| 
Leeper Group | ||||
|   |  |||||
   
 |  
   
 |  
      |  
      |  
      |  
|
      |  ||||||
| 
 Abstract 05  Treatment of 4-methoxy-a-pyrones with butyllithium or lithium di-isopropylaniide causes rapid deprotonation at C(3) of the pyrone ring to give nioderately stable vinylic carbanions. 
 
  | 
||||||
      |  ||||||