Consider a Newman projection of butane shown. Calculate the energy from the strain present in this conformation. H₂ H H H H H H H HH CH3 H H H3C CH3 H H CH3 -H H -H CH3 -H H CH3/CH3 gauche 0.9 kcal/mol steric strain H/H eclipsed bond 1.0 kcal/mol torsional strain CH3/H eclipsed 1.4 kcal/mol torsional/steric strain CH3/CH3 eclipsed 2.6 kcal/mol torsional/steric strain H H H H CH3 CH3

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Chapter1: Chemical Foundations
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In kcal/mol

Consider a Newman projection of butane
shown. Calculate the energy from the strain
present in this conformation.
A
H
H
H
.II.
H
H
H
CH3
H
H
H
H3C CH3
I
H
CH3
-H
H
CH3/CH3 gauche
0.9 kcal/mol steric strain
-H
H
H/H eclipsed bond
1.0 kcal/mol torsional strain
CH3/H eclipsed
-H 1.4 kcal/mol torsional/steric strain
CH3
CH3/CH3 eclipsed
2.6 kcal/mol torsional/steric strain
H
H
H
H
-CH3
CH3
Transcribed Image Text:Consider a Newman projection of butane shown. Calculate the energy from the strain present in this conformation. A H H H .II. H H H CH3 H H H H3C CH3 I H CH3 -H H CH3/CH3 gauche 0.9 kcal/mol steric strain -H H H/H eclipsed bond 1.0 kcal/mol torsional strain CH3/H eclipsed -H 1.4 kcal/mol torsional/steric strain CH3 CH3/CH3 eclipsed 2.6 kcal/mol torsional/steric strain H H H H -CH3 CH3
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