Working with generic structures

All these molecules are built up using two aromatic amines in different ways one to be diazotized and coupled, traditionally called the diazo base, and one to be condensed with the carboxylic acid function, traditionally called the condensation base. An enormous variety of compounds of the above generic structures has been synthesized since their first discovery. While Chemical Abstracts only lists some 550 CA Registry Numbers, the actual number of compounds synthesized by far exceeds 10000, with most of the work carried out in industrial laboratories. ... 

In his M.D. thesis, presented in 1861, Cntm Brown drew structures of molecules that are remarkably like the modem formitlas 58), with the exception that he drew the symbol of each element inside a circle (remirriscent of Dalton s symbolism), and he drew double bonds with bent lines, rather than straight lines, as shown in Figure 7, for succinic acid. He followed this work up with a paper entitled, "On the classification of chemical substances by meatrs of generic radicals" (5P). 

---