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“n→π* Interactions Are Competitive with Hydrogen Bonds”

Organic Letters 2016, 18, 3614-3617 Sam Orke

Below is an excerpt: 

Because carbonyl groups can participate in both hydrogen bonds and n→π* interactions, these two interactions likely affect one another. Herein, enhancement of an amidic n→π* interaction is shown to reduce the ability of β-keto amides to tautomerize to the enol, indicating decreased hydrogen-bonding capacity of the amide carbonyl group. Thus, an n→π* interaction can have a significant effect on the strength of a hydrogen bond to the same carbonyl group.

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