Carbon–nitrogen bond dissociation energy values in C‐nitrosocompounds

Measurements of the D(RNO) bond strength in some C‐nitrosocompounds have been made using an electron impact method. The appearance potential of the radical ion (R+) has been determined, the D(RNO) bond energy being obtained from the relation The values obtained are: D(C6H5NO) = 41 kcal/mole, D(t‐C4H9NO) = 34 kcal/mole, D(t‐C5H11NO) = 36 kcal/mole and D(i‐C3H7NO) = 36.5 kcal/mole. These values are in good agreement with the numerous estimations of Benson and coworkers and confirm that the CN bond strength in C‐nitrosocompounds is very much less than in nitrocompounds or in amines.