7,7-Dipyridyl-2,6-di-tert-butyl-p-quinone Methides: Synthesis, Complexation with Silver(I) Ion, and Oxidation to Their Pyridine N-Oxide

A series of 7,7-dipyridyl-p-quinone methides are prepared from the corresponding dipyridylketones with 4-lithio-2,6-di-tert-butylphenoxide followed by dehydration. 7,7-Bis(2-pyridyl)-p-quinone methide formed the binuclear Ag(I) complex in which the quinone methide rings are deformed to the boat form. Oxidation of 7,7-dipyridyl-p-quinone methides gave the corresponding bis(pyridine N-oxide)s.

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