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The trans form was found to be lower in energy, by 1.073 kcal/mol for N-methylformamide and by 2.459 kcal/mol for N-methylacetamide. In the
absence of entropy effects, these energy separations would suggest that the cis isomer should be present to the extent of 13.7% in
N-methylformamide and 1.45% in N-methylacetamide.
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