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Related Experiment Videos

Absolute Rate Constants for alpha-Amide Radical Reactions.

Osama M. Musa1, Seung-Yong Choi, John H. Horner

  • 1Department of Chemistry, Wayne State University, Detroit, Michigan 48202.

The Journal of Organic Chemistry
|October 24, 2001
PubMed
Summary

This study used laser flash photolysis to investigate the cyclization kinetics of alpha-amide radicals. These radicals, acting as radical clocks, showed reaction rates similar to alkyl analogues, with some steric hindrance observed.

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Area of Science:

  • Organic Chemistry
  • Physical Chemistry
  • Reaction Kinetics

Background:

  • Alpha-amide radicals are important intermediates in organic synthesis.
  • Understanding their cyclization and reaction kinetics is crucial for reaction design.

Purpose of the Study:

  • To determine the cyclization rate constants of specific alpha-amide radicals.
  • To use these radicals as "radical clocks" for indirect kinetic studies.
  • To compare the reactivity of alpha-amide radicals with alkyl and alpha-ester analogues.

Main Methods:

  • Laser flash photolysis was used to generate alpha-amide radicals from PTOC esters.
  • Kinetic measurements were performed at various temperatures.
  • Tin hydride trapping was employed to quantify reaction rates.

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Main Results:

  • Rate constants for 5-exo cyclizations of secondary alpha-amide radicals were similar to alkyl analogues.
  • Steric effects were observed to reduce cyclization rates for tertiary alpha-amide radicals and 6-exo cyclizations.
  • Rate constants for tin hydride trapping of secondary alpha-amide radicals matched those of secondary alpha-ester radicals.

Conclusions:

  • Alpha-amide radicals exhibit reactivity comparable to alkyl and alpha-ester analogues in cyclization reactions.
  • Steric factors significantly influence the cyclization pathways and rates of these radicals.
  • The study provides valuable kinetic data for alpha-amide radical reactions, aiding synthetic strategy development.