title: Pi-electron conjugation effects in antiaromatic dehydro[12]- and aromatic dehydro[18]-annulenes.
abstract: N,N-Dimethylanilino-substituted perethynylated dehydro[12]- and dehydro[18]-annulenes were prepared by oxidative acetylenic coupling of cis-bisdeprotected tetraethynylethene derivatives obtained by a new photochemical route; they display strongly bathochromically shifted longest-wavelength absorption bands compared to their silyl-substituted counterparts resulting from efficient intramolecular charge-transfer between the peripheral pi-electron donors and the electron-accepting central acetylenic core.
authors.affiliation: Laboratorium für Organische Chemie, ETH-Hönggerberg, CH-8093, Zürich, Switzerland.
authors.forename: Frieder
authors.initials: F
authors.lastname: Mitzel
authors.forename: Corinne
authors.initials: C
authors.lastname: Boudon
authors.forename: Jean-Paul
authors.initials: JP
authors.lastname: Gisselbrecht
authors.forename: Maurice
authors.initials: M
authors.lastname: Gross
authors.forename: François
authors.initials: F
authors.lastname: Diederich