Reflecting on synthetic pinnacles: Whereas the parent hydrocarbon is not readily accessible, several examples of BN substituted-dibenzo[a,o]picenes can be prepared in two steps from known starting materials. These non-linear heptacene analogues are water-stable materials. Their preparation utilizes a potentially general method for preparing extended BN analogues of difficult-to-synthesize polycyclic aromatic hydrocarbon frameworks.
Climbing the ladder: Reductive cyclization of alkynyl haloboranes lead to the bis-benzocycloborabutylidene rather than the expected ladder diborole, despite the former being much less thermodynamically favored. Photochemical conversion to the ladder diborole was, however, quite facile upon irradiation at 254 nm.
Neue Farben: Über drei verwandte Fluoreszenzfarbstoffklassen, die durch eine Bordifluorid‐Gruppe starr sind und aus zweizähnigen Anilidopyridylliganden bestehen (siehe Bild), wird berichtet. Die Farbstoffe zeigen Quantenausbeuten bis 0.75 und eine mehr als 100 nm stärkere Stokes‐Verschiebung als die BODIPY‐Farbstoffe. Zudem sind sie außergewöhnlich photostabil und membranspezifisch.
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.