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Chemistry 121, Winter 2008, LA Tech
Conformations of cyclopentane
•In planar cyclopentane, there are 10 fully eclipsed C-H bonds, which create torsional strain of approximately 10 kcal/mol
•Puckering to an “envelope” conformation relieves part of this strain
•In an envelope conformation, eclipsed interactions are reduced but angle strain is increased slightly (105°)
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Envelope conformation
Planar conformation