Types of Strain

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15 Terms

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When does max steric strain happen?

When two methyl groups are completely eclipsing

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Gauche

Methyl groups near each other

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Flagpole-Flagpole

H atoms close to each other

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1,3-Diaxial

Methyl group in axial position

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Anti-Conformer Strain

No steric or torsional strain

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<p>Bond Angle Strain</p>

Bond Angle Strain

Deviation from expected bond angle of sp3 carbon

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Torsional Strain

Always occurs in eclipsed conformations, never occurs in staggered conformations

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Strains Present in Cyclopropane

BAS + TS

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Strains Present in Cyclobutane

BAS + TS

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Strains Present in Cyclopentane

TS

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<p>Planar Cyclohexane Strains</p>

Planar Cyclohexane Strains

BAS + TS

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Chair Cyclohexane Strains

No BAS, TS or SS

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<p>Boat Cyclohexane Strains</p>

Boat Cyclohexane Strains

SS (flagpole-flagpole) + TS

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<p>Twist Boat Cyclohexane Strains</p>

Twist Boat Cyclohexane Strains

MINIMAL BAS + TS

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<p>Half Chair Cyclohexane Strains</p>

Half Chair Cyclohexane Strains

TS + BAS