1889.] 



Chemistry of the Camphoric Acids. 



11 



CHo 

 /\ 



CHo CH-CHo. 



I ' I >oo 



CHo CH-CH/ 



\/ 

 CH-CH, 



and camphoric acid by the formula- 



CH 2 



I I 



CHo CH-COOH 



\/ 

 CH-CH, 



(The asymmetric carbon-atoms are in italics). 



Now the ordinary camphoric acid being the maleinoid acid has the 

 two groups (COOH) and (CHo'COOH) on the same side of the ring- 

 plane of the six carbon-atom nucleus. Hence in camphor, as we 



should naturally have supposed, the grouping, QOKqjj » *■ a ^ 



attached on one side of and not across the ring plane — 



so 



H CH 2 



/ 



C,H, 



(dextro- and lcevo-camphor). 



\ 



H CHo 



\ 

 CO 



/ 



C 5 H, 



H CHoCOOH 



\/ 

 C 



/ 



\ 



c 



/\ 



H COOH 



(dextro- and lasvo-ciscamphoric acid). 



Again the laevo-fumaroid acid has the carboxyl and (CH 2 COOH) 

 groups on opposite sides of the ring plane. 



