作者Xobile ("哆"比雷)
看板Chemistry
標題[問題] Ring Strain
時間Sun Nov 7 18:04:25 2010
Each H<->H eclipsing interaction in ethane costs about 4.0KJ/mol.
1. How many such interactions are present in cyclopropane?
2. What fraction of the overall 115KJ/mol strain energy of cyclopropane
is due to torsional strain?
第一題我怎麼看都只有二組 H<->H eclipse 而答案是6組
是因為從三個不同的碳(三種角度?)看過去所以是6?
H H
\ /
C ─ C
/ \ / \
H C H
/ \
H H
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◆ From: 118.169.185.61
1F：→ x06Cc:如果把cyclopropane擺在紙面 紙面上三個H兩兩 eclipse 11/07 22:53
2F：→ x06Cc:有三組，紙面下也有三組 所以六組 11/07 22:53
3F：→ Xobile:謝謝 11/08 21:49