title: Crystal clear structural evidence for electron delocalization in 1,2-dihydro-1,2-azaborines.
abstract: The first examples of "pre-aromatic" 1,2-dihydro-1,2-azaborine heterocycles have been structurally characterized, enabling the direct comparison of delocalized bonds of 1,2-dihydro-1,2-azaborines to their corresponding formal double and single bonds in nonaromatic systems. The crystallographic data provide an unprecedented look into the structural changes that occur in six-membered BN-heterocycles on their road to aromaticity, and they establish with little ambiguity that 1,2-dihydro-1,2-azaborines possess delocalized structures consistent with aromaticity.
authors.affiliation: Department of Chemistry, University of Oregon, Eugene, Oregon 97403, USA.
authors.forename: Eric R
authors.initials: ER
authors.lastname: Abbey
authors.forename: Lev N
authors.initials: LN
authors.lastname: Zakharov
authors.forename: Shih-Yuan
authors.initials: SY
authors.lastname: Liu
mesh_terms: D001372:Aza Compounds / Q000737:chemistry*; D001896:Boron Compounds / Q000737:chemistry*; D004583:Electrons; D006571:Heterocyclic Compounds / Q000737:chemistry*
chemical_list: D001372:Aza Compounds; D001896:Boron Compounds; D006571:Heterocyclic Compounds