Pd-Catalyzed C–H arylation of pyridazine-based fused 1,2,4-triazoles: overriding selectivity at the usual position by undermining of preferred chelate formation

2017 ◽  
Vol 53 (85) ◽  
pp. 11709-11712 ◽  
Author(s):  
Ramasamy Srinivasan ◽  
Aniruddha Dey ◽  
N. Shanmugam Nagarajan ◽  
Rajendran Senthil Kumaran ◽  
Thirumanavelan Gandhi ◽  
...  
Keyword(s):  
Chelate Formation ◽  
Usual Position

Palladium(ii) catalyzed regioselective mono-arylation in heterocycles containing multiple Lewis basic N-donor sites. Novelty of the protocol lies in overriding formation of chelation assisted palladacycles.

Chelated fluoroboron cations. III. Spectroscopic evidence for ring size and steric limitations to chelate formation by amine chelating donors

2001 ◽  
Vol 79 (4) ◽  
pp. 426-436 ◽  
Author(s):  
J Stephen Hartman ◽  
James AW Shoemaker
Keyword(s):  
Mass Spectrometry ◽  
Nmr Spectroscopy ◽  
Fast Atom Bombardment ◽  
Ring Size ◽  
Chelating Ligands ◽  
Factors Affecting ◽  
Spectroscopic Evidence ◽  
Chelate Formation ◽  
Amine Ligands ◽  
Chelate Rings

Factors affecting the ability of potentially chelating amine ligands to form chelated fluoroboron cations are explored by 19F and 11B NMR spectroscopy and fast atom bombardment mass spectrometry (FAB-MS). Five-membered chelate rings form much more readily than six-membered. Some potentially chelating ligands give rise to additional fluoroboron species by various redistribution and decomposition reactions.Key words: chelated fluoroboron cations, 19F NMR, 11B NMR; FAB-MS, N,N,N',N'-tetraethylethylenediamine.

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