title: Stable heterocyclopentane-1,3-diyls.
abstract: Diphosphadiazanediyl, [(μ-NR)P]2 (R=Ter=2,6-dimesitylphenyl), is known to readily activate small molecules with multiple bonds. CO is an especially intriguing species for activation, because either 1,1- or 1,2-bridging mode would lead to a [1.1.1]bicycle or a carbene, respectively. The activation of CO with diphosphadiazanediyl already occurs at ambient temperatures (1 bar, 25 °C). However, CO is involved in an unprecedented ring expansion reaction under preservation of the biradical character, which leads to the formation of the first stable cyclopentane-1,3-diyl analogue displaying photochromic molecular switch characteristics.
authors.affiliation: Institut für Chemie, Universität Rostock, Albert-Einstein-Strasse 3a, 18059 Rostock (Germany) http://www.schulz.chemie.uni-rostock.de/
authors.forename: Alexander
authors.initials: A
authors.lastname: Hinz
authors.forename: Axel
authors.initials: A
authors.lastname: Schulz
authors.forename: Alexander
authors.initials: A
authors.lastname: Villinger
keywords: activation; biradicaloids; carbon monoxide; phosphorus; radicals