20. The energy of the trans conformation of the anion is 7.57 kJ/mol lower than the cis conformation, and the energy barrier of the conformation invert is only 3.05 kJ/mol. It shows the conformation invert reaction is controlled by thermodynamics and will happen easily. The result can explain the epimerization of 2-benzyl-2-ethoxycarbonyl-cyclopentanol in Williamson ether synthesis.
其中，醛基与酯羰基形成的反式构象的负离子能量比顺式构象的负离子能量低7.57 kJ/mol，而构象翻转的活化能仅为3.05 kJ/mol，说明构象翻转为热力学控制的反应，顺式构象即能够自发翻转呈反式构象，解释了在Williamson醚合成反应中顺、反构型翻转的现象。
invert 词典解释
1. 使反向;使倒置
If you invert something, you turn it the other way up or back to front.
e.g. Invert the cake onto a cooling rack.
把蛋糕倒扣在冷却架上。
e.g. ...a black inverted triangle.
一个黑色的倒三角
2. 使颠倒
If you invert something, you change it to its opposite.
e.g. They may be hoping to invert the presumption that a defendant is innocent until proved guilty.
他们可能有望颠覆“被告在证实有罪之前是无辜的”这一假设。
e.g. ...a telling illustration of inverted moral values.
是非颠倒的道德观的有力证明
invert 单语例句
1. Place chabei upside down over wen xiang bei and invert the two without allowing any tea to escape.
invert 英英释义
verb
1. invert
1. turn inside out or upside down
Synonym: turn back reverse
2. invert
2. reverse the position, order, relation, or condition of
e.g. when forming a question, invert the subject and the verb
Synonym: reverse
3. make an inversion (in a musical composition)
e.g. here the theme is inverted
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