The photoelectron (PE.) spectra of thirteen methyl-substituted [2.2]paracyclophanes have been recorded and analyzed, to assess the influence of methyl-substitution on their ionization energies. It is shown that this influence is qualitatively and quantitatively the same as for benzenes and other π-systems. Comparison with the previous results obtained for the [2r]cyclophanes (r=2 to 6) strongly suggests
记录并分析了13个甲基取代的[2.2]对环环烷的光电子(PE。)光谱,以评估甲基取代对其电离能的影响。结果表明,该影响在质量和数量上与苯和其他π系统相同。与先前对[2 r ]环烷(r = 2至6)获得的结果进行比较,强烈表明,烷基/π系统相互作用的超共轭模型比归纳模型更合适。