化学位移规律:烷烃 碳数n>4端甲基δc=13-14 δc>8c>δ CH2 >8 CH3 邻碳上取代基增多δc越大 取代烷烃:H3C-CH2— c H-c H-C h 13.922.834.7 2021/2/202021/2/20 化学位移规律：烷烃 取代烷烃: H3C C H2 C H2 C H2 C H3 13.9 22.8 34.7 碳数n >4 端甲基 C=13-14 C>CH> CH2 >CH3 邻碳上取代基增多C 越大