Abstract
The spatial configuration of benzoquinuclidine (I) is such as to justify on theoretical grounds the assumption that the mesomeric interaction between the amino group and the benzene ring is at a minimum. The experimental work reported here proves that this interaction is in fact essentially zero, and hence that, in general, elimination of mesomerism by steric factors is possible. This result was obtained by a study of ultraviolet absorption spectra and of the ability to couple with diazonium compounds.