Plant Qrowth'Suhstances 



REFERENCES 



Synthesis of Vitamin B^ 



(Earlier references can be derived from these papers) 



Cline, J. K., Williams, R. R., Finkelstein, J., and others 

 (1937), ^oMrn. Amer. Chem. Soc, 58, 216 (first note), 526, 

 530 and 1052 — especially 1052. 



Todd, A. R., and Bergel, F. (1937), Journ. Chem. Soc, 364. 



Andersag, H., and Westphal, K. (1937), Ber., 70, 2035. 



Vitamin C 



The story of its isolation by Szent-Gyorgyi in 1928 is 

 sufficiently well-known to those interested. The substance is 

 widely known as ascorbic acid and by other names. It was 

 synthetized by Swiss and British workers in 1933, and was the 

 first vitamin to be synthetized. 



Its formula is : 



,0. 



OH-CH — HC^ ^CO 



I \ / 



OH-CH2 c c 



HO OH 



vitamin C 



Vitamin B^ 



This, like nicotinic acid and other substances, is sometimes 

 useful in culture of excised roots (see White, above). It is 

 mentioned for the sake of completeness. 



REFERENCES H 



It is believed that most modern work on the chemistry of 

 indole-acetic acid and higher growth-substances can be 

 obtained at first or second hand from the following lists. For 



116 



