An undecacyclic carbon-centered hydrocarbon radical: synthesis and investigation

• Ali S. Acan,
• Johannes Werner and
• Joachim Podlech

Beilstein J. Org. Chem. 2026, 22, 1196–1204, doi:10.3762/bjoc.22.95

• attributable to the extremely short excited-state lifetimes reported for indenofluorenes, likely caused by rapid non-radiative decay via conical intersection [52]. Obviously, an aromatic or antiaromatic character is an outstanding feature of a fully conjugated cyclic or polycyclic system. Especially an

Recent advances and future challenges in the bottom-up synthesis of azulene-embedded nanographenes

• Bartłomiej Pigulski

Beilstein J. Org. Chem. 2025, 21, 1272–1305, doi:10.3762/bjoc.21.99

• azulene-embedded PAHs. This approach requires a halogen-functionalized precursor and typically employs a palladium catalyst. Dou and co-workers reported a last-stage intramolecular C–H arylation of substituted indenofluorenes 61 and 62 (Scheme 10) [57]. The palladium-catalysed reaction yielded fused

• regarded as extended indenofluorenes that contain only “formal azulene” subunits rather than exhibiting true azulene-like electronic properties. Zhang and co-workers reported the synthesis C84 molecular carbon 66, which contains 10 non-benzenoid rings including four “formal azulene” units (Scheme 10) [58

Scalable synthesis of 5,11-diethynylated indeno[1,2-b]fluorene-6,12-diones and exploration of their solid state packing

• Bradley D. Rose,
• Peter J. Santa Maria,
• Aaron G. Fix,
• Chris L. Vonnegut,
• Lev N. Zakharov,
• Sean R. Parkin and
• Michael M. Haley

Beilstein J. Org. Chem. 2014, 10, 2122–2130, doi:10.3762/bjoc.10.219

• gram amounts of material. With this new methodology, we explored the effects on crystal packing morphology for the indeno[1,2-b]fluorene-6,12-diones by varying the substituents on the silylethynyl groups. Keywords: crystal packing; electron accepting; indenofluorenes; organic electronics; polycyclic