The electronic “umpolung” of the title compound 1 to the dianion 2 is achieved by the uptake of four electrons from potassium in THF. Although the ring skeleton of the 18π 1 deviates significantly from planarity because of the streric requirements of the four selenium atoms, the new macrocycle fulfils the NMR criteria for aromaticity.
Die „elektronische Umpolung”︁ der Titelverbindung 1 zum Dianion 2 gelingt durch Aufnahme von vier Elektronen bei der Einwirkung von Kalium in THF. Obwohl das Ringgerüst des 18π‐Dikations 1 wegen des Raumbedarfs der vier Selenatome beträchtlich von der Planarität abweicht, erfüllt der neue Makrocyclus das NMR‐Kriterium für Aromatizität.magnified image
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.