title: Regioselective Photoisomerization/C-C Bond Formation of Asymmetric B(ppy)(Mes)(Ar): The Role of the Aryl Groups on Boron.
abstract: Asymmetric N,C-chelate organoboron compounds bearing two different aryl groups at the boron center undergo photoisomerization reactions that involve exclusively the less bulky aryl group, generating various strongly colored "dark isomers". These species thermally isomerize to 4bH-azaborepin molecules by direct hydrogen atom transfer from a borirane cycle to the pyridyl moiety and ring expansion. Mechanistic insight into these highly regioselective transformations was obtained from kinetic data and through computational studies.
authors.affiliation: Department of Chemistry, Queen's University, Kingston, Ontario, K7L 3N6, Canada.
authors.forename: Soren K
authors.initials: SK
authors.lastname: Mellerup
authors.affiliation: Department of Chemistry, Queen's University, Kingston, Ontario, K7L 3N6, Canada.
authors.forename: Cally
authors.initials: C
authors.lastname: Li
authors.affiliation: Beijing Key Laboratory of Photoelectronic/Electrophotonic Conversion Materials, School of Chemistry, Beijing Institute of Technology, 5 South Zhongguancun Street, Beijing, P.R. China.
authors.forename: Tai
authors.initials: T
authors.lastname: Peng
authors.affiliation: Department of Chemistry, Queen's University, Kingston, Ontario, K7L 3N6, Canada.|Beijing Key Laboratory of Photoelectronic/Electrophotonic Conversion Materials, School of Chemistry, Beijing Institute of Technology, 5 South Zhongguancun Street, Beijing, P.R. China.
authors.forename: Suning
authors.identifier: 0000-0003-0889-251X
authors.initials: S
authors.lastname: Wang
keywords: 4bH-azaborepins; C−C bond formation; boriranes; photo-/thermal transformations; regioselectivity