ORGANIC CHEMISTRY Chapter 4 Potential energy diagram for rotation about the cc bond in ethane 重叠式构象 E 交叉式构象 H H H HCHH HH H H H H H H H 12. 1 kJ/mol 60° 120° 180 240旋转角度 Department of Chemistry, Xiamen University
ORGANIC CHEMISTRY Department of Chemistry, Xiamen University Chapter 4 Potential energy diagram for rotation about the C—C bond in ethane 60 120 180 240 E H H H H H H H H H HH H 重叠式构象 交叉式构象 H H H H H H H H H HH H 12.1 kJ / mol 旋转角度
ORGANIC CHEMISTRY Chapter 4 4.9 Conformational Analysis of Butane Department of Chemistry, Xiamen University
ORGANIC CHEMISTRY Department of Chemistry, Xiamen University Chapter 4 4.9 Conformational Analysis of Butane
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 University
ORGANIC 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
ORGANIC CHEMISTRY Chapter 4 Energy changes that arise from rotation about the c2-c3 bond of butane CH CH CH3 H 1 H 5 个HH CH3 CH CH CH H H CB◇ H 2 6 CH3 4 3.7 kJ/mol 15.9 kJ/mol 18.8 kJ/mol 120 240 300 360 旋转角度 Department of Chemistry, Xiamen University
ORGANIC CHEMISTRY Department of Chemistry, Xiamen University Chapter 4 Energy changes that arise from rotation about the C2—C3 bond of butane 60 120 180 240 300 360 E 3.7 kJ/mol 15.9 kJ/mol 18.8 kJ/mol CH3 H H H H CH3 CH3 H H HH CH3 H H H CH3H CH3 H CH3 HH H CH3 H H CH3 H H CH3 CH3 H H H H CH3 1 2 3 4 5 6 CH3 H H HH CH3 1 旋转角度
ORGANIC CHEMISTRY Chapter 4 Compounds Anti conformations (%) CICH, CHCI 70 Brchchobr 84~91 PhcHochoPh >90 H O H H H H H H Department of Chemistry, Xiamen University
ORGANIC CHEMISTRY Department of Chemistry, Xiamen University Chapter 4 Compounds Anti conformations (%) ClCH2CH2Cl ~70 BrCH2CH2Br 84~91 PhCH2CH2Ph >90 H O H H H Cl H H O H H H O H H