title: Fourfold Diels-Alder reaction of tetraethynylsilane.
abstract: A series of ethynylated silanes, including tetraethynylsilane, was treated with tetraphenylcyclopentadienone at 300 °C under microwave irradiation to give the aromatized Diels-Alder adducts as sterically encumbered mini-dendrimers with up to 20 benzene rings. The sterically most congested adducts display red-shifted emission through intramolecular π-π interactions in the excited state.
authors.affiliation: Organisch-Chemisches Institut, Ruprecht-Karls-Universität Heidelberg, Im Neuenheimer Feld 270, 69120 Heidelberg (Germany), Fax: (+49) 6221-54-8401.
authors.forename: Florian L
authors.initials: FL
authors.lastname: Geyer
authors.forename: Alexander
authors.initials: A
authors.lastname: Rode
authors.forename: Uwe H F
authors.initials: UH
authors.lastname: Bunz
keywords: Diels-Alder reaction; dendrimer; ethynyl; oligophenyl; silane