title: Pd-catalyzed [2+2+1] coupling of alkynes and arenes: phenol diazonium salts as mechanistic trapdoors.
abstract: Alkynes and phenol diazonium salts undergo a Pd-catalyzed [2+2+1] cyclization reaction to spiro[4,5]decatetraene-7-ones. This structure was confirmed for one example by X-ray single-crystal structure analysis. The reaction is believed to proceed through oxidative addition of the phenol diazonium cation to Pd(0), subsequent insertion of two alkynes, followed by irreversible spirocyclization.
authors.affiliation: Institut für Chemie, Universität Potsdam, Karl-Liebknecht-Straße 24-25, 14476 Golm, Germany. bernd.schmidt@uni-potsdam.de
authors.forename: Bernd
authors.initials: B
authors.lastname: Schmidt
authors.forename: René
authors.initials: R
authors.lastname: Berger
authors.forename: Alexandra
authors.initials: A
authors.lastname: Kelling
authors.forename: Uwe
authors.initials: U
authors.lastname: Schilde