title: A Tale of Two Elements: The Lewis Acidity/Basicity Umpolung of Boron and Phosphorus.
abstract: This Minireview focuses on the Lewis acidity/basicity "umpolung" of boron-based nucleophiles and phosphorus-based electrophiles.
authors.affiliation: Department of Chemistry, University of Toronto, 80 St. George St, Toronto, Ontario, M5S3H6, Canada.
authors.forename: Douglas W
authors.identifier: 0000-0001-8140-8355
authors.initials: DW
authors.lastname: Stephan
keywords: Lewis acidity/basicity umpolung; boron nucleophiles; catalysis; electrophilic phosphonium cations; phosphorus Lewis acids