Page 39 - Pharm.Org.Chem-I 02-06-05-101
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Example: n-Butane

  Energy changes that arise from rotation about the C2–C3 bond of butane

73

 Exception is 2-fluoroethanol which exists
 predominantly in gauche conformation due
 to intra-molecular hydrogen bonding
 (Restricted rotation).

74

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