Diphenylacetylenes are obtained when alkyllithium reagents are added to 3-aryl-2-fluorobenzothiophenes at low temperature. The aromatic ring-opening mechanism involves a nucleophilic addition of the alkyllithium to the sulfur atom of the thiophene. The resulting 2,2-diaryl-1-fluorovinyl anion subsequently undergoes a Fritsch-Buttenburg-Wiechell rearrangement to afford the diphenylacetylene.
当在低温下将烷基
锂试剂添加到3-芳基-2-
氟苯并噻吩时,可以得到二
苯乙炔。芳香环开环机制涉及烷基
锂对
噻吩硫原子的亲核加成。生成的2,2-二芳基-1-
氟乙烯阴离子随后经历Fritsch-Buttenburg-Wiechell重排,最终形成二
苯乙炔。