title: Regioselective solvent-dependent benzannulation of conjugated enynes.
abstract: The transformation of enynes under cobalt-catalysis leads to symmetrical benzannulation products in dichloromethane. In tetrahydrofuran the cobalt-catalysed reactions afforded the unprecedented unsymmetrical benzannulation products in moderate to good yields and good regioselectivities. In addition, cyclotrimerisation of the alkyne subunit can be realised when electron-deficient enynes are applied in the cobalt-catalysed transformations to generate 1,2,4-trivinylbenzene derivatives using tetrahydrofuran as solvent.
authors.affiliation: Fachbereich Chemie, Hans-Meerwein-Str., 35043 Marburg, Germany.
authors.forename: Florian
authors.initials: F
authors.lastname: Pünner
authors.forename: Gerhard
authors.initials: G
authors.lastname: Hilt