conformation-lecture

conformation-lecture - anti Butane Conformations Butane...

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1 anti Butane Conformations C C H 3 C C H 3 H H H H Butane Conformations sawhorse view down this axis to see Newman Projection H C H 3 H H C H 3 H Newman Projection anti-staggered anti-methyls - 180°
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2 eclipsed Butane Conformations Butane Conformations H C H 3 H H C H 3 H Newman Projection anti-staggered rotate front C by 60° H C H 3 H H 3 C H H CH 3 and H higher in energy by 3.8 kcal/mol CH 3 and H Newman Projection eclipsed
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3 gauche Butane Conformations Butane Conformations H C H 3 H H 3 C H H Newman Projection gauche-staggered rotate front C by 60° H C H 3 H H 3 C H H 0.9 kcal/mol higher in energy than the anti- staggered (lowest energy) conformation Newman Projection eclipsed 60°
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4 eclipsed Butane Conformations Butane Conformations H C H 3 H H 3 C H H Newman Projection gauche-staggered rotate front C by 60° CH 3 and CH 3 4.5 kcal/mol higher in energy than the anti-staggered conformation H C H 3 H H H C H 3 Newman Projection eclipsed
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Butane Energy Profile 5 E rotation 60° 120°
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conformation-lecture - anti Butane Conformations Butane...

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