Since there was no information in regard to the reversibility of the azohydrazo system when this work was started, we investigated the potential of the azobenzenedisulfonate-- hydrazobenzenedisulfonate3 system and obtained satisfactory evidence of the reversibility. Biilmann's study of the potential of two different amino derivatives of azobenzene appeared when our work was nearly complete and afforded still more convincing evidence of the ...
![4-[2-(3-chloro-4-oxocyclohexa-2,5-dien-1-ylidene)hydrazinyl]benzenesulfonic acid Structure](https://image.chemsrc.com/caspic/298/50573-58-5.png)