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- W4323837821 abstract "We report here the one-pot synthesis of benzo[1,2-a : 3,4-a′ : 5,6-a′′]triazulene (BTA), wherein three azulene units are embedded through a tandem reaction comprising two steps, Suzuki coupling and Knoevenagel condensation, between a readily available triborylated truxene precursor and 8-bromo-1-naphthaldehyde. Its nitration leads to a regioselective trinitrated product, namely, BTA-NO2. Single-crystal X-ray crystallography revealed that the superstructure of BTA consists of a dimer stacked by two enantiomeric helicene conformers, while that of BTA-NO2 consists of an unprecedented π-tetramer stacked from two enantiomeric dimers, that is, four distinct helicene conformers. Both compounds show excellent stability and fluorescence with large Stokes shifts of up to 5100 cm−1. In addition, BTA-NO2 exhibits a unique solvatochromic effect in different solvents and hydrogen-bonding-induced emission transfer in different ratios of THF/H2O solutions." @default.
- W4323837821 created "2023-03-11" @default.
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- W4323837821 date "2023-04-03" @default.
- W4323837821 modified "2023-10-16" @default.
- W4323837821 title "Cascade Synthesis of Benzotriazulene with Three Embedded Azulene Units and Large Stokes Shifts" @default.
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- W4323837821 doi "https://doi.org/10.1002/ange.202218839" @default.
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