The photochemistry of several amine+carbonyl compound systems has been studied in the gas phase and in solution. It is concluded that a radical-like process takes place in the former; the results suggest that hydrogen abstraction from N-H bonds probably takes place. The rate constants in the gas phase are considerably lower than in solution. The rate constants for the smaller amines in solution (m.w. < 100) cannot be correlated using only the ionization potentials, and steric effects are likely to be of importance.
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