膨胀。盐是强效的烷基化剂。