title: Silyl effects on 1,3-diphosphacyclobutane-2,4-diyl: ring-opening of tetrahydrofuran and promotion of reductive P-C cleavage.
abstract: Mind your "P"s: Silylated P-heterocyclic biradicals activated tetrahydrofuran to give the corresponding 4-siloxybutyl-substituted 1,3-diphosphacyclobutane-2,4-diyls via ring-opening of the solvent molecule. Reductive P-C bond cleavage was found as an alternative approach to 1,3-diphosphacyclobuten-4-yl anion. Redox properties of the new P-heterocyclic biradicals were discussed in terms of hitherto unknown substituent effects.
authors.affiliation: Department of Applied Chemistry, Graduate School of Science and Engineering, Tokyo Institute of Technology, 2-12-1, Ookayama, Meguro, Tokyo 152-8552, Japan. ito.s.ao@m.titech.ac.jp
authors.forename: Shigekazu
authors.initials: S
authors.lastname: Ito
authors.forename: Trang Thi Thu
authors.initials: TT
authors.lastname: Ngo
authors.forename: Koichi
authors.initials: K
authors.lastname: Mikami
keywords: bond cleavage; heterocycles; radicals; redox chemistry; ring-opening reactions