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- W2022277780 abstract "A series of hexadehydro[18]annulenes fused with different numbers of p-benzoquinone, 4-6, were synthesized by stepwise transformation of the p-dimethoxybenzene moiety of the precursor dehydroannulene 3 fused with three 3,6-dimethoxy-4,5-dimethylbenzene units at 1,2-positions into p-benzoquinone using ceric ammonium nitrate. The UV–vis spectra of compounds 4 and 5, which have both electron-donating p-dimethoxybenzene unit(s) and electron-accepting p-benzoquinone unit(s) in the π-systems, showed the maximum absorption bands bathochromically shifted in comparison with 3 having only p-dimethoxybenzene units and 6 having only p-benzoquinone units. However, the solvatochromism expected for 4 and 5 was found to be quite weak possibly because the HOMO and LUMO (B3LYP/6-31G(d)) are not localized but rather delocalized over the whole π-systems." @default.
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- W2022277780 date "2004-04-01" @default.
- W2022277780 modified "2023-10-16" @default.
- W2022277780 title "Synthesis and properties of p-benzoquinone-fused hexadehydro[18]annulenes" @default.
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- W2022277780 doi "https://doi.org/10.1016/j.tet.2004.02.041" @default.
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