Beilstein J. Org. Chem.2026,22, 803–812, doi:10.3762/bjoc.22.62
with ketones resulted in unique di(pyridin-2-yl)methylene)-9H-diazafluorenes being electron-deficient ligands and functional materials.
Keywords: acidic conditions; diazafluorene; diazafluorenylidene; Knoevenagel condensation; protonation; Introduction
Diazafluorenylidene derivatives were reported to
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Graphical Abstract
Scheme 1:
Knoevenagel reaction of 1 and 2 under basic conditions.