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First Year University Organic Chemistry Help

Hello, I am currently working on questions regarding conformations, energy and angles. It was a computation assignment using a computer program, so answers that are slightly off in my results are okay. I put the questions first and the results are below that.

QUESTIONS:
1) Rank energies in order of increasing stability and explain why.
-I understand this question and the reasoning behind it, there is no need to expand further on this. The ranking is: 1,1-diisopropylethene, (Z)-1,2-diisopropylethene, (E)-1,2-diisopropylethene.

2) Rank in order of increasing C=C-C bond angles and explain why the order of ranking is different than in 1).
Ranking: 1,1-diisopropylethene, (E)-1,2-diisopropylethene, (Z)-1,2-diisopropylethene
* this is the part I need help with… I am not sure of the reasoning behind this ranking *

RESULTS:
- (E)-1,2-diisopropylethene: Energy: -102.17kj/mol Angle (along C=C-C): 122.81
- (Z)-1,2-diisopropylethene: Energy: -102.10kj/mol Angle (along C=C-C): 125.13
-1,1-diisopropylethene: Energy: -89.49kj/mol Angle (along C=C-C): 122.68

Thank you in advance for any help I receive! It is much appreciated.
-Sarah
(edited 10 years ago)
Hi there,

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Original post by sarahall243
Hello, I am currently working on questions regarding conformations, energy and angles. It was a computation assignment using a computer program, so answers that are slightly off in my results are okay. I put the questions first and the results are below that.

QUESTIONS:
1) Rank energies in order of increasing stability and explain why.
-I understand this question and the reasoning behind it, there is no need to expand further on this. The ranking is: 1,1-diisopropylethene, (Z)-1,2-diisopropylethene, (E)-1,2-diisopropylethene.

2) Rank in order of increasing C=C-C bond angles and explain why the order of ranking is different than in 1).
Ranking: 1,1-diisopropylethene, (E)-1,2-diisopropylethene, (Z)-1,2-diisopropylethene
* this is the part I need help with… I am not sure of the reasoning behind this ranking *

RESULTS:
- (E)-1,2-diisopropylethene: Energy: -102.17kj/mol Angle (along C=C-C): 122.81
- (Z)-1,2-diisopropylethene: Energy: -102.10kj/mol Angle (along C=C-C): 125.13
-1,1-diisopropylethene: Energy: -89.49kj/mol Angle (along C=C-C): 122.68

Thank you in advance for any help I receive! It is much appreciated.
-Sarah


It must be steric hindrance ...

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