Treatment of the imine PhC(![[double bond, length as m-dash]](http://www.rsc.org/images/entities/char_e001.gif)
NSiMe3)py with Et2BOMe or BF3·Et2O afforded bicyclic ketiminoboranes 4a and 4bvia intramolecular N-coordination. The basicity of the imine N is evidenced by their reactivity towards Brønsted and Lewis acids and the structures of 4a·HCl and 4b·BF3 are reported as well as the dipyridyl imine derivative 4c·HCl.
