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作者cestlavia (cestlavia)

看板post-b.test

標題[問題] 有機 torsional strain 與 steric stain

時間Thu May 30 20:44:23 2013

題目 https://imgs.cc/image/r6k1J23#.UadIF0AybbA

我的問題是第6題選 B 是torsional 的關係
那第七題為什麼要選 II是比較多steric strain 而不是more torsional strain
以下是我查到的東西但不懂如何運用

1.torsional strain(扭轉張力):兩個相鄰原子的取代基鍵結電子對在空間上的排斥
力.需用Newman projection來判斷, eclipsed是指兩取代基完全相對(夾角0度),
扭轉張力最大(2.9kcal/mol);staggered是指兩取代基完全錯開(夾角60度),扭轉
張力最小(0kcal/mol);其他角度則沒有特定名稱,扭轉張力介於兩者之間

23.steric strain又被稱為凡得瓦排斥,是因為兩原子(團)的電子雲互相排斥.與國中
所學的庫倫定律中同性相斥的道理相同,所以兩原子(團)在空間上的排列會盡量
錯開.例如椅形環己烷上的大取代基總是在equiatorial(赤道向)上,以增加兩個取
代基在空間上的距離

煩請高手解答謝謝

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※ 編輯: cestlavia 來自: 219.84.247.216 (05/30 20:46)

→ senonno1:因為第七題兩個結構都是stagger,但前者是anti,後者是gauc 05/30 20:53

→ senonno1:h,Gauch結構上有兩個甲基基團的排斥,誠如上面名詞解釋,st 05/30 20:55

→ senonno1:eric strain又被稱為凡得瓦排斥,是因為兩原子(團)的電子 05/30 20:56

→ senonno1:雲互相排斥,故選擇steris strain 05/30 20:57

→ cestlavia:所以steric是用來比較在anti與stagger時原子團的關係？ 05/30 21:18

→ cestlavia:是這樣嗎？因為夾角度一樣就是原子團的差別 05/30 21:18

→ senonno1:可以這麼說,因為steric就是用來比較''基團''間的排斥關係 05/30 21:22

→ cestlavia:謝謝senonnol~~我懂了開心 05/30 21:30

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torsional strain steric strain差異在 [問題] 有機torsional strain 與steric stain - 看板post-b.test 的推薦與評價

UadIF0AybbA 我的問題是第6題選B 是torsional 的關係那第七題為什麼要選II是比較多steric strain 而不是more torsional strain 以下是我查到的東西但不懂如何 ... ... <看更多>

torsional strain steric strain差異在 What is the difference between steric strain and torsional strain? 的推薦與評價

TL;DR Torsional strain can be thought as the repulsion due to electrostatice forces between electrons in adjacent MOs. Meanwhile steric ... ... <看更多>

torsional strain steric strain差異在 Newman Projection Basics (Torsional Strain, Steric ... - YouTube 的推薦與評價

DO NOT FORGET TO SUBSCRIBE!LinkedIn: https://www.linkedin.com/in/kevan-j-english-91b9b11b7/Snapchat: ... ... <看更多>

torsional strain steric strain差異在 Strain In Organic Molcules - YouTube 的推薦與評價

A discussion of Torsional Strain, Steric Strain, and Angle Strain. ... <看更多>

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