); the higher value of 121.4 for the dehomologous 7b suggests a departure from planarity, while the value of ca. 129 ppm for 7a indicates significant disruption of resonance (cf. 127.0 ppm for benzoquinuclidine 3, which features a completely orthogonal lone pair). As expected, the value for the relevant carbon in the benzodiazacenecontaining 7e (119.2 ppm) indicates strong lone pair overlap.