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- W2898038662 abstract "A π-expanded helicene that is the helically twisted analogue of kekulene was synthesized using a 6-fold ring-closing olefin metathesis (RCM) reaction as a key step. The π-expanded geometry with large helical diameter ( dh = 10.2 Å), consisting only of carbon and hydrogen atoms (C54H30), was unambiguously determined by single-crystal X-ray analysis. We found that the π-expanded helicene with large helical diameter will act as a soft molecular spring with a small spring constant. Interestingly, the mechanical properties of the molecular springs roughly satisfied a physical formula for macroscopic spring materials; i.e., the force constant of the elongation of a molecular spring ( k) is inversely proportional to the third power of the helical diameter ( k ∝ dh-3)." @default.
- W2898038662 created "2018-10-26" @default.
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- W2898038662 date "2018-10-19" @default.
- W2898038662 modified "2023-10-17" @default.
- W2898038662 title "Synthesis of a Helical Analogue of Kekulene: A Flexible π-Expanded Helicene with Large Helical Diameter Acting as a Soft Molecular Spring" @default.
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- W2898038662 doi "https://doi.org/10.1021/jacs.8b09825" @default.
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