title: A stable dialkylphosphinyl radical.
abstract: Dialkylphosphinyl radical 1 was synthesized as thermally stable yellow crystals and found to be monomeric both in solution and in the solid state. EPR spectrum showed that the spin density of 1 is mainly localized on the 3p orbital of the dicoordinated phosphorus atom. A distinct absorption band due to the electronic transition from nonbonding electron pair orbital to singly occupied 3p orbital on the phosphorus atom of 1 was observed at 445 nm in solution. Phosphinyl radical 1 underwent facile reaction with carbon tetrachloride, hydrogen abstraction, and a unique reaction with a persistent radical, galvinoxyl, giving a cyclic phosphaalkene and a silylether.
authors.affiliation: Department of Chemistry, Graduate School of Science, Tohoku University, Aoba-ku, Sendai 980-8578, Japan. sishida@m.tohoku.ac.jp
authors.forename: Shintaro
authors.initials: S
authors.lastname: Ishida
authors.forename: Fumiya
authors.initials: F
authors.lastname: Hirakawa
authors.forename: Takeaki
authors.initials: T
authors.lastname: Iwamoto