— 144 — J 



nomenclature, therefore, it is unnecessary to begin a fresh notation when 

 the bridge-point changes from 2 to 1. Ring-systems with 2 bridges also, 

 for which up to the present no nomenclature existed, can readily be 

 named by Grignard's system. For instance, tricyclene carboxylic acid 

 (VI) and teresantalic acid (VII) can be described as dimethyl-7,7-tetract/cZo 



Lv -hexane carboxylic acid-1 and dimethyl-l,7-tetraq/cfo- 2 V -hexane 



carboxylic acid-7 respectively. 



HC 



H 2 C 



C-(CH 3 ) 5 



CH 



CH 2 



CH 



4 









4 











4 



(I) 



CH S 

 COH 



(II) 







(ill) 



CH 3 



C 



HC 



<( \cH, 





HO 



HC 



' ^CH, 





\OisC)t 



\c 











c 



::(CHa) 2 





H 2 C 







CH 2 







H 2 C 







CH, 





( 



:h 









C 



:h 





(IV) 









(V) 



I 



3 inene hydrate. 









Borneol. 





COOH 









CH 8 





( 



i 











( 



i 





HC 



H 2 C 



C'CH; 



C0 2 H 



CH 



CH 



CH 2 



(VI) 

 Tricyclenecarboxylic acid. 



(VII) 

 Teresantalic acid. 



