X] 



THE PLANT BASES 



161 



CH— CH CH.,— CH, 



il II \ ' \ ' 



CH CH CH., CH., 



\/ \V 



NH NH 



Pyrrole Pyrrolidine 



These alkaloids form a small group containing: 



Hygrine and cuskhygrine which occur in Coca leaves {Erythroxylon 

 Coca). 



Stachydrine which occurs in tubers of Stachys tuberifera and leaves 

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



{Betonica). The formula is : 



CHo— CH., 



\' \ ' 

 CO— CH CH., 



I \/ 

 O N(CH3), 



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' C.) 



CH„ 



/ \ 

 CH„ CH. 



r I ■ 



CH CH 



NCH; 



CHa— CHg 

 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 • CH.OH 



CH., CH., 



\ ' \ ' 

 CH CH 



\/ 

 NCHs 



CH„ — CH, 



C,H,, 



11 



