In contrast to their carbocyclic aniline analogues, N,N-diarylsubtituted 2-aminothiophenes are not protonated at their N-atoms but at the 5-position or, to a smaller extent, at the 3-position of the thiophene nucleus giving rise to cationic species of the Wheland type. However, 5-formyl and 5-acetyl-substituted 2-(N,N-diarylamino)thiophenes are protonated at the corresponding carbonyl moieties. This
与它们的碳环苯
胺类似物相比,N , N - 二芳基取代的 2-
氨基
噻吩不在它们的N -原子处质子化,而是在 5-位,或者在较小程度上,在
噻吩核的 3-位产生阳离子惠兰型的物种。然而,5-甲酰基和5-乙酰基取代的2-( N,N-二芳基
氨基)
噻吩在相应的羰基部分被质子化。这一发现不仅有助于深入了解N , N -二取代 2-
氨基
噻吩的亲电取代机制,而且还允许通过用 CF 3处理其非
氘化母体化合物来制备
氘化 2-
氨基
噻吩酷。