Nuclear magnetic resonance studies on .sigma.-adducts of heterocyclic systems with nucleophiles. 18. Proton and carbon-13 nuclear magnetic resonance investigations on .sigma.-adduct formation between 1,X-naphthyridines and some methyl-1,8-naphthyridines with potassium amide in liquid ammonia

1978 ◽  
Vol 43 (9) ◽  
pp. 1673-1677 ◽  
Author(s):  
H. C. Van der Plas ◽  
A. Van Veldhuizen ◽  
M. Wozniak ◽  
P. Smit
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