Complexes of pyridine and quinoline N-oxides with boron trifluoride: the 1H NMR study

Abstract

The formation of complexes of pyridine and quinoline N-oxides with BF3 was studied by 1H NMR method. It was shown that the molecular complexes obtained are either individual isomers or a mixture of stereoisomers, whose structures are determined by both electronic and steric properties of substituents in a heterocycle. The type of hybridization (sp3 or sp2) of the O atom of the N-oxide group in the above adducts was assumed to be specified also by the above factors.