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The energy of activation found for the benzalazine decomposition is somewhat higher than those hitherto recorded for the decompositions of azo-compounds. The difference between the azine- and azo-decompositions can only be appreciated, however, on comparing the decomposition of benzalazine with that of itsaromatic azo-analogue,i .e ., ω-azotoluene. According to Thiele,* when the latter substance is heatedin vacuo , gas liberation begins at 15°-180° C. C6 H5 . CH2 ─ N = N ─ CH2 . C6 H5 = N2 + C6 H5 . CH2 . CH2 . C6 H5 . This reaction is analogous to the benzalazine decomposition (measured at 318°- 180° C), C6 H5 . CH = N ─ N = CH. C6 H5 = N2 + C6 H5 . CH = CH. C6 H5 , and resembles the aliphatic azo-decompositions investigated by Rams-perger over the temperature range 250° - 350° C, though occurring at a lower temperature than these.

The rupture of carbon-nitrogen bonds. Kinetics of the thermal decomposition of ω-azotoluene vapour