Chemistry Letters, Vol.35, No.1, 74-75, 2006
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-2,6di-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.