Abstract
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 its
aromatic
azo-analogue,
i
.
e
., ω-azotoluene. According to Thiele,* when the latter substance is heated
in vacuo
, gas liberation begins at 15°-180° C. C
6
H
5
. CH
2
─ N = N ─ CH
2
. C
6
H
5
= N
2
+ C
6
H
5
. CH
2
. CH
2
. C
6
H
5
. This reaction is analogous to the benzalazine decomposition (measured at 318°- 180° C), C
6
H
5
. CH = N ─ N = CH. C
6
H
5
= N
2
+ C
6
H
5
. CH = CH. C
6
H
5
, 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.
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