title: Azulenylcarbenes: Rearrangements on the C11 H8 Potential Energy Surface.
abstract: Four isomeric azulenylcarbenes were synthesized in argon matrices by photolysis of the corresponding diazo precursors, and the photochemistry of these carbenes was studied. The carbenes and their rearranged products were characterized by IR, UV/Vis, and EPR spectroscopy, and the experimental data were compared to results from DFT calculations. While 2-, 5- and 6-azulenylcarbene show triplet ground states, 1-azulenylcarbene exhibits a singlet ground state, in accord with theoretical predictions. The rearrangements of the azulenylcarbenes give access to a number of unusual C11 H8 isomers, such as other carbenes and strained allenes.
authors.affiliation: Lehrstuhl für Organische Chemie II, Ruhr-Universität Bochum, 44780, Bochum, Germany.
authors.forename: Stefan
authors.initials: S
authors.lastname: Henkel
authors.affiliation: Lehrstuhl für Organische Chemie II, Ruhr-Universität Bochum, 44780, Bochum, Germany.
authors.forename: Corina H
authors.initials: CH
authors.lastname: Pollok
authors.affiliation: Lehrstuhl für Organische Chemie II, Ruhr-Universität Bochum, 44780, Bochum, Germany.
authors.forename: Tim
authors.initials: T
authors.lastname: Schleif
authors.affiliation: Lehrstuhl für Organische Chemie II, Ruhr-Universität Bochum, 44780, Bochum, Germany. wolfram.sander@rub.de.
authors.forename: Wolfram
authors.initials: W
authors.lastname: Sander
keywords: IR spectroscopy; carbenes; matrix isolation; photochemistry; photolysis