DEVELOPERS AND THEORY OF DEVELOPMENT 



325 



HN 



/ 



H2 H2 

 C— C 



NH Piperazine 



C— C 



H2 H2 



which yield the following developers : 



OH p-Hydroxy-N-phenyl morpholine 



N- 



N— 



> 



OH p-Hydroxy-N-phenyl piperidine 



OH p-Hydroxy-N-phenyl piperazine 



With aniline, the corresponding p-amino-N-phenyl substitution products are 

 formed, viz., 



O 



H2 H2 



c— c 



c— c 



H2 Hs 



N— 



NH2 p-Amino-N-phenyl morpholine, etc. 



Instead of benzene as the nuclear ring, the naphthalene or double ring 



may also be used as the basic nuclevis, substitution into which yields another large 

 class of developing agents. 



As in the case of the benzene series, two hydrogen atoms must be substituted for 

 by either hydroxyl or amino groups to make the substituted derivative a developing 

 agent. Thus 



OH 



a-naphthol 



