An Intramolecular Boron Nitrogen Lewis Acid Base Pair on aRigid Naphthyl Backbone

In the field of polyfunctional Lewis acids [1] the preorganisation of the Lewis acidic sites can be achieved employing rigid backbones. Ortho-substituted benzenes [2], peri-substituted naphthalene [3 – 6] and 1,8substituted anthracene [7, 8] offer promising applications as such backbones in the field of host-guest chemistry [9]. Furthermore, these frameworks can induce unusual interactions between different functionalities. The combination of Lewis acid and base functions fixed to rigid backbones leads to the formation of dative bonds in constrained systems. Examples for such systems include boron nitrogen interactions in 1,8substituted naphthalenes (A) [10] and 1,8,9-substituted