作者:Horst Hartmann、Christoph Heichert、Marion Wrackmeyer
DOI:10.1055/s-0030-1260178
日期:2011.10
By reaction of N,N′-tetraaryl-substituted succinic diamides with Lawesson’s reagent, a series of N,N′-tetraaryl-substituted 2,5-diaminothiophenes was prepared. The N,N′-tetrakis(4-bromophenyl)-2,5-diaminothiophene, thus available, was used as an educt for the synthesis of N,N′-tetrakis(4-diphenylaminophenyl)-2,5-diaminothiophene by reaction with four equivalents of diphenylamine in the presence of palladium as catalyst. Both the N,N′-tetraaryl-substituted 2,5-diaminothiophenes and the N,N′-tetrakis(4-diphenylaminophenyl)-2,5-diaminothiophene can be electrochemically oxidised in a stepwise manner via the corresponding radical cations into relatively stable dications. The latter compounds can also be oxidised into tetracationic species.
通过N,N′-四芳基取代的琥珀酸二胺与Lawesson试剂反应,合成了一系列N,N′-四芳基取代的2,5-二氨基噻吩。由此获得的N,N′-四(4-溴苯基)-2,5-二氨基噻吩被用作合成N,N′-四(4-二苯氨基苯基)-2,5-二氨基噻吩的原料,通过与四当量的二苯胺在钯催化剂的存在下反应。这些N,N′-四芳基取代的2,5-二氨基噻吩和N,N′-四(4-二苯氨基苯基)-2,5-二氨基噻吩都可以通过对应的自由基阳离子以逐步方式进行电化学氧化,形成相对稳定的双阳离子。后者化合物也可以被氧化成四阳离子物种。