Bidentate boron Lewis acids based on 1,8‐diethynylanthracene were synthesised in two steps by initial stannylation of the terminal alkynes and subsequent tin–boron exchange with different chloroboranes. The reactions were very selective, and the target compounds were obtained in high purity and good to excellent yields. Complexation experiments of 1,8‐bis[(diphenylboranyl)ethynyl]anthracene with nitrogen bases (pyridine, pyrimidine, TMEDA) afforded three stable adducts, which were structurally characterised by X‐ray diffraction. Competition experiments demonstrated the selective exchange of guests, and quantum‐chemical calculations provided information on their energetics. NMR experiments at low temperature gave insight into the dynamic behaviour of the TMEDA adduct.
Room temperature ionic liquids of cyclic sulfonimide anions ncPFSI (ring size: n = 4–6) with the cations [EMIm]+, [BMIm]+ and [BMPL]+ have been synthesized. Their solid-state structures have been elucidated...
Zweizähnige Bor-Lewis-Säuren wurden ausgehend von 1,8-Diethinylanthracen in zwei Schritten synthetisiert. Dazu wurden die endständigen Alkine zunächst stannyliert und anschließend Zinn-Bor-Austauschreaktionen mit verschiedenen Chlorboranen durchgeführt. Die Reaktionen liefern einen sehr selektiven Zugang zu den Zielverbindungen in hoher Reinheit und mit guten bis sehr guten Ausbeuten. Komplexierungsexperimentev on 1,8-Bis[(diphenylboranyl)ethinyl]anthracen mit Stickstoffbasen (Pyridin, Pyrimidin, TMEDA) führen zur Bildung stabiler Addukte,d eren Strukturen mithilfe von Rçntgenbeugung ermittelt wurden.K onkurrenzreaktionen belegen den selektiven Austauschd er Gastmoleküle und quantenchemische Rechnungen liefern Informationen zu ihrer Energetik. Einblicke in das dynamische Verhalten des TMEDA-Addukts ergaben sich aus Tieftemperatur-NMR-Experimenten.
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