THE PLANT BASES 



161 



CH CH 



CHo CH 2 

 II 



CH CH CH 2 CH 2 



V XV 



NH NH 



Pyrrole Pyrrolidine 



These alkaloids form a small group containing : 



Hygrine and euskhygrine which occur in Coca leaves (Eryihroxylon 

 Coca). 



Stachydrine which occurs in tubers of Stocky s tuverifera and leaves 

 of the Orange Tree (Citrus Aurantium) and in various other plants 



(Betonica). The formula is : 



CH 2 CH 2 



I ' I 

 CO CH ^ CH, 



\/ 



-N(CH 3 ) 2 



from which it is seen that it is really a betaine (see p. 157). 



3. The tropane alkaloids. 



These are derivatives of tropane, which may be regarded as formed 

 from condensed piperidine and pyrrolidine groupings. (Tropane is a 

 liquid boiling at 167 J C.) 



CH 2 



/ \ 

 CH 2 CH 2 



I 1 



CH CH 



\/ 



NCH 3 



Tropane 



The alkaloids in this group are limited to four natural orders and 

 are as follows : 



Solanaceae : Atropine occurs in the root and other parts of the 

 Deadly Nightshade (Atropa Belladonna), the Thorn Apple (Datura 

 Stramonium) and Scopolia japonica. Atropine may be represented as : 

 CH O CO CH CHoOH 



/ \ I 



CH 2 CH, C 6 H 5 



i I ' 



CH CH 



NCH 3 

 CH 2 CH 2 



O. 



11 



