urbaf2

NITRO DERIVATIVES OF AZO- AND HYDRAZO-BENZENES 577

VII

m. p. 185°C

It is interesting to note that the two azoxybenzene rings differ in their readiness

to be nitrated. Angeli [14] was the first to draw attention to this fact. From it he

inferred that the azoxy group has an unsymmetrical structure: -N=N-. This

opinion was confirmed later by several authors (e.g. G. M. Robinson [15] ; Behr

[16]; T. Urbanski and J. Urbanski [17]).

Among other higher nitrated azoxybenzene derivatives the following chloro-,

phenol-, methoxy- and methylamine derivatives were recently obtained by T. Urban-

ski and J. Urbanski [17] :

m. p. 226-228°C

m. p. 214-217°C

m. p. 191-192°C

m. p. 198-201°C

m. p. 186487°C

m. p. 239-240°C

m. p. 260-261°C (decomposition)