Six-membered Heterocyclic compounds Pyridine吡啶 1. Structure: H H p orbital 芳香性 H 较强的碱性 sp-orbital H H
二. Six-membered Heterocyclic compounds Pyridine 吡啶 1. Structure: C5H5N 芳香性 较强的碱性 N
Six-membered Heterocyclic compounds N Kekule's structure Aromaticity ES.变难 0.87 兀电子云的分布一 1.01 1.01阝 NS.变易 0.84 0.84 C N Oxidation难 1.43 Reduction易 Basicity
N N N or or Kekule’s structure N 1.43 0.84 1.01 1.01 0.84 0.87 Aromaticity ? 电子云的分布 E.S. 变难 N.S. 变易 Oxidation 难 Reduction 易 Basicity Six-membered Heterocyclic compounds
Six-membered Heterocyclic compounds 2. Physical properties (1)μ(偶极矩) Dipole moment H 方向一致 C u=741×1038c.m 3.90×10-38cm (2) Solubility:吡啶可以与水以任意比例互溶
2. Physical properties (1) (偶极矩) Dipole moment = 7.4110-38 c.m 3.90 10-38 c.m I C 方向一致 Six-membered Heterocyclic compounds (2) Solubility: 吡啶可以与水以任意比例互溶