ORGANIC CHEMISTRY Chapter 4 CH CH CH CH 600H CH 360 600 H H H 了b H ChBH 3 全重叠式 邻位交叉式 部分重叠式 Eclipsed Gauche Eclipsed CH The least stable conformation H、 H H H CH The most stable conformation 对位交叉式 优势构象 Anti Department of Chemistry, Xiamen UniversityORGANIC CHEMISTRY Department of Chemistry, Xiamen University Chapter 4 H CH3 H H H CH3 CH3 H H H H CH3 全重叠式 邻位交叉式 部分重叠式 H H H CH3H CH3 H CH3 H H H CH3 H H CH3 H H CH3 CH3 H H H H CH3 1 2 3 4 5 6 对位交叉式 部分重叠式 邻位交叉式 60O 60O 60O 60O 60O Eclipsed Gauche Anti Eclipsed Eclipsed Gauche The least stable conformation The least stable conformation The most stable conformation 优势构象 The most stable conformation 优势构象