title: Self-addition of a sterically hindered alkynylselenolate.
abstract: [structure: see text] The unprecedented formation of a complex macrocyclic selenium-carbon ring system, which is initiated by the action of coordinating reagents upon a sterically hindered alkynylselenolate, has been observed. The crystal structure of the product could be obtained and shows a rigid tricyclic arrangement consisting only of selenium and sp(2)-hybridized carbon atoms. This reactivity stands in contrast to the corresponding unsubstituted alkynylselenolates and is an example where a bulky substituent destabilizes an adjacent unsaturated pi-system.
authors.affiliation: Institut für Chemie, Universität Graz, Schubertstrasse 1, A-8010 Graz, Austria. rudolf.pietschnig@uni-graz.at
authors.forename: Rudolf
authors.initials: R
authors.lastname: Pietschnig
authors.forename: Sven
authors.initials: S
authors.lastname: Schäfer
authors.forename: Klaus
authors.initials: K
authors.lastname: Merz