1H NMR spectrum of 8,13-dichloro-1,2,3,4-tetrafluoro-9-methyltriptycene at low temperature, where internal rotation of the methyl group is frozen, shows that 1-F couples to the ap proton of the methyl group with a coupling constant of 8.7 Hz and to the sc protons with 6.1 Hz.
8,13-二
氯-1,2,3,4-四
氟-9-甲基三茂
铁在低温下的1 H NMR谱图表明,甲基的内旋被冻结了,表明1-F偶联到了P的ap质子上。甲基的偶合常数为8.7 Hz,sc质子的偶合常数为6.1 Hz。