pyrazoles and their cations were calculated using the AM1 approximation and their gas-phase basicities were estimated. Second, both the experimental and the AM1-calculated values were considered within the framework of the Taft–Topsom analysis of substituent effects. Comparison of the analyses for pyrazoles and pyridines led to the unexpected result that, in spite of differences in ring size and number
仅在4位取代的八个
吡唑气相碱度(R 4 = H,NO 2,
氟,
氯,CO 2 ç 2 ħ 5,CH 3,NH 2,1-
金刚烷基)是通过傅里叶变换离子回旋谐振。用两种方法处理实验值,首先通过将这些值与
AM1计算的质子亲和力进行比较。由于相关性相当好[ PA(计算)= -11·3 + 1·063 PA(实验),n = 8,r[0·984] = [0·984],使用
AM1近似计算了一组17种另外的4-取代的
吡唑及其阳离子,并估计了它们的气相碱度。其次,在Taft-Topsom取代基效应分析的框架内考虑了实验值和
AM1计算值。
吡唑和
吡啶分析的比较得出了意想不到的结果,尽管环大小和杂原子数不同,但两个系统的表现都非常相似。