Mechanochemical transformation of planar polyarenes to curved fused-ring systems

Teoh Yong, Gábor Báti, Felipe García () and Mihaiela C. Stuparu ()
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Teoh Yong: School of Physical and Mathematical Sciences, Nanyang Technological University
Gábor Báti: School of Physical and Mathematical Sciences, Nanyang Technological University
Felipe García: School of Physical and Mathematical Sciences, Nanyang Technological University
Mihaiela C. Stuparu: School of Physical and Mathematical Sciences, Nanyang Technological University

Nature Communications, 2021, vol. 12, issue 1, 1-8

Abstract: Abstract The transformation of planar aromatic molecules into π-extended non-planar structures is a challenging task and has not been realized by mechanochemistry before. Here we report that mechanochemical forces can successfully transform a planar polyarene into a curved geometry by creating new C-C bonds along the rim of the molecular structure. In doing so, mechanochemistry does not require inert conditions or organic solvents and provide better yields within shorter reaction times. This is illustrated in a 20-minute synthesis of corannulene, a fragment of fullerene C60, in 66% yield through ball milling of planar tetrabromomethylfluoranthene precursor under ambient conditions. Traditional solution and gas-phase synthetic pathways do not compete with the practicality and efficiency offered by the mechanochemical synthesis, which now opens up a new reaction space for inducing curvature at a molecular level.

Date: 2021
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DOI: 10.1038/s41467-021-25495-6

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