Ar. Katritzky et al., BASICITIES AND TAUTOMERISM OF SUBSTITUTED METHANO-BRIDGED AZA[10]ANNULENES - 10-PI-ANALOGS OF PYRIDINE, Heterocycles, 36(11), 1993, pp. 2483-2488
pKa values of substituted 2,7-methanoaza[10]annulenes are measured and
compared with similarly substituted pyridines. The tautomerism of 2-a
zabicyclo-[4,4,1]undeca-4,6,8,10-tetraen-3-one is discussed.