Make it Double: [4]Cumulene Thermal Core Transformation and Chemical Reduction.

ABSTRACT: Heating of [4]cumulene 1 at 235 °C in vacuo affords the head-to-head [4]radialene dimer 2, which subsequently sublimes to produce single crystals. Reduction of 2 with Cs produced a ring-opened cumulene dimer dianion (2_TR^2-) crystallized as [Cs⁺(18-crown-6)₂][Cs⁺(2_TR^2-)]·C₆H₁₄ (3). X-ray diffraction analysis revealed an unusual core transformation during the 2-fold reduction, with increased bond length alternation resembling an alkyne. Moreover, oxidation of 2_TR^2- regenerated 1, demonstrating reversible cumulene-radialene interconversion.

SUBMITTER: Zhou Z 

PROVIDER: S-EPMC12501943 | biostudies-literature | 2025 Oct

REPOSITORIES: biostudies-literature