CHARLES A. WEST 



University of California 



The Chemistry of GibberelUns From. 



Flowering Plants' 



The chemistry of the gibberellins derived from culture filtrates of 

 the fungus Gibberella fujikuroi has been extensively investigated 

 primarily by two groups of chemists — one at the College of Agricul- 

 ture of the University of Tokyo and the other at the Akers Research 

 Laboratories of the Imperial Chemical Industries, Limited in Eng- 

 land. The results of the investigations of Grove et al. of the Akers 

 research group have led to the following proposed structures for gib- 

 berellic acid (A3) (2) and gibberellin Ai (Aj) (3). 2 



-^ 



COOH 



OH 



tCH. 



COOH 



^This research was supported in part by grants from the National Science 

 Foundation (G-3526) and Merck & Co., Inc. 



^ After the preparation of this manuscript, the author was informed of a re- 

 port to be published by B. E. Cross, J. F. Grove, J. MacMillan, J. S. Moffatt, T. P. C. 

 Mulholland, and J. C. Seaton in which the proposed structure of gibberellic acid 

 is revised to the following: 



COOH 



[473] 



