Which Hydrogen Will the Base Extract?

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SUMMARY

The discussion centers on the extraction of alpha hydrogen by a base in the context of organic chemistry, specifically comparing acetophenone and chloroacetone. It highlights that the alpha hydrogen, which is not adjacent to the chlorine atom, is preferentially removed due to the influence of inductive and resonance effects. The pKa values of acetophenone and chloroacetone are critical in understanding this phenomenon, with the latter being more acidic due to the electron-withdrawing effect of chlorine. This analysis emphasizes the importance of these concepts in predicting reaction outcomes.

PREREQUISITES
  • Understanding of organic chemistry principles, particularly acidity and basicity.
  • Familiarity with pKa values and their significance in chemical reactions.
  • Knowledge of inductive and resonance effects in molecular structures.
  • Experience with reaction mechanisms involving bases and hydrogen abstraction.
NEXT STEPS
  • Research the pKa values of acetophenone and chloroacetone for deeper insights.
  • Study the effects of inductive and resonance on acidity in organic compounds.
  • Explore reaction mechanisms involving alpha hydrogen abstraction in ketones.
  • Learn about the role of halogens in influencing acidity and reactivity in organic molecules.
USEFUL FOR

Chemistry students, organic chemists, and anyone interested in understanding the reactivity of carbonyl compounds and the influence of substituents on acidity.

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Homework Statement


See the pic (I know, its not clear but still).

2e0kydt.jpg

Homework Equations


The compound is reacting with a base. The pic shows the alpha hydrogen taken out by the base.
Why in both the compounds that alpha H is taken out which is not near Chlorine. Why not the H which is near the halogen?
 
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Think about inductive vs. resonance effects. Which one has a greater influence? What is the "pKa of acetophenone" vs "pKa of chloroacetone"? Those are good google terms...
 

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