Zur diamagnetischen Anisotropie im 2.2Metacyclophan

摘要

In order to furnish a reliable interpretation of the1H-NMR spectrum of 2.2metacyclophane (1) based on the ring current theory two basic conditions must be fullfilled:1.Bond lengths angle deformations due to the puckered topology of the molecule must be taken into account. The geometry parameters can be deduced fromX-ray data.2.The (fictive) reference chemical shift of the system (i.e. unperturbed by the “second” benzene ring) must be established since the Δ δ's ofBovey'sring current formula have to be related to a refe